CN111599798A - Blue-green light adjustable LED artificial lighting device - Google Patents

Abstract

The present invention provides a blue-green adjustable LED human factor lighting device, comprising a substrate, an LED light-emitting element group, a bonding wire, a substrate pad, a first enclosure, a phosphor-containing layer, and an electrode, and the LED light-emitting element group includes at least two LED light-emitting elements with different emission peaks, a plurality of control circuits for controlling the input power of the corresponding LED light-emitting elements are arranged on the substrate, the control circuits are connected with the LED light-emitting elements, and the LED light-emitting element groups, substrate pads, and electrodes are arranged on the substrate. On the bottom, the LED light-emitting element and the substrate pad are electrically connected by bonding wires, the electrode is connected to the substrate pad, the phosphor containing layer is coated on the LED light-emitting element, and the first enclosure is arranged on the LED light-emitting element group, the phosphor The periphery of the containing layer wraps the LED light-emitting element group and the phosphor containing layer. The present invention adjusts the intensity of blue and green light by controlling the input power of different light-emitting elements to adapt to different rhythmic lighting requirements of day and night, and helps people to achieve a state of being energetic or relaxing according to their daily life patterns.

Description

Blue-green tunable LED human factor lighting device

technical field

The invention relates to the technical field of light emitting diode packaging, in particular to a blue-green light adjustable LED human factor lighting device.

Background technique

With the advancement of semiconductor lighting technology, LED lighting products have begun to be applied to various traditional lighting fields, and people's requirements for LED lighting have gradually shifted from simple environmental protection and energy saving to the pursuit of health and comfort, that is, to meet the needs of consumers' psychological and physical health. As the goal, the main brand is "healthy lighting". In this process, "human-induced lighting" has been gradually excavated, its corresponding spectrum has also been carefully designed, and the corresponding "human-induced lighting" LED devices have also begun to be introduced to the market.

The concept of human-induced lighting has a long history, but in view of the bottleneck of technology, it has not been able to find cost-effective devices to achieve popularization. Human-induced lighting involves a kind of melatonin in the human body. As shown in Figure 1, melatonin is a sleep hormone and has a strong sensitivity to blue-green wavelengths of light around 480nm. More blue-green light can inhibit the body's production of melatonin, making the body feel more excited and energetic at work. Similarly, lower blue-green light intensities can minimize interference with the body's melatonin, thereby improving sleep quality.

Samsung Electronics, the world's leading semiconductor device solutions provider, recently launched the first "human-centered rhythm lighting" LED device - LM302N. Through a carefully designed spectrum, the LM302N series of products can adjust the ideal level of melatonin indoors, helping people to adapt to their daily life. mode to achieve a state of energy or relaxation. Samsung's LM302N uses a precisely designed spectrum and optimal dose of blue-green light intensity to adapt to the different rhythm lighting needs of day and night. As shown in Figure 2, LM302N-DAY excitation type can inhibit the level of melatonin in the body during the day, and its inhibitory ability More than 18% higher than ordinary LED lighting. Motivational series products, available in different color temperature ranges from 3000K to 6500K, are suitable for a variety of indoor applications such as schools, offices, libraries and industrial sites to enhance human alertness and energy levels. The LM302N-NITE relaxation type can provide suitable brightness without hindering the release of melatonin, helping people maintain ideal hormone levels. Compared with ordinary LED devices, the LM302N-NITE relaxation type makes the human body release 5% more melatonin than usual under light (according to clinical trial data), which increases the relaxation of the human body and helps to regulate sleep. In addition, the LM302N-NITE relaxed color temperature range from 1800K to 4000K, can provide high design flexibility, suitable for a variety of night lighting applications. LM302N DAY Exciting Type and NITE Relaxing Type, both devices can also be combined in one light fixture to help people regulate the body's 24-hour natural circadian rhythm. This dual-channel lighting application will be the best choice for people who spend most of their time indoors to combat the chaotic biological clock.

At present, the "human factor lighting" products on the market are all devices with a single spectrum developed for a certain work or life scene, or two independent devices with different spectrums are combined in one lamp to realize the lighting environment of different scenes. There is no single packaged device that can emit two different spectrums at the same time, and there is no LED human-induced lighting device with adjustable blue and green light. COB is a multi-chip module package. Through the optimized design of the circuit structure, it can be To achieve the need to modulate different blue-green light spectrum.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a blue-green light adjustable LED human factor lighting device, which assembles two LED light-emitting elements with different emission peaks on one substrate, and designs two independent circuits to control different Light-emitting elements that emit wavelengths can adjust the blue-green light intensity by controlling the input power of different light-emitting elements to adapt to the different rhythm lighting needs of day and night, helping people to achieve a state of energy or relaxation according to their daily life patterns.

The present invention provides a blue-green tunable LED human factor lighting device, including a substrate, an LED light-emitting element group, a bonding wire, a substrate pad, a first enclosure, a phosphor-containing layer, and an electrode. The LED light-emitting element group includes At least two kinds of LED light-emitting elements with different emission peaks, the substrate is provided with a plurality of control circuits for controlling the input power of the corresponding LED light-emitting elements, the control circuits are connected with the LED light-emitting elements, and the LED light-emitting element group , the substrate pad and the electrode are arranged on the substrate, the LED light-emitting element and the substrate pad are electrically connected through the bonding wire, and the electrode is connected to the substrate pad connected, the phosphor-containing layer is coated on the LED light-emitting element, the first enclosure is arranged on the periphery of the LED light-emitting element group, the phosphor-containing layer, and wraps the LED light-emitting element group, all The phosphor-containing layer.

Further, the LED light-emitting element group includes a first LED light-emitting element and a second LED light-emitting element; the first LED light-emitting element emits blue light with a light emission peak wavelength of 440nm-460nm, or emits a light emission peak wavelength of 475nm- blue light near 485nm; the second LED light-emitting element emits blue light with a peak emission wavelength of 440nm-460nm, or emits blue light with a peak emission wavelength of 475nm-485nm.

Further, the first LED light-emitting element and the second LED light-emitting element are both composed of a plurality of LED chips that are electrically connected through the bonding wires.

Further, the electrode includes a first electrode and a second electrode, the substrate pad includes a first substrate pad and a second substrate pad, the first electrode and the first substrate pad connected, the second electrode is connected to the second substrate pad.

Further, the second substrate pad encloses a circular area, the second LED light-emitting element is arranged in the circular area, the first substrate pad and the second substrate pad An annular area is surrounded, and the first LED light-emitting element is arranged in the annular area.

Further, the first LED light-emitting element and the second LED light-emitting element are arranged in the region of the first enclosure wall at intervals.

Further, the phosphor-containing layer is specifically a phosphor powder-containing silica gel layer, the phosphor powder-containing silica gel layer includes a red phosphor and a yellow-green phosphor, and the red phosphor emits red light with a wavelength of 620-660 nm, The yellow-green phosphor emits yellow-green light with a light wavelength of 500-550 nm.

Further, the red phosphor is CaAlSiN ₃ : Eu red phosphor, the particle size of the red phosphor is 17-24 μm, and the yellow-green phosphor is Lu ₃ Al ₅ O ₁₂ : Ce yellow-green phosphor, so The particle size of the yellow-green phosphor is 17-24 μm.

Further, it also includes a diffusing agent-containing layer and a second enclosure wall, the second enclosure wall is provided on the first enclosure wall, the diffusing agent-containing layer covers the phosphor-containing layer, and is contained in the first enclosure wall. Inside the second fence.

Further, the diffusing agent particle size of the diffusing agent-containing layer is spherical particles of 5um-20um, and the diffusing agent-containing layer is a BN diffusing agent containing layer, a TiO ₂ diffusing agent containing layer, a BaCO ₃ diffusing agent containing layer, BaSO _4. a diffusing agent-containing layer, a SiO ₂ diffusing agent-containing layer, and an Al ₂ O ₃ diffusing agent-containing layer, wherein the diffusing agent weight ratio of the diffusing agent-containing layer is 5-20%; the substrate is a plane substrate, and the plane The thickness of the substrate is 0.7-1.5mm, and the plane substrate is an Al ₂ O ₃ plane substrate, an AlN plane substrate, a Cu plane substrate, an Al plane substrate or a composite material plane substrate; the thickness of the second wall is 0.2-0.3mm .

Compared with the prior art, the beneficial effects of the present invention are:

The present invention provides a blue-green adjustable LED human factor lighting device, comprising a substrate, an LED light-emitting element group, a bonding wire, a substrate pad, a first enclosure, a phosphor-containing layer, and an electrode, and the LED light-emitting element group includes at least two LED light-emitting elements with different emission peaks, a plurality of control circuits for controlling the input power of the corresponding LED light-emitting elements are arranged on the substrate, the control circuits are connected with the LED light-emitting elements, and the LED light-emitting element groups, substrate pads, and electrodes are arranged on the substrate. On the bottom, the LED light-emitting element and the substrate pad are electrically connected by bonding wires, the electrode is connected to the substrate pad, the phosphor containing layer is coated on the LED light-emitting element, and the first enclosure is arranged on the LED light-emitting element group, the phosphor The periphery of the containing layer wraps the LED light-emitting element group and the phosphor containing layer. The invention assembles two LED light-emitting elements with different emission peaks on one substrate, designs two independent circuits to control the light-emitting elements with different emission wavelengths, and adjusts the blue-green light intensity by controlling the input power of the different light-emitting elements to adapt to the day and night. Different rhythmic lighting needs help people achieve a state of energy or relaxation according to their daily life patterns.

The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, and implement it according to the content of the description, the preferred embodiments of the present invention are described in detail below with the accompanying drawings. Specific embodiments of the present invention are given in detail by the following examples and the accompanying drawings.

Description of drawings

The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

Fig. 1 is the melatonin sensitive spectrum in the background technology of the present invention;

FIG. 2 is an existing LED light-emitting device and its corresponding light-emitting spectrum in the background technology of the present invention;

3 is a cross-sectional view 1 of a blue-green adjustable LED human factor lighting device according to an embodiment of the present invention;

4 is an equivalent circuit diagram of an internal connection of an LED chip in an embodiment of the present invention;

5 is a front view 1 of a blue-green adjustable LED human factor lighting device according to an embodiment of the present invention;

Fig. 6 is the contrast spectrogram of I1=0 and I1=I2 in the embodiment of the present invention;

7 is a second cross-sectional view of a blue-green adjustable LED human factor lighting device according to an embodiment of the present invention;

FIG. 8 is a second front view of a blue-green adjustable LED human factor lighting device according to an embodiment of the present invention.

In the figure: 1, the substrate; 2, the first LED light-emitting element; 3, the second LED light-emitting element; 4, the bonding wire; 5, the first substrate pad; 6, the second substrate pad; 7, 1st wall; 8, phosphor containing layer; 9, first electrode; 10, second electrode; 11, common electrode; 12, diffusing agent containing layer; 13, second wall; 14, third electrode; 15, first Four electrodes.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, on the premise of no conflict, the embodiments or technical features described below can be combined arbitrarily to form new embodiments. .

The blue-green light adjustable LED human factor lighting device, as shown in Figure 3, includes a substrate 1, an LED light-emitting element group, a bonding wire 4, a substrate pad, a first fence 7, a phosphor containing layer 8, and electrodes, The LED light-emitting element group includes at least two types of LED light-emitting elements with different emission peaks. The substrate 1 is provided with a number of control circuits for controlling the input power of the corresponding LED light-emitting elements. The control circuit is connected to the LED light-emitting element. The LED light-emitting element group, the substrate The bottom pad and the electrode are arranged on the substrate 1, the LED light-emitting element and the substrate pad are electrically connected through the bonding wire 4, the electrode is connected with the substrate pad, and the phosphor containing layer 8 contains absorption and conversion from the above-mentioned LED light-emitting element. The phosphor containing light, the phosphor-containing layer 8 is coated on the LED light-emitting element, the first enclosure 7 is arranged on the periphery of the LED light-emitting element group, the phosphor-containing layer 8, and wraps the LED light-emitting element group, the phosphor-containing layer 8 .

As shown in FIG. 3 , the LED light-emitting element group includes a first LED light-emitting element 2 and a second LED light-emitting element 3, and two independent circuits are provided on the substrate 1; the first LED light-emitting element 2 emits light with a peak wavelength around 440nm-460nm The second LED light-emitting element 3 emits blue light with a peak emission wavelength of 440nm-460nm, or emits blue light with a peak emission wavelength of 475nm-485nm . In this embodiment, the peak wavelength of light emitted by the first LED light-emitting element 2 is 440 nm-460 nm, and the peak wavelength of light emitted by the second LED light-emitting element 3 is 475 nm-485 nm. The substrate 1 is a plane substrate with two independent control circuits arranged on it, the thickness of the plane substrate is 0.7-1.5mm, and the plane substrate is an Al ₂ O ₃ plane substrate, an AlN plane substrate, a Cu plane substrate, an Al plane substrate or a composite Material flat substrate. Preferably, the phosphor-containing layer 8 is a phosphor-containing silica gel layer, and the phosphor-containing silica gel layer includes a red phosphor and a yellow-green phosphor. The red phosphor emits red light with a wavelength of 620-660 nm, and the yellow-green phosphor emits light with a wavelength of 620-660 nm. Yellow-green light with a light wavelength of 500-550 nm.

Assemble two LED light-emitting elements with different emission peaks on one substrate, design two independent circuits to control LED light-emitting elements with different emission wavelengths, and adjust the blue-green light intensity by controlling the input power of different LED light-emitting elements to adapt to day and night. Different rhythmic lighting needs help people achieve a state of energy or relaxation according to their daily life patterns.

As shown in FIG. 4 , preferably, the first LED light-emitting element 2 (LED chip 1 in FIG. 4 ) and the second LED light-emitting element 3 (LED chip 2 in FIG. 4 ) are composed of several LED chips through bonding wires 4 Electrical connection composition. Preferably, the electrodes include a first electrode 9 and a second electrode 10, the first electrode 9 and the second electrode 10 are disposed on the substrate 1, and the substrate pads include a first substrate pad 5 and a second substrate pad 6. The first electrode 9 is connected to the first substrate pad 5 , and the second electrode 10 is connected to the second substrate pad 6 . As shown in FIG. 5 , the substrate 1 is an Al ₂ O ₃ ceramic planar substrate with a thickness of 1.0 mm, on which two independent control circuits are arranged, and the first substrate pad 5 and the first electrode 9 are connected to form an independent Circuit, the second substrate pad 6 and the second electrode 10 are connected to form another independent circuit, and the negative electrodes of the two circuits are connected to the common electrode 11 . The first LED light-emitting element 2 emits blue light with a light emission peak wavelength of around 480 nm, and is arranged in the annular area surrounded by the first substrate pad 5 and the second substrate pad 6, between the LED chips, between the LED chips and the first substrate pad 5. A substrate pad 5 is electrically connected by a bonding wire 4; the second LED light-emitting element 3 emits blue light with a peak emission wavelength of 440 nm, which is arranged in the circular area surrounded by the second substrate pad 6 , between the LED chips and between the LED chips and the second substrate pads 6 are electrically connected by bonding wires 4; the phosphor containing silica gel layer is coated on the LED chip, and the phosphor containing silica gel layer includes red phosphor and green The phosphor, in the present embodiment, uses CaAlSiN 3 :Eu as the red phosphor, and emits red light with a wavelength of 627 nm. The yellow-green phosphor uses Lu3Al5O12:Ce, and emits green light with a wavelength of 535 nm. The phosphor-containing silica gel layer is covered on the first LED light-emitting element 2 and the second LED light-emitting element 3. The height of the phosphor-containing silica gel layer does not exceed the first enclosure wall 7, and the height of the first enclosure wall 7 is in the range of 0.5±0.1mm. Put it down for 2-4 hours to make the red phosphor and yellow-green phosphor settle on the first LED light-emitting element 2 and the second LED light-emitting element 3, and then transfer to an oven at 150±10°C for 2 hours.

In order to make the red phosphor and the yellow-green phosphor settle better, in this embodiment, the particle size of the red phosphor is in the range of 17-24 μm, and the particle size of the yellow-green phosphor is in the range of 17-24 μm.

The first LED light-emitting element 2 and the second LED light-emitting element 3 input currents I1 and I2, which can adjust the light intensity of blue-green light at 480 nm. As a special case, fix I2 and input different currents to I1: when I1=0.5*I2, the first LED light-emitting element 2 and the second LED light-emitting element 3 are both lit and simultaneously excited the red phosphor R627 and the yellow-green phosphor G535; When I1=0, the first LED light-emitting element 2 is off, that is, only the light source of 440 nm excites the red phosphor R627 and the yellow-green phosphor G535. Its spectrum is shown in Figure 6. It can be seen that there is a significant difference in intensity between the two spectra at 480nm. By adjusting the ratio of I1 and I2, the blue-green light intensity at 480nm can be freely adjusted, thus realizing this implementation. Example of blue-green tunable LED human factors lighting device purpose.

As shown in FIG. 7 , it also includes a diffusing agent-containing layer 12 and a second enclosure wall 13 . The second enclosure wall 13 is provided on the first enclosure wall 7 , and the diffusing agent-containing layer 12 covers the phosphor-containing layer 8 and is contained in the second enclosure wall 13 . Inside the enclosure wall 13; the thickness of the second enclosure wall 13 is 0.2-0.3 mm, coat the diffusing agent-containing layer 12 on the phosphor-containing silica gel layer, and then bake in an oven at 150±10°C for 2 hours. Preferably, the diffusing agent-containing layer 12 contains a diffusing agent, the diffusing agent is spherical particles with a particle size of 5um-20um, the diffusing agent-containing layer 12 is a BN diffusing agent-containing layer 12 and a TiO ₂ diffusing agent-containing layer 12 with less light absorption , BaCO ₃ diffusing agent containing layer 12, BaSO ₄ diffusing agent containing layer 12, SiO ₂ diffusing agent containing layer 12, Al ₂ O ₃ diffusing agent containing layer 12, the diffusing agent weight ratio of diffusing agent containing layer 12 is 5-20% , In this embodiment, the SiO ₂ spherical particles with a particle size of 10um and a weight ratio of 15% are used. In the lighting device of this embodiment, in addition to the tunable blue-green light, the blue-green light emitted by the two LED light-emitting elements with different emission peak wavelengths and the red-green light emitted after being absorbed by the phosphor pass through the diffusing agent-containing layer 12, Under the action of the diffusing agent, after numerous refractions and reflections, it is fully mixed to make the emitted light more uniform.

In one embodiment, the first LED light-emitting element 2 and the second LED light-emitting element 3 are arranged in the area of the first enclosure wall 7 at intervals. As shown in FIG. 8 , it includes a ceramic substrate 1 , a first electrode 9 , a second electrode 10 , a third electrode 14 , a fourth electrode 15 , a first LED light-emitting element 2 , a second LED light-emitting element 3 , and a first enclosure 7 and the phosphor-containing layer 8 covering the LED light-emitting element. In this embodiment, the first LED light-emitting element 2 emits blue light with a peak light emission wavelength of around 480 nm, and includes three strings of LED chip groups, which are arranged at intervals in the area of the first enclosure wall 7, and the first LED light-emitting element 2 is formed by the first electrode. 9. The fourth electrode 15 inputs and outputs current; the second LED light-emitting element 3 emits blue light with a light emission peak wavelength of around 440 nm, including four strings of LED chip groups, which are arranged at intervals in the area of the first enclosure 7, and the second LED light-emitting element 3. The current is input and output from the second electrode 10 and the third electrode 14.

The present invention provides a blue-green adjustable LED human factor lighting device, comprising a substrate, an LED light-emitting element group, a bonding wire, a substrate pad, a first enclosure, a phosphor-containing layer, and an electrode, and the LED light-emitting element group includes at least two LED light-emitting elements with different emission peaks, a plurality of control circuits for controlling the input power of the corresponding LED light-emitting elements are arranged on the substrate, the control circuits are connected with the LED light-emitting elements, and the LED light-emitting element groups, substrate pads, and electrodes are arranged on the substrate. On the bottom, the LED light-emitting element and the substrate pad are electrically connected by bonding wires, the electrode is connected to the substrate pad, the phosphor containing layer is coated on the LED light-emitting element, and the first enclosure is arranged on the LED light-emitting element group, the phosphor The periphery of the containing layer wraps the LED light-emitting element group and the phosphor containing layer. The invention assembles two LED light-emitting elements with different emission peaks on one substrate, designs two independent circuits to control the light-emitting elements with different emission wavelengths, and adjusts the blue-green light intensity by controlling the input power of the different light-emitting elements to adapt to the day and night. Different rhythmic lighting needs help people achieve a state of energy or relaxation according to their daily life patterns.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form; any person of ordinary skill in the industry can smoothly implement the present invention as shown in the accompanying drawings and above; however, any Those skilled in the art, without departing from the scope of the technical solution of the present invention, make use of the above-disclosed technical content to make some changes, modifications and equivalent changes of evolution are equivalent embodiments of the present invention; at the same time, Any alteration, modification and evolution of any equivalent changes made to the above embodiments according to the essential technology of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. LED artificial lighting device that blue-green light is adjustable, its characterized in that: the LED light-emitting component group comprises at least two LED light-emitting components with different emission light wave crests, a plurality of control circuits for controlling input power of the corresponding LED light-emitting components are arranged on the substrate, the control circuits are connected with the LED light-emitting components, the LED light-emitting component group, the substrate bonding pads and the electrodes are arranged on the substrate, the LED light-emitting components and the substrate bonding pads are electrically connected through the bonding wires, the electrodes are connected with the substrate bonding pads, the phosphor-containing layer is coated on the LED light-emitting components, and the first enclosing wall is arranged on the periphery of the LED light-emitting component group and the phosphor-containing layer and wraps the LED light-emitting component group and the phosphor-containing layer.

2. The blue-green adjustable LED artificial lighting device of claim 1, wherein: the LED light-emitting element group comprises a first LED light-emitting element and a second LED light-emitting element; the first LED light-emitting element emits blue light with a light-emitting peak wavelength of 440-460 nm or 475-485 nm; the second LED light-emitting element emits blue light having a light emission peak wavelength of about 440nm to 460nm, or emits blue light having a light emission peak wavelength of about 475nm to 485 nm.

3. The blue-green adjustable LED artificial lighting device of claim 2, wherein: the first LED light-emitting element and the second LED light-emitting element are formed by electrically connecting a plurality of LED chips through the bonding wires.

4. The blue-green adjustable LED ergonomic lighting device of claim 3 wherein: the electrodes comprise a first electrode and a second electrode, the substrate bonding pad comprises a first substrate bonding pad and a second substrate bonding pad, the first electrode is connected with the first substrate bonding pad, and the second electrode is connected with the second substrate bonding pad.

5. The blue-green adjustable LED ergonomic lighting device of claim 4 wherein: the second substrate bonding pad is encircled to form a circular area, the second LED light-emitting element is arranged in the circular area, the first substrate bonding pad and the second substrate bonding pad are encircled to form an annular area, and the first LED light-emitting element is arranged in the annular area.

6. The blue-green adjustable LED ergonomic lighting device of claim 3 wherein: the first LED light-emitting element and the second LED light-emitting element are arranged in the area of the first enclosing wall at intervals.

7. The blue-green adjustable LED artificial lighting device of claim 2, wherein: the phosphor-containing layer is specifically a phosphor-containing silica gel layer, the phosphor-containing silica gel layer comprises a red phosphor and a yellow-green phosphor, the red phosphor emits red light with the wavelength of 620-550 nm, and the yellow-green phosphor emits yellow-green light with the wavelength of 500-550 nm.

8. The blue-green adjustable LED ergonomic lighting device of claim 7 wherein: the red phosphor is CaAlSiN₃: eu red phosphor with particle size of 17-24 μm, and Lu as yellow-green phosphor₃Al₅O₁₂: a Ce yellow-green phosphor having a particle size of 17 to 24 μm.

9. The blue-green adjustable LED ergonomic lighting device of claim 7 wherein: the fluorescent material film further comprises a diffusing agent containing layer and a second enclosing wall, wherein the second enclosing wall is arranged on the first enclosing wall, and the diffusing agent containing layer covers the fluorescent material containing layer and is contained in the second enclosing wall.

10. The blue-green adjustable LED ergonomic lighting device of claim 9 wherein: the particle diameter of the diffusant containing layer is 5um-20um, and the diffusant containing layer is a BN diffusant containing layer and TiO₂A diffusion agent-containing layer and BaCO₃Diffusing agent-containing layer and BaSO₄Diffusion agent-containing layer and SiO₂Diffusing agent-containing layer and Al₂O₃A diffusion agent containing layer, wherein the weight ratio of the diffusion agent in the diffusion agent containing layer is 5-20%; the substrate is a planar substrate, the thickness of the planar substrate is 0.7-1.5mm, and the planar substrate is Al₂O₃A planar substrate, an AlN planar substrate, a Cu planar substrate, an Al planar substrate or a composite material planar substrate; the thickness of the second enclosing wall is 0.2-0.3 mm.

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