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Composite fluorescent transparent ceramic used for white-light LED and adopting garnet structure

A technology of fluorescent ceramics and composite ceramics, which is applied in the field of high-efficiency white light LED composite transparent fluorescent ceramic structures, can solve the problems of reduced luminous efficiency, poor thermal stability, loss of light output, etc., and achieves high color rendering index, high quantum efficiency, high light effective effect

Inactive Publication Date: 2014-08-06
张红卫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the research process of this kind of LED packaging, there is a prominent problem: poor thermal stability
The problem with this method is that there is a certain thickness of air interlayer between the interface of the upper and lower ceramic sheets, which causes a certain degree of loss of light output and reduces the luminous efficiency.

Method used

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  • Composite fluorescent transparent ceramic used for white-light LED and adopting garnet structure
  • Composite fluorescent transparent ceramic used for white-light LED and adopting garnet structure
  • Composite fluorescent transparent ceramic used for white-light LED and adopting garnet structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Press (Ce 0.1％ Y 99.9％ ) 3 Al 5 o 12 Chemical composition weighing α-Al 2 o 3 Powder, Y 2 o 3 Powder, CeO 2 Powder raw materials, according to (Ce 0.1％ SM 0.2％ Y 99.7％ ) 3 Al 5 o 12 Chemical composition weighing CeO 2 Powder, α-Al 2 o 3 Powder, Y 2 o 3 Powder, Sm 2 o 3 Powder. Add 0.1200g of TEOS and 0.5400g of PVB into the high-purity agate ball milling tank for the two types of mixed powder, add 80g of high-purity agate balls, 12g of absolute ethanol, and pour them into the defoaming machine after ball milling for 20 hours. 20 min, and then cast by a casting machine to obtain a 600-micron casting layer. The prepared (Ce 0.1％ SM 0.2％ Y 99.7％ ) 3 Al 5 o 12 and (Ce 0.1％ Y 99.9％ ) 3 Al 5 o 12 Ten layers of casting layers are stacked to form a composite ceramic casting layer of 20 layers, put into a dry pressing mold at 110°C for 10 hours, press unidirectionally with a pressure axis of 20Mpa to form a non-layered integral composite ceramic ...

Embodiment 2

[0033] Take (Ce 0.1％ Y 99.9％ ) 3 al 5 o 12 Cast layer six layers, (Ce 0.1％ SM 0.2％ Y 99.7％ ) 3 al 5 o 12 Part of the six layers, after polishing, the thickness of the sample obtained is 1.30mm, where (Ce 0.1％ Y 99.9％ ) 3 al 5 o 12 Part thickness is 0.65mm, (Ce 0.1％ SM 0.2％ Y 99.7％ ) 3 al 5 o 12 Part thickness is 0.65mm. Other conditions were the same as in Example 1 to obtain a composite transparent fluorescent ceramic with a visible light transmittance of 83.2%.

[0034] The transparent ceramic white light LED prepared in this example is driven by a 20mA constant current, and a 450nm blue light chip is excited to obtain a white light LED, and its performance indicators are as follows:

[0035] Light effect: 135lm / W

[0036] Quantum Efficiency: 95.2%

[0037] Color rendering index: 79

[0038] Color temperature: 5700K.

Embodiment 3

[0040] Press (Ce 0.1％ Y 99.9％ ) 3 al 5 o 12 Chemical composition weighing α-Al 2 o 3 Powder, Y 2 o 3 Powder, CeO 2 Powder raw materials, according to (Ce 0.1％ Gd 5％ Y 94.9％ ) 3 al 5 o 12 Chemical composition weighing CeO 2 Powder, α-Al 2 o 3 Powder, Y 2 o 3 Powder, Gd 2 o 3 Powder. The sintering temperature was 1825° C., the holding time was 25 hours, and the other conditions were the same as in Example 2 to obtain a composite transparent fluorescent ceramic with a visible light transmittance of 82.7%.

[0041] The transparent ceramic white light LED prepared in this example is driven by a 20mA constant current, and a 450nm blue light chip is excited to obtain a white light LED, and its performance indicators are as follows:

[0042] Light effect: 134lm / W

[0043] Quantum Efficiency: 94.9%

[0044] Color rendering index: 80

[0045] Color temperature: 5600K.

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Abstract

The invention relates to the field of transparent fluorescent ceramics of LEDs, and discloses a composite fluorescent transparent ceramic used for a white-light LED and adopting a garnet structure. The composite fluorescent transparent ceramic is prepared through tape casting and vacuum sintering; and the chemical composition of the transparent ceramic comprises N transparent ceramic phosphors or non-phosphor components with different LED light emitting properties, wherein N is larger than or equal to 2. The prepared composite fluorescent transparent ceramic is simple in structure, the packaging process is simplified, the white-light LED has high luminous efficacy, high color rendering index, high quantum efficiency and excellent temperature quenching performance, and the composite fluorescent transparent ceramic can be used for packaging various white-light LED devices.

Description

technical field [0001] The invention relates to the field of transparent fluorescent ceramics for LEDs, in particular to a composite transparent fluorescent ceramic structure for white LEDs with high light efficiency. Background technique [0002] White LED has many advantages such as small solidification, instant start and fast response (μs), energy saving, long life, green and high efficiency, etc. It is widely used in various architectural and landscape lighting, automotive lighting, medical treatment and various portable lighting, etc., and has been developed Become the fourth generation of new lighting sources. At present, the most widely used and most mature white light LED technology is GaN-based blue light chip plus yellow phosphor (cerium-doped yttrium aluminum garnet, Ce:Y 3 Al 5 o 12 ) technology, which excites blue light through GaN chips, and part of the blue light excites Ce:Y 3 Al 5 o 12 The phosphor produces yellow light, which mixes with the remaining ...

Claims

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Application Information

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IPC IPC(8): C04B35/44C04B35/622
Inventor 张红卫陈剑
Owner 张红卫
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