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Composite transparent ceramic used for white-light LED fluorescence conversion and preparation method thereof

A transparent ceramic and fluorescent technology, which is applied in the direction of ceramic layered products, chemical instruments and methods, and layered products, can solve the problems of reduced luminous efficiency, large temperature influence, and insufficient red light components, and achieve low cost and high luminescence The effect of high quenching temperature and stable physical and chemical properties

Inactive Publication Date: 2012-06-20
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

[0005] However, the use of Ce:YAG transparent fluorescent ceramics also needs to solve the problem of insufficient red light components
If a method similar to phosphor powder is adopted, that is, co-doping other ions to prepare transparent ceramics, there are also great limitations: one is to co-dope other ions to adjust the red shift of the Ce:YAG luminescence spectrum, which requires co-doping ions The concentration of the luminescence is very high to move the luminescence peak, which not only increases the difficulty and cost of the preparation process, but also has little effect; the other is the co-doping of ions that directly emit red light, Ce 3+ The energy transfer between ions and other ions also leads to a significant decrease in its luminous efficiency; there is also a Ce:YAG transparent ceramic and a Ce-sensitized red-emitting transition metal element doped YAG transparent ceramic composite, Ce and transition metal elements The energy transfer between them is greatly affected by temperature, and the luminescence stability is not good

Method used

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  • Composite transparent ceramic used for white-light LED fluorescence conversion and preparation method thereof
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  • Composite transparent ceramic used for white-light LED fluorescence conversion and preparation method thereof

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preparation example Construction

[0025] The preparation method of this composite transparent ceramic is:

[0026] Using yttrium oxide (Y 2 o 3 ), alumina (Al 2 o 3 ), praseodymium oxide (Pr 2 o 3 ), cerium oxide (CeO 2 ) as raw material, according to (Pr x Y 1-x ) 3 al 5 o 12 , (Ce y Y 1-y ) 3 al 5 o 12 (wherein, 0.0003≤x≤0.06, 0.0001≤y≤0.06) are composed of two kinds of powder raw materials, respectively, and then use wet ball milling to prepare ceramic powder with absolute ethanol or deionized water as the medium, and the two kinds of powder Respectively dried, sieved, and pressed into tablets; then subjected to cold isostatic pressing above 150MPa to form a green body; then put into a vacuum or hot-pressed sintering furnace and sintered at a certain temperature for several hours to obtain (Pr x Y 1-x ) 3 al 5 o 12 , (Ce y Y 1-y ) 3 al 5 o 12 Transparent ceramics, the surface of the obtained two transparent fluorescent ceramic materials is polished, and then bonded on the side of th...

Embodiment 1

[0028] Using yttrium oxide (Y 2 o 3 ), alumina (Al 2 o 3 ), praseodymium oxide (Pr 2 o 3 ), cerium oxide (CeO 2 ) as raw material, according to (Pr 0.0003 Y 0.9997 ) 3 al 5 o 12 , (Ce 0.0003 Y 0.9997 ) 3 al 5 o 12 The chemical composition of the two kinds of powders were prepared respectively 50g, and then the ceramic powders were prepared by wet ball milling with absolute ethanol as the medium. The two kinds of powders were dried, sieved, and pressed respectively; Cold isostatic pressing into green bodies, each placed in a vacuum sintering furnace and sintered at 1650°C for 24 hours to obtain (Pr 0.0003 Y 0.9997 ) 3 al 5 o 12 , (Ce 0.0003 Y 0.9997 ) 3 al 5 o 12 Transparent fluorescent ceramics are obtained by polishing the surface of the two transparent ceramic materials and then bonding them on the side of the junction (Pr 0.0003 Y 0.9997 ) 3 al 5 o 12 / (Ce 0.0003 Y 0.9997 ) 3 al 5 o 12 Composite transparent ceramic.

Embodiment 2

[0030] Sintering holding temperature is 1680 ℃, and sintering holding time is 20 hours, and other conditions are the same as embodiment 1, can obtain equally (Pr 0.0003 Y 0.9997 ) 3 al 5 o 12 / (Ce 0.0003 Y 0.9997 ) 3 al 5 o 12 Composite transparent ceramic.

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Abstract

A composite transparent ceramic used for white-light LED fluorescence conversion and a preparation method thereof are provided. The composite transparent ceramic is composed of an upper and a lower layer of transparent ceramic bonded; chemical composition of the upper layer of transparent ceramic is (PrxY1-x)3Al5O12, wherein 0.0003<=x<=0.06; and chemical composition of the lower layer of transparent ceramic is (CeyY1-y)3Al5O12, wherein 0.0003<=y<=0.06. When a blue-light LED excites the composite transparent ceramic, yellow light generated by the lower layer of transparent ceramic mixes with red light generated by the upper layer of transparent ceramic and blue light transmitted through the upper layer of transparent ceramic to form high-quality white light, to thereby obtain the characteristics of high color rendering index and mild color temperature. In addition, the inventive composite transparent ceramic has the advantages of high shine quenches temperature, stable physicochemical properties, low cost, etc.

Description

technical field [0001] The invention relates to a transparent fluorescent ceramic material, in particular to a composite transparent ceramic used for fluorescent conversion of a white light laser diode (hereinafter referred to as LED) and a preparation method thereof. The composite transparent ceramic consists of an upper layer (Pr x Y 1-x ) 3 Al 5 o 12 (0.0003≤x≤0.06) transparent ceramic and lower layer (Ce y Y 1-y ) 3 Al 5 o 12 (0.0003≤y≤0.06) Transparent ceramics are formed by side bonding. Background technique [0002] White LEDs are developing rapidly and have been applied in urban landscapes, indoor and outdoor general lighting, automotive lights, flat panel display backlights and other fields. At present, the most common white light LED production scheme is InGaN / GaN-based blue light chip plus cerium-doped yttrium aluminum garnet Ce 3+ :Y 3 Al 5 o 12 (Ce:YAG) phosphor, InGaN / GaN chip emits blue light to excite Ce:YAG phosphor to produce yellow light, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B18/00C04B35/44C04B35/505C04B35/622
Inventor 周圣明滕浩林辉易庆陈冲
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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