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Glass ceramic for blue light-excited white-light LED (Light-Emitting Diode), and preparation method thereof

A glass ceramic, blue light excitation technology, applied in the field of solid luminescent materials, can solve the problems of LED color shift, limited service life, easy yellowing of epoxy resin, etc., and achieves stable physical and chemical properties, adjustable color temperature, and high color rendering index. Effect

Active Publication Date: 2014-01-08
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the high-temperature environment generated by high-power chips, the epoxy resin is easy to yellow, causing color shift of the LED, which greatly limits its service life

Method used

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  • Glass ceramic for blue light-excited white-light LED (Light-Emitting Diode), and preparation method thereof
  • Glass ceramic for blue light-excited white-light LED (Light-Emitting Diode), and preparation method thereof
  • Glass ceramic for blue light-excited white-light LED (Light-Emitting Diode), and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Example 1: Analytical pure SiO 2 , Y 2 o 3 、Al 2 o 3 , Li 2 CO 3 , ZrO 2 , CeO 2 Powder, according to 0.5CeO 2 : 15SiO 2 : 34.5Y 2 o 3 : 20Al 2 o 3 : 15Li 2 CO 3 : 15ZrO 2 (Molar ratio) is accurately weighed and placed in an agate mortar, ground for more than half an hour to make it evenly mixed, then placed in a platinum crucible, heated to 1500°C in an atmosphere protection furnace, and kept for 1 hour, then, The molten liquid is quickly poured into a graphite mold to form a glass ceramic directly; the obtained glass ceramic is placed in a resistance furnace, annealed at 800°C for 3 hours, and then cooled with the furnace to eliminate internal stress. X-ray diffraction results (such as figure 1 shown) indicates that Y is precipitated in the glass matrix 3 Al 5 o 12 crystal phase. The sample was surface polished (sample thickness 0.5 mm), and its emission spectrum at room temperature was measured with a FLS920 fluorescence spectrometer (such as f...

example 2-18

[0020] Example 2-18: Change the material composition and process conditions of Example 1 (see Table 1, Table 2), and obtain glass ceramics directly after quenching the melt. X-ray diffraction results showed that Y was precipitated in the glass matrix 3 Al 5 o 12 crystal phase. The surface of the sample is polished (sample thickness is 0.5 mm), and its emission spectrum at room temperature is measured with a FLS920 fluorescence spectrometer. Under 465 nm blue light excitation, for Examples 2-12, Ce was detected 3+ : 5d→4f broadband emission (such as figure 2 shown); for Examples 13-14, Ce 3+ : The broadband emission of 5d → 4f appears red-shifted; for examples 15-18, Ce is also observed 3+ : 5d → 4f broadband emission and co-doped with different active ions (Eu 3+ ,Sm 3+ ,Pr 3+ ,Mn 2 ) of the red emission. The above-mentioned glass-ceramic samples all emit bright white light when observed with the naked eye.

[0021] Table 1 Material composition and process conditi...

example 19-24

[0025] Examples 19-24: Change the material components and process conditions of Example 1 (see Table 3), and obtain glass ceramics directly after quenching the melt. The results of X-ray diffraction showed that the precipitation of R in the glass matrix 3 m 5 o 12 (R=Y, one of Gd, Lu, Sc, La; M=Al, one of Ga, In) crystal phase. The surface of the sample is polished (sample thickness is 0.5 mm), and its emission spectrum at room temperature is measured with a FLS920 fluorescence spectrometer. Under the excitation of 465 nm blue light, the typical Ce can be observed 3+ : 5d → 4f broadband emission. The above-mentioned glass-ceramic samples all emit bright white light when observed with the naked eye.

[0026] Table 3 Material composition and process conditions

[0027]

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Abstract

The invention discloses a glass ceramic for a blue light-excited white-light LED (Light-Emitting Diode), and a preparation method thereof. The glass ceramic is structurally characterized in that R3M5O12:Ce, R' micrometer crystallized phase is inlaid in an oxide glass substrate, wherein R is one of Y, Gd, Lu, Sc and La; M is one of Al, Ga and In; R' is one of Eu, Sm, Pr and Mn; the content of the micrometer crystallized phase accounts for 10-50wt% of the glass ceramic. The glass ceramic is prepared by adopting a melt quenching method or combining the melt quenching method with follow-up thermal treatment. The glass ceramic can be used as a fluorescent material for manufacturing a novel blue light-excited white-light LED device.

Description

technical field [0001] The invention relates to the field of solid luminescent materials, in particular to a glass ceramic capable of realizing white light emission under blue light excitation and a preparation process thereof. Background technique [0002] White LEDs have the advantages of high efficiency, no pollution, and long life, and are regarded as a new generation of solid-state lighting sources. At present, there are mainly three technical solutions to realize LED white light emission: (1) Combining LED red, green and blue multi-chips to emit light and synthesize white light, but the different light decays of the three chips lead to unstable color temperature, and the complexity of the control circuit increases the cost; (2) Using a near-ultraviolet light chip to excite phosphor powder to emit red, green, and blue primary colors to synthesize white light. This scheme has low energy efficiency, and the leakage of ultraviolet light is harmful to the human body; The l...

Claims

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Application Information

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IPC IPC(8): C03C10/02
Inventor 王元生林航余运龙
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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