A kind of red light-emitting glass-ceramic for white light LED and preparation method thereof

A red light-emitting, glass-ceramic technology, applied in the field of white light LED light-emitting materials, can solve the problems of increasing difficulty and cost, difficult to obtain qualified products, cold light, high color temperature and low color rendering index, etc., to reduce the probability of erosion and save money. cost, good performance

Active Publication Date: 2021-12-21
SHANGHAI INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, just changing the packaging material from epoxy resin to glass ceramics does not change the shortcomings of cold light, high color temperature, and low color rendering index.
In order to solve this problem, most of the literature reports are to add red phosphor to it to improve its color temperature, which undoubtedly increases the difficulty and cost of preparation, and because the current mature red phosphor is nitride, and nitride and precursor Glass powder is easy to react at high temperature, which makes it difficult to mix red phosphor powder into the glass matrix, and it is difficult to obtain qualified products. The obtained products are opaque black

Method used

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  • A kind of red light-emitting glass-ceramic for white light LED and preparation method thereof
  • A kind of red light-emitting glass-ceramic for white light LED and preparation method thereof
  • A kind of red light-emitting glass-ceramic for white light LED and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] According to the mole percentage of each raw material, according to 10% Na 2 O, 20% ZnO, 30% B 2 o 3 , 20% SiO 2 , 20% of the MgO ratio is fully mixed, the raw materials are mixed evenly and then melted, the melting temperature is 1000 ℃, heat preservation for 1 hour, and the glass liquid is obtained; the glass liquid is poured into cold water, and the water quenching is carried out to obtain the transparent matrix glass ; Grind the matrix glass into powder, and mix it uniformly with the red phosphor in a mass ratio of 1:0.1, sinter in a muffle furnace at a sintering temperature of 600°C, and a sintering time of 30 minutes, and then start annealing at the glass transition temperature Tg. The temperature is lowered to 20°C at a cooling rate of 5-10°C / hour to obtain red fluorescent glass for white LEDs; the sintering method is air atmosphere sintering, and the annealing method is air atmosphere annealing.

[0038] The annealed red fluorescent glass was ground and polis...

Embodiment 2

[0040] According to the mole percentage of each raw material, according to 10% Na 2 O, 20% ZnO, 30% B 2 o 3 , 20% SiO 2 , 20% of the MgO ratio is fully mixed, the raw materials are mixed evenly and then melted, the melting temperature is 1100 ℃, heat preservation for 1 hour, and the glass liquid is obtained; the glass liquid is poured into cold water, and the water quenching is carried out to obtain a transparent matrix glass ; Grind the matrix glass into powder, and mix it uniformly with the red phosphor in a mass ratio of 1:0.1, sinter in a muffle furnace at a sintering temperature of 600°C, and a sintering time of 30 minutes, and then start annealing at the glass transition temperature Tg. The temperature is lowered to 20°C at a cooling rate of 5-10°C / hour to obtain red fluorescent glass for white LEDs; the sintering method is air atmosphere sintering, and the annealing method is air atmosphere annealing.

[0041] The annealed red fluorescent glass was ground and polishe...

Embodiment 3

[0043] According to the mole percentage of each raw material, according to 15% Na 2 O, 25% ZnO, 25% B 2 o 3 , 25% SiO 2 , 10% MgO ratio is fully mixed, the raw materials are mixed evenly and then melted, the melting temperature is 1100 ℃, heat preservation for 1 hour, and the glass liquid is obtained; the glass liquid is poured into cold water, and the water quenching is carried out to obtain a transparent matrix glass ; Grind the matrix glass into powder, and mix it uniformly with the red phosphor in a mass ratio of 1:0.1, sinter in a muffle furnace at a sintering temperature of 600°C, and a sintering time of 30 minutes, and then start annealing at the glass transition temperature Tg. The temperature is lowered to 20°C at a cooling rate of 5-10°C / hour to obtain red fluorescent glass for white LEDs; the sintering method is air atmosphere sintering, and the annealing method is air atmosphere annealing.

[0044] The annealed red fluorescent glass was ground and polished to ob...

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Abstract

The invention provides a red luminous glass ceramic for white light LEDs and a preparation method thereof, belonging to the technical field of rare earth luminescent materials. The red luminescent glass-ceramic is composed of matrix glass and red fluorescent powder; the preparation method is to firstly prepare matrix glass by melting method, and grind it into glass powder, then mix the glass powder and red phosphor powder, and obtain a red color after sintering and annealing. Luminous glass ceramic. The red luminescent glass ceramic has a high color rendering index of Ra≥80, excellent optical performance and high reliability, and can be used for white LED devices with high color rendering index.

Description

technical field [0001] The invention relates to the field of white light LED luminescent materials, in particular to a red light emitting glass ceramic for white light LED and a preparation method thereof. Background technique [0002] At present, solid-state lighting is widely respected because of its low pollution, resource saving and long life. The most widely used in the market is white LEDs packaged with blue chips and YAG:Ce phosphors. The disadvantages of this type of technology are as follows: First, this type of white LED often has a relatively high color temperature and a low color rendering index, and it is easy to cause eye fatigue under long-term lighting, which is not conducive to lighting in general life; second, the market common The best packaging method is to mix phosphor powder and silica gel and coat it on the blue chip. Although this method is simple, after a period of use, the product is prone to color drifting. This is because the heat generated by th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C4/12C03C4/02C03C3/066C03C10/00
CPCC03C3/066C03C4/02C03C4/12C03C10/00
Inventor 李杨邹军石明明杨波波李文博房永征
Owner SHANGHAI INST OF TECH
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