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Fluorescent glass sheet for white light LED and preparation method thereof

A technology of fluorescent glass and white light, which is applied in the field of luminescent glass materials and preparations for white LEDs. It can solve the problems of complex preparation methods, high bubble content in fluorescent glass, and poor luminous stability. It achieves good environmental stability and low thickness of the glass layer. The effect of control and low cost

Active Publication Date: 2015-12-09
ANHUI LANRUI ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of the above fluorescent glass is complex, the prepared fluorescent glass contains high bubbles, and the luminescence stability is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: Fluorescent glass sheet material and its preparation

[0014] (1) As the glass substrate layer, a commercially available slide glass with a thickness of 1.1 mm and a light transmittance greater than 93% was selected as the substrate layer.

[0015] (2) Preparation of basic flux glass powder used in fluorescent glass layer: composition of SiO by weight chemical percentage 2 :45, B 2 o 3 :16、Al 2 o 3 :3, ZnO:7, BaO:8, SrO:6, K 2 O:6, Na 2 O: 9 composition ingredients, of which composition oxide B 2 o 3 Introduced by boric acid; composition oxides BaO, SrO, K2O, Na 2 O is introduced by carbonate; composition oxide Al 2 o 3 from Al(OH) 3 Introduced; composition oxide SiO 2 ,, ZnO is introduced directly from the oxide. The batch materials are fully ball milled and mixed, melted at 1150°C, kept for 1 hour, water quenched, and ball milled to 300 mesh sieve for use.

[0016] (3) The fluorescent material is YAG-based yellow fluorescent powder with a 3...

Embodiment 2

[0019] Embodiment 2: change the basic flux glass and its melting temperature in embodiment 1 (2), the basic glass weight chemical percentage group is SiO 2 :40, B 2 o 3 :18、Al 2 o 3 :3, ZnO:8, BaO:9, SrO:4, K 2 O:8, Na 2 0:10; Melting temperature is 1100 DEG C; Change the basic flux glass powder prepared in embodiment 1 (4) and the prepared yellow light YAG phosphor body quality to be 85%: 15%, after fully mixing, Coated on the selected glass substrate layer, fired at 650°C for 15 minutes in an air atmosphere at normal pressure, and then cooled naturally to obtain a fluorescent glass sheet. All the other processing steps are with embodiment 1.

[0020] The fused fluorescent glass layer of the prepared fluorescent glass sheet has smooth surface, uniform body color, no visible bubbles, bright yellow and translucent.

Embodiment 3

[0021] Embodiment 3: change the basic flux glass and its melting temperature in embodiment 1 (2), the basic glass weight chemical percentage group is SiO 2 :40, B 2 o 3 :18、Al 2 o 3 :3, ZnO:8, BaO:9, SrO:4, K2O:8, Na 2 O:6, Li 2 O:4; among them Li 2 O by Li 2 CO 3introduce. The melting temperature is 1050°C; change the mass ratio of the prepared basic glass powder and the prepared yellow light YAG phosphor powder in Example 1 (4) to 90%: 10%, after fully mixing, coating on the selected On the glass substrate layer, it is fired at 620°C for 20 minutes in an air atmosphere at normal pressure, and then the product is obtained by naturally cooling down. All the other processing steps are with embodiment 1.

[0022] The fused fluorescent glass layer of the prepared fluorescent glass sheet has a smooth surface, uniform body color, no visible bubbles, and is yellow and translucent.

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Abstract

The invention discloses a fluorescent glass piece for a white-light LED (Light Emitting Diode) and a preparation method thereof. The fluorescent glass piece is characterized by being composed of a transparent glass substrate layer and a fluorescent glass layer which is melted to be integrated with the surface of the transparent glass substrate layer, wherein the fluorescent glass layer is prepared by steps of coating batch containing a basic solvent (glass powder) and fluorescent powder which hare in a certain proportion on the glass substrate and firing at certain temperature; and the preparation method is characterized by adopting the steps of coating the batch of the fluorescent glass on the glass substrate layer and firing at certain temperature and under the condition of normal-pressure air or N2 atmosphere. The fluorescent glass piece for the white-light LED is low in porosity and good in environmental stability, and is especially suitable for package of LEDs with low heat resistance and large power.

Description

technical field [0001] The invention relates to the field of luminescent glass materials for white light LEDs and its preparation, in particular to a luminescent glass diaphragm for white light LEDs with high luminous efficiency, low thermal resistance and high power and a preparation method thereof. Background technique [0002] Currently, blue LED chips combined with yellow phosphor powder are the most common white LED products on the market, and have become the mainstream of white LEDs. However, the phosphor directly coated on the surface of the LED chip is susceptible to aging and light decay due to the influence of temperature, and is not easy to disperse evenly and cause color spots. The consistency is difficult to meet the application requirements of high color rendering and backlight, so it is used in far-field excitation. Fluorescent glass is considered the most promising solution to this problem. Chinese patent (CN201010541582) discloses a high-crystallinity YAG f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/02C03C12/00
Inventor 李栋才储昭学
Owner ANHUI LANRUI ELECTRONICS TECH
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