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High-heat-stability white light light-emitting glass for borate matrix LED, and preparation method of light-emitting glass

A technology of luminescent glass and thermal stability, applied in luminescent materials, chemical instruments and methods, electrical components, etc., can solve the problems affecting the luminous performance and service life of white LED devices, the influence of the spectral energy distribution of mixed powder, and the accuracy requirements of mixing technology It can achieve the effect of low preparation cost, excellent thermal stability and high transmittance.

Active Publication Date: 2017-08-29
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the luminous intensity, particle size and distribution of monochromatic phosphors, they all have an impact on the spectral energy distribution of the mixed powder, and after the three-color phosphors are mixed, there are problems such as low energy efficiency, emission and reabsorption, and for the mixed technology. Higher precision requirements and therefore increased production costs
In addition, epoxy resin, the packaging material used for white LEDs, has poor thermal conductivity. Therefore, under longer working conditions, due to the high operating temperature of the LED chip, the resin will turn yellow and the transmittance will deteriorate, which seriously affects the white LED device. Luminous performance and service life

Method used

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  • High-heat-stability white light light-emitting glass for borate matrix LED, and preparation method of light-emitting glass
  • High-heat-stability white light light-emitting glass for borate matrix LED, and preparation method of light-emitting glass
  • High-heat-stability white light light-emitting glass for borate matrix LED, and preparation method of light-emitting glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to 84SrO-200B 2 o 3 -2.5Tb 4 o 7 -3Eu 2 o 3 The stoichiometric ratio of 2.5850g SrO, 8.2704gB 2 o 3 , 0.5524g Tb 4 o 7 , 0.3120g Eu 2 o 3 Mix evenly, keep warm at 1250°C for 4 hours, and cool down to room temperature naturally to obtain luminescent glass 84SrO-200B 2 o 3 -2.5Tb 4 o 7 -3Eu 2 o 3 . The luminescent glass emits white light with a chromaticity of (0.359, 0.426).

[0020] The inventor tested the thermal stability of the white luminescent glass prepared above, and compared it with the thermal stability of the commercial fluorescent red powder DS-200. The results are shown in figure 1 and figure 2 . From figure 1 and 2 It can be seen that with the increase of temperature, the 84SrO-200B 2 o 3 -2.5Tb 4 o 7 -3Eu 2 o 3 The luminous intensity of the luminescent glass decreases slowly. When the temperature is 548K, the luminous intensity is still 82.5% of the luminous intensity at room temperature, and the thermal stability is b...

Embodiment 2

[0023] According to 88SrO-200B 2 o 3 -2Tb 4 o 7 -2Eu 2 o 3 The stoichiometric ratio of 9.3534g SrO, 8.2704g B 2 o 3 , 0.5524g Tb 4 o 7 , 0.2080g Eu 2 o 3 Mix evenly, keep warm at 1250°C for 4 hours, cool naturally to room temperature, and obtain white light emitting glass 88SrO-200B 2 o 3 -Tb 4 o 7-3Eu 2 o 3 , and its chromaticity is (0.343, 0.430).

Embodiment 3

[0025] According to 86.2SrO-200B 2 o 3 -2.2Tb 4 o 7 -2.5Eu 2 o 3 The stoichiometric ratio of 9.1565g SrO, 8.2704gB 2 o 3 , 0.6076g Tb 4 o 7 , 0.2600g Eu 2 o 3 Mix evenly, keep warm at 1250°C for 4 hours, and cool down to room temperature naturally to obtain white light emitting glass 86.2SrO-200B 2 o 3 -2.2Tb 4 o 7 -2.5Eu 2 o 3 , and its chromaticity is (0.350, 0.429).

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Abstract

The invention discloses high-heat-stability white light light-emitting glass for a borate matrix LED, and a preparation method of the light-emitting glass. The chemical formula of the light-emitting glass is (100-4x-2y)SrO-200B2O3-xTb4O7-yEu2O3, wherein x is greater than or equal to 2 and smaller than or equal to 3, and y is greater than or equal to 2 and smaller than or equal to 5. The white light light-emitting glass provided by the invention is near ultraviolet excited white light luminescent borate glass, has the light-emitting character of fluorescent powder and also has the encapsulation performance of epoxy resin, so the fluorescent power and the epoxy resin encapsulation material for the traditional white light LED can be replaced and the preparation process of the traditional white light LED is simplified; furthermore, the white light light-emitting glass has the advantages of high transmittance, high heat stability and the like, can solve the problems that the epoxy resin for LED encapsulation is liable to ageing as well as the heat stability, the heat conductivity and the transmittance are reduced along with the increment of the use time, also can solve the problems that chroma excursion, light intensity thermal quenching and the like occur in the traditional LED fluorescent powder, and can be used for preparing white light LED devices with high heat stability and low cost through a simple process.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a white light luminescent glass for borate matrix LED with high thermal stability and a preparation method thereof. Background technique [0002] Compared with the lighting materials currently used, LEDs that directly emit white light have the advantages of long life, high energy efficiency, and environmental friendliness. Therefore, white LEDs have gradually become the mainstream demand for solid-state lighting in society to replace incandescent lamps and fluorescent tubes currently used. [0003] Among the current technologies for realizing white light LEDs, there is a technology that is excited by near-ultraviolet light, and uses red, green, and blue phosphors that emit three different colors to emit light and combine to obtain white light. And for lighting engineering, the white light phosphor with warm white temperature is the most demanded. Howeve...

Claims

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Application Information

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IPC IPC(8): C03C4/12C03C3/15C09K11/78H01L33/50H01L33/56
CPCC03C3/15C03C4/12C09K11/7797H01L33/504H01L33/56
Inventor 苟婧俞斌勋范晶艳
Owner SHAANXI NORMAL UNIV
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