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A luminescent material that can be excited by ultraviolet and near ultraviolet to emit green light, its preparation method and application

A luminescent material and near-ultraviolet technology, applied in the field of fluorescent materials, can solve the problems of scarcity of green luminescent materials, low color rendering index of devices, lack of red light components, etc., and achieve the effect of simple and feasible method, low reaction temperature and low cost

Active Publication Date: 2021-08-03
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the first way, due to the lack of red light components, the color rendering index of the device is low
[0004] In order to overcome the above defects, the three primary color phosphors excited by near-ultraviolet have shown certain competitiveness in the market, while the green light-emitting materials on the existing market are relatively scarce, and the existing ultraviolet or near-ultraviolet excited green light The material mainly uses energy transfer to excite Tb 3+ Ions produce narrowband emission, this green light not only excites the spectral range, but also causes energy loss

Method used

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  • A luminescent material that can be excited by ultraviolet and near ultraviolet to emit green light, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Potassium carbonate, barium carbonate, europium trioxide, and silicon dioxide were selected as starting materials, and the molar ratio of each element K:Ba:Eu:Si =2:2.97:0.03:8, corresponding to x=0.03, were weighed Four kinds of raw materials, the total weight of the control raw material mixture is 20 grams. Carry out thorough grinding and mixing, put it into a nitrogen-hydrogen mixed reducing atmosphere high-temperature furnace, bake at 950 ° C for 4 hours, take it out when it is cooled to room temperature, and after grinding and dispersing, a green luminescent material suitable for ultraviolet and near-ultraviolet excitation is obtained. Composed of K 2 Ba 2.97 Eu 0.03 Si 8 o 20 .

[0031] It can be seen from the XRD data that the spectrum and K 2 Ba 3 Si 8 o 20 Consistent with each other, it proves that K 2 Ba 2.97 Eu0.3 Si 8 o 20 . It can be seen from the luminescent spectrum data that the green luminescent material emits photoluminescence under the e...

Embodiment 2

[0033] Select lithium carbonate, barium carbonate, europium trioxide, and silicon dioxide as starting materials, and weigh them respectively according to the molar ratio of each element Li:Ba:Eu:Si =2:2.999:0.001:8, corresponding to x=0.001 Four kinds of raw materials, the total weight of the control raw material mixture is 20 grams. Carry out thorough grinding and mixing, put it into a nitrogen-hydrogen mixed reducing atmosphere high-temperature furnace, bake at 850 ° C for 10 hours, take it out when it is cooled to room temperature, and after grinding and dispersing, a green luminescent material suitable for ultraviolet and near-ultraviolet excitation is obtained. Composed of Li 2 Ba 2.999 Eu 0.001 Si 8 o 20 . The fluorescent spectral properties of the green luminescent material are similar to those in Example 1.

Embodiment 3

[0035] Select sodium carbonate, barium carbonate, europium trioxide, and silicon dioxide as starting materials, and weigh them respectively according to the molar ratio of each element Na:Ba:Eu:Si =2:2:1:8, corresponding to x=1 Four kinds of raw materials, the total weight of the control raw material mixture is 20 grams. Carry out thorough grinding and mixing, put it into a nitrogen-hydrogen mixed reducing atmosphere high-temperature furnace, bake at 1150 ° C for 1 hour, take it out when it is cooled to room temperature, and after grinding and dispersing, a green luminescent material suitable for ultraviolet and near-ultraviolet excitation is obtained. Composed of Na 2 Ba 2 EuSi 8 o 20 . The fluorescent spectral properties of the green luminescent material are similar to those in Example 1.

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Abstract

The present invention relates to a luminescent material that can be excited by ultraviolet and near-ultraviolet to emit green light and its preparation method and application. The chemical structural formula of the luminescent material is A 2 B 3‑x Eu x Si 8 o 20 , where A + is the alkali metal ion Li + 、Na + 、K + One or two of B, B is one or two of alkaline earth metals Ca, Sr or Ba, 0.005≤x≤1. The green light-emitting material provided by the present invention can emit green light with a wavelength range of 450-580 nm (peak value is 502 nm) when excited by an excitation light source such as ultraviolet or near-ultraviolet. Strong absorption, perfect match with UV and near UV chips. The preparation method of the above-mentioned luminescent material provided by the present invention has mild conditions, low reaction temperature, simple and feasible method, easy operation, easy mass production, no pollution, and low cost.

Description

technical field [0001] The invention belongs to the field of fluorescent materials, and in particular relates to a luminescent material capable of being excited by ultraviolet and near ultraviolet to emit green light, a preparation method and application thereof. Background technique [0002] White LED (Light Emitting Diode) has many advantages such as non-toxic, long life (100,000 hours), high efficiency and energy saving, all solid state, low working voltage, shock resistance and good safety, and can be widely used in various lighting facilities. Including indoor lights, traffic lights, street lights, automobile tail lights, direction lights, brake lights, outdoor super-large screens, display screens and advertising boards, etc., is an environmentally friendly, energy-saving green lighting source, is generally considered to be 21 A new light source that replaces traditional lighting devices in the century. However, the efficiency of the developed white LED green luminesce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59H01L33/50
CPCC09K11/7734H01L33/504
Inventor 康晓娇吕伟凌东雄
Owner DONGGUAN UNIV OF TECH