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A kind of borate orange phosphor for white LED and preparation method thereof

A technology of borate and phosphor, which is applied in the field of borate orange phosphor for white LED and its preparation, can solve the problems of poor stability of phosphor, harsh synthesis conditions, complex synthesis process, etc. The effect of low temperature and high luminous efficiency

Active Publication Date: 2021-03-23
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this kind of phosphor has poor stability and is easy to deliquescence
Xie R et al. reported that at 10atmN 2 CaAlSiN was obtained under the condition of holding at 1800℃ for 2h 3 :Eu 2+ red phosphor; Hoppe et al. reported the first metal and N 2 React at 550-800°C to prepare alkaline earth and rare earth nitrides, and then react at 1500-1600°C and 1atm N 2 under the protection of Si 3 N 4 Prepared under reaction (Ba 2-x Eu x ) 2 Si 5 N 8 Red phosphors; in general, the synthesis process of red phosphors such as nitrides and nitrogen oxides is relatively complicated, and the synthesis conditions are relatively harsh

Method used

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  • A kind of borate orange phosphor for white LED and preparation method thereof
  • A kind of borate orange phosphor for white LED and preparation method thereof
  • A kind of borate orange phosphor for white LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] According to KSr 1.999 Zr(BO 3 ) 3 : 0.001Eu 2+ The stoichiometric ratio weighs K 2 CO 3 , SrCO 3 , ZrO 2 、H 3 BO 3 and Eu 2 o 3 , the molar ratio between them is 0.5: 1.999: 1: 3: 0.0005. After fully grinding and mixing, the mixture is placed in a corundum crucible, and then put into a high-temperature furnace and baked at 800 ° C for 7 hours under a CO atmosphere, followed by The crucible was slowly cooled to room temperature to obtain a borate orange phosphor.

[0023] From figure 1 It can be seen from the figure that the excitation spectrum of the fluorescent powder obtained in this embodiment is a broad spectrum, covering the ultraviolet, violet and blue light regions, and the excitation peak is located near 365nm, indicating that the phosphor powder obtained in this embodiment can be detected by ultraviolet, violet and blue light chips. Effective stimulation. When the excitation wavelength of the emission spectrum is 365nm, from figure 2 It can be s...

Embodiment 2

[0025] According to KSr 1.99 Zr(BO 3 ) 3 : 0.01Eu 2+ The stoichiometric ratio weighs K 2 CO 3 , SrCO 3 , ZrO 2 、H 3 BO 3 and Eu 2 o 3 , the molar ratio between them is 0.5: 1.99: 1: 3: 0.005. After fully grinding and mixing, the mixture is placed in a corundum crucible, and then placed in a high temperature furnace at 5% H 2 +95%N 2 (volume ratio) nitrogen-hydrogen mixed atmosphere at 900° C. for 5 hours, and then slowly cooled to room temperature with the crucible to obtain borate orange phosphor.

[0026] The excitation spectrum of the phosphor powder obtained in this example is a broad spectrum, covering the ultraviolet, violet and blue light regions, and the excitation peak is located near 365nm, indicating that the phosphor powder obtained in this embodiment can be effectively excited by ultraviolet, violet and blue light chips. When the excitation wavelength of the emission spectrum is 365nm, the emission of the fluorescent powder obtained in this embodiment ...

Embodiment 3

[0028] According to KSr 1.9 Zr(BO 3 ) 3 : 0.1Eu 2+ The stoichiometric ratio weighs Na 2 CO 3 , SrCO 3 , ZrO 2 、H 3 BO 3 and Eu 2 o 3 , the molar ratio between them is 0.5:1.9:1:3:0.05. After fully grinding and mixing uniformly, the mixture is placed in a corundum crucible, and then put into a high-temperature furnace and roasted at 1050°C for 3 hours under a CO atmosphere, and then The crucible was slowly cooled to room temperature to obtain a borate orange phosphor.

[0029] The excitation spectrum of the phosphor obtained in this example is a broad spectrum, covering the ultraviolet, violet and blue light regions, and the excitation peak is located near 365nm, indicating that the phosphor obtained in this embodiment can be effectively excited by ultraviolet, violet and blue light chips. When the excitation wavelength of the emission spectrum is 365nm, the emission of the fluorescent powder obtained in this embodiment is the broadband orange light emission of divalen...

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Abstract

The invention discloses a borate orange fluorescent powder for a white light LED and a preparation method thereof. The fluorescent powder has a chemical formula as follows: RSr(2-x)M(BO3)3: xEu2+, wherein x is equal to 0.001 to 0.1; R is Na or K; M is Zr or Hf. During preparation, raw materials are weighed according to the chemical formula RSr(2-x)M(BO3)3: xEu2+ and a stoichiometric ratio; the rawmaterials are respectively inorganic salt of strontium, boric acid, europium oxide, inorganic salt containing R and oxide containing M; x is equal to 0.001 to 0.1; a uniform mixture of the raw materials is sintered in a high-temperature furnace at a reducing atmosphere and then is slowly cooled to a room temperature, so as to obtain the borate orange fluorescent powder. The fluorescent powder hasthe characteristics of good dispersibility, uniform granularity, good chemical stability and heat stability, high luminous efficiency, cheap and easily available raw material and low preparation temperature, with an excitation band covering ultraviolet and blue light zones, and is suitable for serving as an orange fluorescent powder for white light.

Description

technical field [0001] The invention relates to a borate orange fluorescent powder for white LEDs and a preparation method thereof, belonging to the technical field of rare earth luminescent materials. Background technique [0002] White LED is a solid-state semiconductor device that converts electrical energy into white light, also known as semiconductor lighting. It has many advantages such as high efficiency, small size, long life, safety, low voltage, energy saving, and environmental protection. , Fluorescent lamps, and high-pressure gas discharge lamps are the fourth generation of lighting sources, which will be the mainstream products in the future lighting market. [0003] At present, there are various white light LED preparation methods, among which the combination of blue LED chip and yellow fluorescent material, combination of blue LED chip and red and green fluorescent material, and combination of purple LED chip and trichromatic fluorescent material are the three...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/67C09K11/78H01L33/50
CPCC09K11/774H01L33/502Y02B20/00
Inventor 余华季振国苏伟涛陈雷锋钟家松赵红挺
Owner HANGZHOU DIANZI UNIV