Monodisperse spherical white-light fluorescent powder for white-light LED and preparing method of powder

A monodisperse, phosphor technology, used in chemical instruments and methods, luminescent materials, etc., can solve the problems of difficulty in obtaining spherical particles, wide particle size distribution, and large particle size of synthetic powders, and avoid difficulties in powder ratio. Control, good thermal stability of powder, good crystallinity effect

Inactive Publication Date: 2017-05-24
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most commonly used phosphor preparation method is the traditional high-temperature solid-phase method, but this synthesis method has disadvantages such as high reaction temperature, energy consumption, low efficiency, and high eq

Method used

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  • Monodisperse spherical white-light fluorescent powder for white-light LED and preparing method of powder
  • Monodisperse spherical white-light fluorescent powder for white-light LED and preparing method of powder
  • Monodisperse spherical white-light fluorescent powder for white-light LED and preparing method of powder

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0058] Example 1

[0059] A monodisperse spherical white light phosphor for white light LED, the general chemical formula of the monodisperse spherical white light phosphor for white light LED is: (Y 0.991 Eu 0.001 Bi 0.008 ) 2 O 3 .

[0060] A preparation method of monodisperse spherical phosphor for white light LED, comprising the following steps:

[0061] Step 1, preparation

[0062] According to the general chemical formula of the monodisperse spherical white phosphor for white LED (Y 0.991 Eu 0001 Bi 0.008 ) 2 O 3 , according to the stoichiometric ratio, accurately weigh 6.0738g Y (NO 3 ) 3 ·6H 2 O(99.9%), 0.0071g Eu(NO 3 ) 3 ·6H 2 O (99.9%) and 0.0621g Bi (NO 3 ) 3 ·5H 2 0. Mix the weighed raw materials, add 2 L of dilute nitric acid solution with a concentration of 0.027 mol / L and fully dissolve to obtain a raw material mixed solution;

[0063] Step 2, add nitrogen-containing precipitant

[0064] 109.19g of urea was added to the raw material mixed s...

Example Embodiment

[0072] Example 2

[0073] A monodisperse spherical white light phosphor for white light LED, the general chemical formula of the monodisperse spherical white light phosphor for white light LED is: (Y 0.9964 Eu 0.003 Bi 0.0006 ) 2 O 3 .

[0074] A preparation method of monodisperse spherical phosphor for white light LED, comprising the following steps:

[0075] Step 1, preparation

[0076] According to the general chemical formula of the monodisperse spherical white phosphor for white LED (Y 0.9964 Eu 0.003 Bi 0.0006 ) 2 O 3 , respectively accurately weigh 2.2500g Y according to the stoichiometric ratio 2 O 3 (99.99%), 0.0106g Eu 2 O 3 (99.99%) and 0.0058gBi (NO 3 ) 3 ·5H 2 O, mix the raw materials, add 2L of dilute nitric acid solution with a concentration of 0.033mol / L to fully dissolve, and prepare a raw material mixed solution;

[0077] Step 2, add nitrogen-containing precipitant

[0078] 96.096g of urea was added to the raw material mixed solution, stirr...

Example Embodiment

[0091] Example 3

[0092] A monodisperse spherical white light phosphor for white light LED, the general chemical formula of the monodisperse spherical white light phosphor for white light LED is: (Y 0.989 Eu 0.008 Bi 0.003 ) 2 O 3 .

[0093] A preparation method of monodisperse spherical phosphor for white light LED, comprising the following steps:

[0094] Step 1, preparation

[0095] According to the general chemical formula of the monodisperse spherical white phosphor for white LED (Y 0.989 Eu 0.008 Bi 0.003 ) 2 O 3 , respectively accurately weigh 4.4665gY according to the stoichiometric ratio 2 O 3 (99.99%), 0.0563g Eu 2 O 3 (99.99%) and 0.0280g Bi 2 O 3 , mix the raw materials, add 2L of dilute nitric acid solution with a concentration of 0.062mol / L to fully dissolve, and prepare a raw material mixed solution;

[0096] Step 2, add nitrogen-containing precipitant

[0097] 10.51g of urea and 2.00g of ammonium nitrate were added to the raw material mixed s...

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Abstract

The invention provides monodisperse spherical white-light fluorescent powder for a white-light LED and a preparing method of the powder, and belongs to the technical field of rare earth light-emitting materials. The chemical general formula of the white-light fluorescent powder is (Y1-x-y-zGdxEuyBiz)2O3, wherein x is larger than or equal to 0 and smaller than or equal to 0.30, y is larger than or equal to 0.001 and smaller than or equal to 0.01, and z is larger than or equal to 0.0002 and smaller than or equal to 0.008. The preparation method includes the steps that raw materials are weighed, and an acid solution is added to dissolve the raw materials; a nitrogen-containing precipitator is added and stirred, the mixture is heated to 80-98 DEG C, and after white precipitate appears in the solution, the temperature is kept for 60-240 min; after the white precipitate is cooled, centrifugally separated, washed, dried and forged, the monodisperse spherical white-light fluorescent powder for the white-light LED is prepared. The prepared white-light fluorescent powder is single-matrix white-light fluorescent powder, a synthesis method is simple, the forging temperature is low, energy is saved, the yield is high, the repeatability is good, the defects that spectrum re-absorption exists in three-primary-color fluorescent powder and powder matching is difficult to control are effectively avoided, and the problem that light attenuations between multiple phases of fluorescent powder are not consistent is solved.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and in particular relates to a monodisperse spherical white phosphor powder for white LEDs and a preparation method thereof. Background technique [0002] As a new type of solid-state light source, white LED has many advantages such as small size, high luminous efficiency, low energy consumption, long life, no mercury pollution, all solid state, fast response, low working voltage, safety and reliability, etc. Display and other fields have very broad application prospects and market economic benefits, and are expected to become a new generation of green and environmentally friendly lighting sources to replace the existing fluorescent lamps and incandescent lamps, so they have attracted extensive attention from researchers at home and abroad. [0003] At present, there are two main ways to obtain white LEDs by using phosphor conversion: one is to mix blue LED chips with yel...

Claims

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Application Information

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IPC IPC(8): C09K11/78
CPCC09K11/7787
Inventor 李晓东马畅孙旭东张牧李继光朱琦刘绍宏
Owner NORTHEASTERN UNIV
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