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A kind of single-phase fluorescent powder for white light LED and preparation method thereof

A phosphor, a single technology, applied in the field of single-phase phosphor for white LED and its preparation, can solve the problems of low service life, low luminous efficiency, high energy consumption, etc., to reduce energy loss and improve luminous efficiency , The effect of simple operation process

Inactive Publication Date: 2019-05-24
ZHONGSHAN POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these commercial phosphors have some major defects, such as poor matching with ultraviolet / near-ultraviolet LED chips (so that the excitation efficiency is not high and the luminous efficiency is not high), and the service life is low (mainly due to chemical Poor stability and thermal stability), high synthesis process temperature (so energy consumption is large, and production operation is more dangerous) and other defects

Method used

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  • A kind of single-phase fluorescent powder for white light LED and preparation method thereof
  • A kind of single-phase fluorescent powder for white light LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]The single-phase phosphor powder for white light LED in this embodiment has a composition expression of Sr 0.9 MgSi 1.1 o 8 :(0.05Ce 3+ 0.06Dy 3+ ). The emission wavelength coverage of the phosphor powder is 450-650 nm, and the average particle size is 1-5 μm.

[0036] Prepare according to the following process:

[0037] (1) 1 part of Ce(NO 3 ) 3 , 1 part of Dy(NO 3 ) 3 , 1 part of Sr(NO 3 ) 2 Fully dissolved together to form a mixed solution with a mass fraction of 1%;

[0038] (2) immerse 100 parts of Na-montmorillonite with a purity of 99% in the mixed solution prepared in (1), and then fully dry at 150° C. to obtain a loaded powder;

[0039] (3) Calcining the loaded powder prepared in (2) at 400° C. for 1 h, then raising the temperature to 800° C. and calcining for 3 h to obtain single-phase phosphor A for white light LED.

Embodiment 2

[0041] The single-phase phosphor powder for white light LED in this embodiment has a composition expression of Sr 0.7 MgSi 1.4 o 8 :(0.03Ce 3+ 0.02Dy 3+ ). The emission wavelength coverage of the phosphor powder is 450-650 nm, and the average particle size is 1-5 μm.

[0042] Prepare according to the following process:

[0043] (1) 0.5 part of Ce(NO 3 ) 3 , 0.5 Ce 2 (SO 4 ) 3 , 0.5 parts Dy(NO 3 ) 3 , 0.5 Dy 2 (SO 4 ) 3 , 0.5 parts of Sr(NO 3 ) 2 , 0.5 parts of SrSO 4 Fully dissolved together to form a mixed solution with a mass fraction of 0.5%;

[0044] (2) 80 parts of Na-montmorillonite and 70 parts of Na-hectorite (the purity of Na-montmorillonite and Na-hectorite are all 99%) are jointly impregnated in the mixed solution prepared by (1), and then Fully dry at 200°C to obtain loaded powder;

[0045] (3) Calcining the supported powder prepared in (2) at 600° C. for 2 hours, then raising the temperature to 900° C. and calcining for 5 hours to obtain a sin...

Embodiment 3

[0047] The single-phase phosphor powder for white light LED in this embodiment has a composition expression of Sr 1.9 MgSi 1.5 o 8 :(0.06Ce 3+ 0.07Dy 3+ ). The emission wavelength coverage of the phosphor powder is 450-650 nm, and the average particle size is 1-5 μm.

[0048] Prepare according to the following process:

[0049] (1) 0.5 part of Ce(NO 3 ) 3 , 0.5 Ce 2 (SO 4 ) 3 , 0.5 parts CeCl 3 , 0.5 parts Dy(NO 3 ) 3 , 0.5 Dy 2 (SO 4 ) 3 , 0.5 parts of DyCl 3 , 0.5 parts of Sr(NO 3 ) 2 , 0.5 parts of SrSO 4 , 0.5 parts of SrCl 2 Fully dissolved together to form a mixed solution with a mass fraction of 1.5%;

[0050] (2) 100 parts of Na-montmorillonite and 100 parts of Na-hectorite (Na-montmorillonite and Na-hectorite purity are all 99%) are jointly impregnated in the mixed solution prepared in (1), and then Fully dry at 180°C to obtain loaded powder;

[0051] (3) Calcining the loaded powder prepared in (2) at 500° C. for 2 hours, then raising the temper...

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Abstract

The invention belongs to the technical field of LED phosphor and discloses single-phase phosphor for a white LED. The composition expression of the single-phase phosphor is SraMgSibO8: (xCe <3+> .yDy<3+>), wherein a is larger than 0 and smaller than 3, b is larger than 1 and smaller than or equal to 2, x is larger than 0 and smaller than 0.1, and y larger than 0 and smaller than 0.1. The invention also discloses a preparation method of the phosphor. The preparation method comprises the steps as follows: S1, dissolving soluble cerium salt, soluble dysprosium salt and soluble strontium salt together to form a mixed solution; S2, immersing the smectite minerals in the mixed solution prepared in S1, sufficiently drying the mixed solution at 50-200 DEG C to obtain supported powder; S3, calcining the supported powder prepared in S2 at 400-600 DEG C for 1-2 h, raising the temperature to 800-900 DEG C and calcining the supported powder for 3-5 h to obtain the single-phase phosphor. The synthetic process is relatively mild, energy consumption is low, and production is safer; the prepared phosphor has high luminous efficiency, good color rendering property, long service life and quite broad application prospect and potential.

Description

technical field [0001] The invention belongs to the technical field of LED fluorescent powder, in particular to a single-phase fluorescent powder for white LEDs and a preparation method thereof. Background technique [0002] White light LED is a new generation of green lighting source that attracts attention in the 21st century, and has broad market and application prospects. There are many schemes to realize white LED, generally there are three types: (1) blue LED + yellow phosphor powder that can be effectively excited by blue LED; (2) blue LED + red / green phosphor powder that can be effectively excited by blue LED; (3) Ultraviolet / near ultraviolet LED+phosphor powder that can be effectively excited by ultraviolet / violet LED. [0003] From the perspective of the three ways of realizing LED of fluorescent conversion technology, the development process of LED chips is from blue LED chips to ultraviolet / near ultraviolet LED chips. Compared with blue LED chips, ultraviolet / ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59H01L33/50
CPCC09K11/7774H01L33/502H01L2933/0041
Inventor 王俊聂建华邓之鹤杨振宇
Owner ZHONGSHAN POLYTECHNIC
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