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Emission peak-adjustable phosphate fluorescent powder for white-light LED (Light-Emitting Diode) and preparation method thereof

An emission peak, phosphate technology, applied in the field of fluorescent materials, can solve the problems of difficult to achieve device color rendering index and hinder the development of white light LED devices, and achieve the effect of wide excitation spectrum, high color rendering index and good luminous performance

Inactive Publication Date: 2014-05-07
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition YAG:Ce 3+ The half-peak width of phosphor is narrow, generally around 110nm, which makes it difficult for the device to achieve a color rendering index of more than 80
Many of the above shortcomings have hindered the development of white light LED devices

Method used

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  • Emission peak-adjustable phosphate fluorescent powder for white-light LED (Light-Emitting Diode) and preparation method thereof
  • Emission peak-adjustable phosphate fluorescent powder for white-light LED (Light-Emitting Diode) and preparation method thereof
  • Emission peak-adjustable phosphate fluorescent powder for white-light LED (Light-Emitting Diode) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Implementation Example 1: Ca 8.991 La(PO 4 ) 7 :0.001Eu 2+ preparation of

[0030] First, according to the chemical formula Ca 9(1-x) La(PO 4 ) 7 :xEu 2+ The stoichiometric ratio of the reaction raw materials EuO, CaCO 3 , La 2 o 3 , (NH 4 ) 2 H(PO 4 ) in a molar ratio of 0.001:8.991:0.5:7; grind them in a mortar for 2 to 3 hours, and mix them thoroughly. Then put it into a crucible, compact it, and put it in an air high-temperature furnace, and sinter it at 1200°C for 8 hours; take it out after cooling, grind it to a certain particle size, put it into a crucible, and then reduce it in a reduction furnace at 1000°C for 8 hours; Cool to room temperature in a reducing atmosphere, take out the burnt material from the reduction furnace, crush it, wash it with deionized water, and bake it in an oven at 120-150°C for 6-8 hours to obtain the phosphate fluorescence pink.

Embodiment 2

[0031] Implementation Example 2: Ca 8.973 La(PO 4 ) 7 :0.003Eu 2+ preparation of

[0032] First, according to the chemical formula Ca 9(1-x) La(PO 4 ) 7 :xEu 2+ The stoichiometric ratio of the reaction raw materials EuO, CaCO 3 , La 2 o 3 , (NH 4 ) 2 H(PO 4 ) in a molar ratio of 0.003:8.973:0.5:7; grind them in a mortar for 2 to 3 hours, and mix them thoroughly. Then put it into a crucible, compact it, and put it in an air high-temperature furnace, and sinter it at 1200°C for 8 hours; take it out after cooling, grind it to a certain particle size, put it into a crucible, and then reduce it in a reduction furnace at 1000°C for 8 hours; Cool to room temperature in a reducing atmosphere, take out the burnt material from the reduction furnace, crush it, wash it with deionized water, and bake it in an oven at 120-150°C for 6-8 hours to obtain the phosphate fluorescence pink.

Embodiment 3

[0033] Implementation Example 3: Ca 8.955 La(PO 4 ) 7 :0.005Eu 2+ preparation of

[0034] First, according to the chemical formula Ca 9(1-x) La(PO 4 ) 7 :xEu 2+ The stoichiometric ratio of the reaction raw materials EuO, CaCO 3 , La 2 o 3 , (NH 4 ) 2 H(PO 4 ) in a molar ratio of 0.005:8.955:0.5:7; they were ground in a mortar for 2 to 3 hours, and thoroughly mixed. Then put it into a crucible, compact it, and put it in an air high-temperature furnace, and sinter it at 1200°C for 8 hours; take it out after cooling, grind it to a certain particle size, put it into a crucible, and then reduce it in a reduction furnace at 1000°C for 8 hours; Cool to room temperature in a reducing atmosphere, take out the burnt material from the reduction furnace, crush it, wash it with deionized water, and bake it in an oven at 120-150°C for 6-8 hours to obtain the phosphate fluorescence pink.

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Abstract

The invention belongs to the technical field of rare-earth light-emitting materials, relates to emission peak-adjustable phosphate fluorescent powder for a white-light LED (Light-Emitting Diode) and a preparation method thereof. Fluorescent powder for the white-light LED, which is stable in chemical property, high in light-emitting performance, high in physical phase purity and adjustable in the emission peak from green light to red light when being excited by near ultraviolet light, purple light and blue light and can be applied to the white-light LED excited by using a blue-light LED chip. The chemical components of the fluorescent powder can be shown as a chemical formula, namely, Ca9(1-x-y)-La(PO4)7:xEu<2+>,yMn<2+>, wherein x is more than or equal to 0.002 and less than or equal to 0.2, and y is more than or equal 0.002 and less than or equal to 0.2. The fluorescent powder can be used for exciting white light together with blue fluorescent powder BaMgAl10O17:xEu<2+>. An encapsulated device can reach a white-light area with low color temperature, warm tone (CCT is less than or equal 5,000K), high color rendering index (CRI, RA is more than or equal to 90) and a color coordinate being up to CIE1931. The preparation method is simple and easy to operate, contributes to saving energy and time, and has extremely good application prospect in the field of solid illumination.

Description

technical field [0001] The invention relates to a phosphate fluorescent powder with adjustable emission peaks for white LEDs and a preparation method thereof, which can be applied to ultraviolet-near ultraviolet white LEDs and belongs to the technical field of fluorescent materials. Background technique [0002] White light-emitting diode (LED) is called the fourth generation of lighting source. As a new generation of solid light source, in addition to overcoming the shortcomings of traditional incandescent and fluorescent lamps such as high energy consumption, fragility, and pollution, it also has small size and environmental protection. , fast response, long life, planar packaging, high luminous intensity, high efficiency, energy saving, vibration resistance, low voltage drive, and no environmental pollution, etc., so it has advantages in display, background light source, signal light, lighting and other fields Wide range of applications. Especially in recent years, with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/81
Inventor 魏健沈常宇刘桦楠路艳芳陈德宝金尚忠
Owner CHINA JILIANG UNIV
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