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Molybdate-based red fluorescent powder and preparation method thereof

A red phosphor, molybdate technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of pollution, low luminous efficiency of devices, complicated preparation methods, etc., and achieve rich sources, simple and easy preparation methods, and Preparation method flexible effect

Active Publication Date: 2015-01-28
徐州博创建设发展集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the red luminescence of the most important inorganic materials is through Eu 3+ Activated, the commercial red phosphor used by W-LED is mainly Y 2 o 2 S:Eu 3+ , the red phosphor is sulfide, the preparation method is relatively complicated, the volatilization of sulfur will also cause pollution, and the luminous efficiency of the device is relatively low

Method used

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  • Molybdate-based red fluorescent powder and preparation method thereof
  • Molybdate-based red fluorescent powder and preparation method thereof
  • Molybdate-based red fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of Cs 8 Zr 6 o 24 :0.05Eu 3+ : According to the chemical formula Cs 8 Zr 6 o 24 :0.05Eu 3+ , respectively weigh cesium carbonate Cs 2 CO 3 : 2.477 g, europium oxide Eu 2 o 3 : 0.141 g, Zirconia ZrO 2 : 0.247 g, ammonium molybdate (NH 4 ) 6 Mo 7 o 24 -4H 2 O: 2.119 grams, after grinding and mixing in an agate mortar, select the air atmosphere for pre-calcination, the pre-calcination temperature is 300 ° C, the pre-calcination time is 14 hours, then cool to room temperature, take out the sample; the first calcined The raw materials are fully mixed and ground again, and the second pre-calcination is carried out in the air atmosphere. The pre-calcination temperature is 650 ° C, the pre-calcination time is 3 hours, and then cooled to room temperature, and the sample is taken out; finally, the obtained mixture is fully ground again and put In the furnace, it is calcined under the air atmosphere, the calcining temperature is 900° C., and the calcini...

Embodiment 2

[0041] Preparation of Cs 8 Zr 6 o 24 :0.0001Eu 3+ : According to the chemical formula Cs 8 Zr 6 o 24 :0.0001Eu 3+ , respectively weigh cesium nitrate CsNO 3 : 3.116 g, europium oxide Eu 2 o 3 : 0.0003 g, zirconium sulfate tetrahydrate Zr (SO 4 ) 2 -4H 2 O: 0.7109 g, molybdenum oxide MoO 3 : 1.7273 grams, after grinding and mixing in an agate mortar, select the air atmosphere for pre-calcination, the pre-calcination temperature is 500 ° C, the pre-calcination time is 10 hours, then cool to room temperature, take out the sample; the raw material calcined for the first time Thoroughly mix again and grind evenly, carry out the second pre-calcination in the air atmosphere, the pre-calcination temperature is 650 ° C, the pre-calcination time is 7 hours, then cool to room temperature, take out the sample; finally the obtained mixture is fully ground again and placed in the muffle furnace , calcined in an air atmosphere, the calcined temperature is 650 ° C, and the calcin...

Embodiment 3

[0043] Preparation of Rb 8 Zr 6 o 24 :0.01Eu 3+ : According to the chemical formula Rb 8 Zr 6 o 24 :0.01Eu 3+ , respectively weigh rubidium carbonate Rb 2 CO 3 : 1.829 g, europium nitrate Eu (NO 3 ) 3 ·6H 2 O: 0.0714 g, zirconia ZrO 2 : 0.2465 g, ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O: 2.119 grams, after grinding and mixing uniformly in an agate mortar, select the air atmosphere for pre-calcination, the pre-calcination temperature is 650 ° C, the pre-calcination time is 7 hours, then cool to room temperature, take out the sample; the pre-calcined raw materials are again Thoroughly mix and grind evenly, calcined in an air atmosphere in a muffle furnace, the calcining temperature is 800°C, and the calcining time is 9 hours, and the powdered molybdate-based red phosphor is obtained. Its microstructure, excitation spectrum, and luminescence Spectrum and decay curve are similar to Example 1.

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Abstract

The invention discloses molybdate-based red fluorescent powder and a preparation method thereof. The molybdate-based red fluorescent powder has a chemical formula of M8ZrMo6O24: xEu<3+>, wherein an active ion is Eu<3+>, M represents one of alkali metal ions Cs<+>, Rb<+>, K<+> and Na<+>, x represents a mole percentage coefficient of Eu<3+> replacing M and x is greater than or equal to 0.0001 and is less than or equal to 0.1. The molybdate-based red fluorescent powder has uniform granularity, high luminescence efficiency, high degree of crystallization and high degree of pure red fluroescence color. The preparation method has simple and flexible processes, realizes mixing of compounds of elements required by red phosphor powder according to a ratio, high-temperature calcining or chemical solution dissolution and then calcination for material preparation, and adopts raw materials having abundant sources and low prices. The molybdate-based red fluorescent powder has strong excitability in a wavelength range of 370-410nm, has emission wavelength very same to that of a near ultraviolet LED chip, can emit bright red fluorescence under the excitation of near ultraviolet and has main emission wavelength of 614nm.

Description

technical field [0001] The invention relates to a fluorescent material and a preparation method thereof, in particular to a molybdate-based red fluorescent powder and a preparation method thereof, belonging to the technical field of luminescent materials. Background technique [0002] White Light Emitting Diode (W-LED) is an energy conversion device that converts electrical energy into light energy. The general way to realize it is to coat a fluorescent material on a light-emitting semiconductor chip, and the fluorescent material is excited by semiconductor light emission. , can emit various kinds of fluorescence, and the emitted light is mixed with the inherent light of the semiconductor chip to obtain a white light source; white light-emitting diodes have low operating voltage, power saving, stable performance, long device life, strong vibration resistance, and overall The device has the advantages of light weight and small size, fast luminous response, and adjustable chro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/68
Inventor 乔学斌章健周天元张乐杨浩唐定远
Owner 徐州博创建设发展集团有限公司
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