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Rare-earth red fluorescent material and method for preparing same

A technology of red fluorescent and fluorescent materials, which is applied in the field of fluorescent powder, can solve the problems of poor chemical stability of sulfide fluorescent powder, poor color balance of white light output, and decreased luminous efficiency of fluorescent materials, etc., and achieves environmental friendliness, easy operation, and simple preparation method Effect

Inactive Publication Date: 2011-09-21
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above materials suffer from at least three disadvantages: firstly, the luminous efficiency of fluorescent materials drops rapidly when the color temperature is lowered; secondly, the white light output associated with such devices has a poor color balance; finally, in the red region of the visible spectrum The output light efficiency is severely flawed (above 600nm)
However, the commercial application of red phosphors for white LEDs is limited to Eu 3+ activated sulfide
This kind of sulfide phosphor has poor chemical stability and low luminous efficiency, especially when excited by light from ultraviolet to long wave direction.

Method used

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  • Rare-earth red fluorescent material and method for preparing same
  • Rare-earth red fluorescent material and method for preparing same
  • Rare-earth red fluorescent material and method for preparing same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh calcium oxide (CaO) 0.1514g, strontium carbonate (SrCO 3 )0.1617g, europium oxide (Eu 2 o 3 ) 0.0704g, gadolinium oxide (Gd 2 o 3 ) 0.7499g, molybdenum oxide (MoO 3 )0.2879g, tungsten oxide (WO 3 ) 0.6956g, mixed and ground evenly, dried in a desiccator for 30min, then pre-calcined at 500-600°C for 4h, then ground to the required amount of solid particles, heated to 1100°C in air, and calcined at constant temperature for 4h, then Naturally cooled in air, the samples were ground to the nanoscale. At room temperature, pour the powder into a dilute acid solution containing 1% to 3%, stir it ultrasonically for 1 to 3 hours, then filter it statically, wash it with deionized water several times, and dry it in an oven at 110°C. Red Phosphor Powder Ca 0.60 Sr 0.16 Eu 0.08 Gd 0.08 (MoO 4 ) 0.4 (WO 4 ) 0.6 .

Embodiment 2

[0035] Weigh 0.1514g of CaO, SrCO 3 0.2510g, Eu 2 o 3 0.0704g, samarium oxide (Sm 2 o 3 )0.0177g, and a certain amount of WO 3 and MoO 3 , grind and mix evenly, dry in a desiccator for 30min, then pre-calcine at 500-600°C for 2-5h, then grind until the particle size of the solid particles reaches the required amount, heat to 1100°C in the air, calcinate at a constant temperature for 4h, and then Natural cooling in the air, sampling and grinding to the nanometer level. At room temperature, pour the powder into a dilute acid solution containing 1% to 3%, adjust the pH of the solution to 6.5 to 8.0, stir it ultrasonically for 1.5 to 3 hours, filter it statically, wash it with deionized water for several times, and put it in an oven drying at 130°C to obtain red phosphor Ca 0.54 Sr 0.31 Eu 0.08 SM 0.02 (MoO 4 ) x (WO 4 ) 1-x (x=0, 0.2, 0.4, 0.6, 0.8, 1.0).

Embodiment 3

[0037] Weigh 0.1514g of CaO, SrCO 3 0.1617g, Eu 2 o 3 0.0704g, MoO 3 0.2879g, WO 3 0.6956g, lanthanum oxide (La 2 o 3 ) 0.0625g, ground and mixed evenly, dried in a desiccator for 30min, then pre-calcined at 500-600°C for 2-5h, then ground to the required amount of solid particles, heated to 1100°C in air, and calcined at a constant temperature 4h, then cooled naturally in the air, sampled, and ground to the nanoscale. At room temperature, pour the powder into a dilute acid solution containing 1% to 3%, adjust the pH of the solution to neutral, stir ultrasonically for 1 to 3 hours, then filter it statically, wash it with deionized water for several times, and put it in an oven Dry at 110°C to obtain red phosphor Ca 0.54 Sr 0.22 Eu 0.08 La 0.08 (MoO 4 ) 0.4 (WO 4 ) 0.6 .

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Abstract

The present invention discloses a rare earth red fluorescence material and a preparation method thereof and relates to a fluorescence powder. The chemical measurement formulas of the fluorescence powder are Ax(MoO4)y(WO4)1-y:zEu<3+>, zB<3+> and AxMO4:yEu<3+>, zB<3+>. In the preparation method, Ca, Sr, Ba, Mg, Zn, Mo, W, Cr, V, La, Gd, Sm, Y, Na, K, oxide of Li, carbonate or nitrate are used as raw materials and are weighted according to the composition proportion; the raw materials are grinded, stirred uniformly, preheated, grinded uniformly again and sintered at 700-1400 DEG C; at the room temperature, the powder is poured in dilute acid, stirred through supersonic wave, put statically for filtering, washed with deionized water, and then put in an oven to be dried. Thus, the red fluorescence material is obtained. The fluorescence powder of the invention is provided with stable chemical performance. The preparation method of the fluorescence powder is simple, operated easily and environmental friendly.

Description

technical field [0001] The invention relates to a fluorescent powder, in particular to a photoluminescent red fluorescent powder with a mono- or polyacid salt as a matrix and a preparation method thereof. Background technique [0002] Since the birth of the first commercial white LED (Light Emitting Diode), due to its small size, long life, environmental friendliness and high luminous efficiency, it has been known as the fourth generation of lighting sources. Since light-converting LEDs are the mainstream of solid white lighting development, light-converting materials have become the focus of research. In the past few years, the excellent properties of rare earth molybdates have attracted great interest in many aspects, such as GaN (gallium nitride)-based semiconductor materials synthesized by solid-state reactions, and breakthroughs have been made in luminous efficiency. Progress, GaN-based diodes emit bright violet-blue light, which can be used to stimulate long-wavelengt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78
Inventor 曹发斌孙盈建田彦文陈永杰肖林久田玉新刘云义
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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