Red phosphor and preparation method thereof

A technology of red phosphor powder and chemical composition, applied in chemical instruments and methods, luminescent materials, etc., can solve the problem of mismatching color coordinates, and achieve the effects of good color coordinates, easy operation and high emission intensity

Inactive Publication Date: 2010-04-28
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of mismatching color coordinates existing in commercial red phosphors, and to provide a red phosphor for PDPs and mercury-free fluorescent lamps with high emission intensity and more suitable color coordinates

Method used

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  • Red phosphor and preparation method thereof
  • Red phosphor and preparation method thereof
  • Red phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh lanthanum trioxide (La 2 o 3 )0.5241g, europium oxide (Eu 2 o 3 ) 0.0205g, calcium carbonate (CaCO 3 ) 1.0009g, sodium carbonate (Na 2 CO 3 ) 0.1943g, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 1.1504g, ammonium fluoride (NH 4 F) 0.1729g, fully ground in an agate mortar and mixed evenly, sintered at 1050°C for 4 hours in a carbon monoxide atmosphere, cooled to room temperature, and the sample was taken out and ground to finally obtain the product.

Embodiment 2

[0022] Weigh gadolinium trioxide (Gd 2 o 3 )0.5830g, europium oxide (Eu 2 o 3 ) 0.0205g, calcium carbonate (CaCO 3 ) 1.0009g, sodium carbonate (Na 2 CO 3 ) 0.1943g, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 1.1504g, ammonium fluoride (NH 4 F) 0.1729g, fully ground in an agate mortar and mixed evenly, sintered at 1050°C for 4 hours in a carbon monoxide atmosphere, cooled to room temperature, and the sample was taken out and ground to finally obtain the product.

Embodiment 3

[0024] Weigh diyttrium trioxide (Y 2 o 3 )0.3632g, europium oxide (Eu 2 o 3 ) 0.0205g, calcium carbonate (CaCO 3 ) 1.0009g, sodium carbonate (Na 2 CO 3 ) 0.1943g, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 1.1504g, ammonium fluoride (NH 4 F) 0.1729g, fully ground in an agate mortar and mixed evenly, sintered at 1050°C for 4 hours in a carbon monoxide atmosphere, cooled to room temperature, and the sample was taken out and ground to finally obtain the product.

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Abstract

The invention discloses a red phosphor and a preparation method thereof, the red phosphor has the chemical formula: M6Ln2-xEuxR2(PO4)6F2, wherein M is at least one of the alkaline earth metal ion group consisting of Ca2+, Sr2+ and Ba2+; Ln is rare earth metal ion selected from the group consisting of La3+, Gd3+ and Y3+; R is the alkaline earth metal ion selected from the group consisting of Na+ and K+; x is the coefficient of mole percent of doping element Eu in rare earth element Ln and is not less than 0.01 but not more than 0.90. Rare earth oxide, ammonium dihydrogen phosphate, alkaline (earth) metal carbonate and ammonium fluoride are mixed and then sintered in the atmosphere of CO at 950 DEG C or 1050 DEG C for 2 to 4 hours, and the product is obtained by grinding the sintered mixture. The resultant luminescent material can effectively absorb 147nm and 172nm vacuum ultraviolet lights, generate green emission with main emission peak at 618nm, and the emission intensity excited at 172nm is stronger than PDP red phosphor (Y, Gd) BO3:Eu3+(YGB). The resultant phosphor has the main emission at 618nm, which is better than chromaticity coordinate emitted at YGB 593nm. The resultant phosphor has high luminous intensity, high color purity and good chromaticity coordinate, and is suitable for serving as red light portion of the luminescent material for PDP and mercury-free fluorescent lamp.

Description

technical field [0001] The invention relates to a fluorescent powder which can be used in plasma flat panel display (Plasma Display Panel) and mercury-free fluorescent lamp (Hg-free luminescence lamps) and its preparation technology. Background technique [0002] Plasma Display Panel (PDP for short) is one of the main large-screen display technologies at present. PDP is a kind of three-color fluorescent powder that is excited by ultraviolet rays (mainly at 147 nanometers (nm) and 172 nanometers (nm)) generated by plasma discharge of a xenon (Xe)-based rare gas mixture under the control of a drive circuit. Flat panel display technology. [0003] Fluorescent lamps and cold-cathode fluorescent lamps are the main light sources for indoor lighting and backlights for liquid crystal devices, but the mercury used to provide high-voltage plasma excited by electrons is a volatile liquid heavy metal that is harmful to the environment. The application will be gradually restricted and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/86
Inventor 梁宏斌谢木标倪海勇苏锵
Owner SUN YAT SEN UNIV
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