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Preparation of europium gadolinium yttrium oxide red fluorescent powder

A red phosphor, yttrium oxide technology, applied in the direction of color-changing fluorescent materials, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of large chromaticity drift and fast decay of powder luminescence, and achieve good color purity and small light decay. , high brightness effect

Inactive Publication Date: 2009-05-20
CAIHONG GRP ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commercial yttrium europium oxide generally has the problem of fast luminous attenuation and large chromaticity drift under certain temperature and high load excitation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] First set the mass percentage to 60% of Y 2 o 3 , 39% Gd 2 o 3 , 1% Eu 2 o 3 Pass through a 100-mesh sieve first, then put it into a mixing bottle, mix powder: balls at a ratio of 2:1, the diameter of the balls is 1-5 cm, and ball mill for 18 hours to get evenly mixed phosphor raw materials. Put the homogeneously mixed phosphor raw materials into an alumina crucible, put the alumina crucible into a high-temperature firing furnace, and burn it at a high temperature of 900°C for 10 hours. The cooled fired product is the red phosphor powder primary products. After the fired phosphor powder is crushed, pass through a 100-mesh sieve, put it into a ball mill tank, mix the powder: water: dispersing ball at a mass ratio of 1:2:2, and the diameter of the dispersing ball is 1.5-2.5mm. After 0.5 hours Dispersed by ball milling, the disintegrated powder slurry passed through a 500-mesh sieve, and the sieve residue on the 500-mesh sieve was removed. The dispersed powder slurry...

Embodiment 2

[0016] First set the mass percentage to 68% of Y 2 o 3 , 30% Gd 2 o 3 , 2% Eu 2 o 3 Mix according to the method of Example 1 for 12 hours, put it into a firing furnace, and burn it at a high temperature of 1000°C for 8 hours. The cooled fired product is ball-milled and dispersed for 1.0 hour according to the method of Example 1, and the dispersed powder The slurry was washed with water three times, then suction filtered, and dried at 120°C for 8 hours, and the dried powder was passed through a 100-mesh sieve to obtain the red fluorescent powder. The powder has a brightness of 98 and a particle size of 6.2u.

Embodiment 3

[0018] First set the mass percentage to 70% of Y 2 o 3 , 27% Gd 2 o 3 , 3% Eu 2 o 3 Mix according to the method of Example 1 for 20 hours, put it into a firing furnace, and burn it at a high temperature of 1100°C for 7 hours. The cooled fired product is ball milled and dispersed for 1.5 hours according to the method of Example 1. The dispersed powder The slurry was washed with water twice, then suction filtered, and dried at 110°C for 14 hours, and the dried powder was passed through a 100-mesh sieve to obtain the red fluorescent powder. The powder has a brightness of 101 and a particle size of 5.8u.

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PUM

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Abstract

The invention discloses a preparation method of yttria gadolinium-europium red fluorescent powder, which comprises the steps of: mixing 60-80 weight percent of Y2O3, 10-40 weight percent of Gd2O3 and 1-10 weight percent of Eu2O3 by a dry method after the materials are screened by a 100-mesh screen, putting the uniformly mixed materials in a crucible, firing the materials for 4-10 hours under the high temperature of 900-1400 DEG C, screening the fired fluorescent powder blocks by the 100-mesh screen, scattering the powder into slurry by a wet method, washing the scattered slurry for 2-5 times, then filtering and drying the slurry for 8-24 hours at 110-120 DEG C, and screening the dried powder by the 100-mesh screen to obtain the yttria gadolinium-europium red fluorescent powder.

Description

technical field [0001] The invention relates to a preparation method of red fluorescent powder, in particular to a preparation method of ultraviolet excited yttrium oxide gadolinium europium red fluorescent powder. Background technique [0002] UV excitation Y 2 o 3 : What the Eu formula represents is a kind of red fluorescent powder, and the research of yttrium oxide europium red fluorescent powder has a long history, which involves high-temperature solid-phase synthesis, sol-gel method, combustion synthesis and microwave synthesis. At present, the high-temperature solid-phase synthesis method is the most widely used because of its simple equipment, stable production process, and high yield. In recent years, with the rapid development of technology, yttrium europium oxide red phosphor has been widely used due to its high luminance, good color purity and stability under vacuum ultraviolet light. At present, the commercial yttrium europium oxide generally has the problem o...

Claims

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Application Information

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IPC IPC(8): C01F17/00C09K9/00
Inventor 樊钊锋高原何海龙贾宏平
Owner CAIHONG GRP ELECTRONICS CO LTD
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