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Production of zinc sulfide electroluminescent fluorescent powder

A technology of phosphor and zinc sulfide, applied in the field of preparation of zinc sulfide electro-phosphor powder, can solve the problems of unfavorable electro-fluorescence lifetime, brightness, harmfulness, etc., and achieve the effect of easy selection and low eutectic point

Active Publication Date: 2009-10-21
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These crystal forms produced at high temperature cannot be fully converted into phosphors with high electroluminescent activity by grinding and annealing, and mechanical grinding is often harmful, which is not conducive to maintaining high-quality electroluminescence lifetime and brightness

Method used

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  • Production of zinc sulfide electroluminescent fluorescent powder
  • Production of zinc sulfide electroluminescent fluorescent powder
  • Production of zinc sulfide electroluminescent fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The raw materials ZnS, CuSO 4 (600ppm) and flux (8% by weight of ZnS, Na 2 S: MgCl 2 : BaCl 2 : S=1:2:1:1) were mixed by ball milling, placed in a capped quartz crucible, calcined in a furnace at 700°C for 3 hours, cooled to room temperature, then washed with deionized water and filtered to remove flux, and baked in an oven Dry and sieve to obtain a powder. The obtained powder was ball milled for 2 hours, annealed at 750°C for 2 hours, cooled in air, washed with dilute hydrochloric acid, deionized water, sodium cyanide and deionized water, and finally filtered, dried and sieved to obtain the finished product green Phosphor. The test results are shown in Table 1.

Embodiment 2

[0017] The raw materials ZnS, CuSO 4 (600ppm) and flux (8% by weight of ZnS, Na 2 S: MgCl 2 : BaCl 2 : S=1:2:2:1) were mixed by ball milling, placed in a covered quartz crucible, calcined in a furnace at 700°C for 5 hours, cooled to room temperature, then washed with deionized water and filtered to remove the flux, and dried in an oven , and sieve to obtain powder. The obtained powder was ball milled for 2 hours, annealed at 750°C for 2 hours, cooled in air, washed with dilute hydrochloric acid, deionized water, sodium cyanide and deionized water, and finally filtered, dried and sieved to obtain the finished product green Phosphor. The test results are shown in Table 1.

Embodiment 3

[0019] The raw materials ZnS, CuSO 4 (600ppm) and flux (8% by weight of ZnS, Na 2 S: MgCl 2 : BaCl 2 : S=1:2:2:1) were mixed by ball milling, placed in a covered quartz crucible, calcined in a furnace at 800°C for 3 hours, then cooled to room temperature, then washed with deionized water and filtered to remove the flux, and placed in an oven Dry and sieve to obtain powder. The obtained powder was ball milled for 2 hours, annealed at 750°C for 2 hours, cooled in air, washed with dilute hydrochloric acid, deionized water, sodium cyanide and deionized water, and finally filtered, dried and sieved to obtain the finished product green Phosphor. The test results are shown in Table 1.

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Abstract

The invention relates to a preparation method of zinc sulfide electroluminescent powder, which is characterized in that zinc sulfide, activator and flux are fully ball-milled and mixed, and the first solid-phase reaction is carried out at 500-900 ° C, and then cooled, washed and dried dry; then ball mill the obtained powder; then carry out the second solid phase reaction annealing, and obtain the finished fluorescent powder through cooling, washing, drying and sieving; the composition and molar ratio of the flux are NaCl:MgBr2 : BaBr2: S=1: 0.5~3: 0.5~3: 0.5~5; the amount used is 5% to 15% of the ZnS raw material quality; the activator is Cu, Mn or a combination of both, and the amount of Cu added is 200-900ppm, and the amount of Mn added is 1-10% of the mass of ZnS; the annealing temperature for the second solid phase reaction is 500-900°C. The growth temperature of the prepared ZnS electroluminescent powder is lowered to 500-900° C., which greatly facilitates the controllability of particle morphology and composition. The performance of the prepared fluorescent powder is significantly better than that of the existing method, and the energy consumption is greatly reduced.

Description

technical field [0001] The invention relates to a preparation method of zinc sulfide electroluminescent powder, belonging to the field of zinc sulfide phosphor preparation. Background technique [0002] In the information age and electronic age, flat-panel display devices play a vital role as an essential interface for human-computer communication. Among many real display technologies, electroluminescent display technology achieves the purpose of light emission and display by driving the semiconductor film with current. This display technology has the advantages of thinner, lighter, active luminescence, wide viewing angle, high definition, fast response, low energy consumption, excellent low temperature and shock resistance, potential low manufacturing cost, flexible and environmentally friendly design and other information display and device manufacturing. Almost all the excellent features requested. Electroluminescent display technology is considered by the industry to b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/56H05B33/14
Inventor 黄富强王文邓
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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