The invention relates to a preparation method of dc electroluminescent powder material

Devices made of dc electroluminescent powder materials have been developed in recent years. It has a solid, flat, thin, light weight, the vacuum, no radiation damage and the advantages of low cost, a new type of light-emitting display is a very practical and low brightness illumination device, its core is a kind of ZnS, Mn, Cu administered powder type semiconductor materials (Zhou Lianxiang, "the Chinese society of luminescence in collection of the 1988 national conference on luminescence application, 1988.11, chongqing, 22 ~ 24) the biggest drawback of this kind of material is luminous efficiency is low, only 0.5 lumens per watt, cannot satisfy the use requirement. The purpose of the present invention is to provide a high-efficiency dc electroluminescent powder material. The invention is characterized in that high purity zinc sulfide (ZnS) powder raw material is selected as the substrate and mixed with a certain amount of manganese (Mn2+) ions and any of the ions in trivalent Al3+, B3+, Y3+, Ga3+ and In3+. The present invention is implemented in high purity (spectrum pure zinc sulfide (ZnS) administered powder raw material, by adding Mn2 + ions in the form of MnCl2 aqueous solution (activator), make the Mn2 + ion in MnS matrix of weight percentage of 0.4% to 1%, and then mixed with a certain amount of trivalent ions, mixed with trivalent ions were intended to limit the chloride ion (from MnCl2) on the adverse effects of light, trivalent ions can be B3 +, Al3 +, Y3 + and Ga3 +, In3 + either of its weight in ZnS substrates administered percentage of 0.02% to 0.1%, After mixing evenly, drying and carefully grinding, it is put into quartz tube and burned in vacuum or H2S atmosphere or HCl+S atmosphere. The burning temperature is controlled at 800-1000 ℃, and the burning time is 1-3 hours. ZnSMn·Al electroluminescent powder was obtained after treatment, low temperature copper coating and screening (sorting) process aimed at homogenizing the particles, and drying at a constant temperature of 60-80 ℃. According to the direct current electroluminescence material prepared by the invention, the DCEL screen produced has an effective luminescence area of 4.40cm2. The ZnSMn·Cu powder type ELECTROluminescent material is prepared according to the conventional method, and the DCEL screen is prepared by using the same process conditions as the present invention, with an effective luminescent area of 4.35cm2. The DCEL screen made from the above two materials is connected in parallel, and after the DCEL screen is lined with exactly the same DC voltage, the experimental results (measured by silicon photocell, composite galvanometer and digital multimeter, etc.) can be obtained by excitation with 150V DC voltage. Table id="table1"num="001">150 volts dc voltage sample parameter DCEL screen znsmn. CuDCEL screen prepared by the present invention initial relative luminance value 227218120 hours relative luminance value 150138 relative luminance efficiency 0.2630.136 efficiency ratio (subject to ZnS: mn. Cu) 2.021 it can be clearly seen from the above table that when the DCEL screen made of the material of the invention and the DCEL screen made of conventional ZnSMn·Cu material are excited for 120 hours, the luminous efficiency of the former is about 90% higher than that of the latter. At 90 hours, the luminance of the former is higher than that of the conventional ZnSMn·Cu material screen both at the initial excitation and after hundreds of hours, while the difference percentage of luminance increases with the excitation time, which indicates that the service life of the DCEL material screen of the present invention is improved to some extent compared with that of the DCEL screen of the conventional ZnSMn·Cu material. Claim 1. A direct current electroluminescent powder material and its producing method, the characteristics of the present invention is in high purity zinc sulfide (ZnS) administered powder raw materials for the substrate, mixed with a certain amount of manganese ion (Mn2 +) and Al3 +, B3 +, Y3 + and Ga3 +, either in In3 + ions, water, drying, grinding in a quartz tube after burning, burning temperature is 800 ℃ ~ 1000 ℃, calcination time 1-3 hours, then through post-processing, copper clad, screening at low temperature, constant temperature (60 ℃ -- 80 ℃), and obtained after drying process. 2. According to the powder material described in Claim 1 and its preparation method, its characteristic is that manganese ion (Mn2+) is mixed into matrix ZnS in the aqueous solution form of MnCl2, and its weight percentage in (ZnS) is 0.4% ~ 1%. 3. According to the powder material described in Claim 1 or 2 and its preparation method, it is characterized by any ion in Al3+, B3+, Y3+, Ga3+ and In3+, and its weight percentage in ZnS is 0.02% ~ 0.1%. Full text in this invention, we propose a new efficient direct current electroluminescent powder material, this material is to use pure zinc sulfide (ZnS) administered powder raw materials as the substrate, and then mixed with a certain amount of manganese ion (Mn document Numbers C09K11/64 gk1050892sq90108788 publication on April 24, 1991 of the filing date of October 27, 1990, October 27, 1990, the inventor guo copper Ann applicant: optical precision machinery research institute, Chinese Academy of Sciences, xi 'an