ZnxCd1-xSySe1-y:Cu,Br黄色交流电致发光材料的制备及发光特性

本文首次报导用ZnxCd1-xSySe1-y四元基质制备黄色ACEL粉末材料.提出了用四元系镧备黄色ACEL材料的设计思想,通过实验,确定了合适的组分x,y值,采用较简便工艺,获得了亮度较高,色度符合使用要求的黄色ACEL粉。测量了此材料在不同使用条件下的发光特性,为应用目标提供了参数。

PREPARATION OF ZnxCd1-xSySe1-y:Cu,Br YELLOW ACEL POWDER AND ITS ELECTROLUMINESCENT PROPERTIES

The results of preparing ZnxCd1-xSySe1-y;Gu,Br yellow ACEL powder have been reported. In zinc sulphide, the bottom of conduction band lowers down if Cd2+ are substituted for Zn2+, the top of valence band arises if Se2- are substituted for S2-. Such substitutions can change the band gap Eg of ZnS. (1) Se2- are substituted for S2- partly in ZnS, i.e. Zn (S,Se). Yellow ACEL Zn(S,Se):Cu, Br can be obtained when the proportion of Se is more than 50%. But in this case, the ACEL luminance decreases significantly. It is difficult to make practical display devices from them. (2) Cd2+ are substituted for Zn2+ partly in ZnS, i.e.(Zn,Cd)S. If one wants to shift ACEL spectrum of ZnS:Cu to the red by a certain amount, the fraction of Cd necessary to be added to ZnS is less than that of Se. But X-ray analysis of ZnxCd1-xSySe1-y:Cu, Br shows that aaaaaaaaaaa phase appears in the mixed crystals when x<0.94. Therefore, its ACEL luminance also decreases. It is reasonable to assume that if both Cd2+ and Se2-are added in small amount, the EL spectrum can be shifted to the yellow region without remarkably decreasing the EL intensity.