ZnS:Cu,Eu,Br粉末ACEL的老化

退火的处理方法对ZnS:Cu,Eu,Br粉末ACEL材料的老化性能有明显的改善,但处理时颗粒表面必须包有过剩的铜,否则将破坏发光性能。若用氰化钾洗去表面过剩的铜后,再进行包铜退火处理,发光亮度部分恢复,老化性能改善。我们认为处理后老化性能改善的原因,不是改善了发光中心的条件,可能是改善了Cu2S相的条件,因而抑制了离子的迁移。

MAINTENANCE OF ZnS-Cu,Eu,Br ELECTROLUMINESCENT PHOSPHOR UNDER AC FIELD EXCITATION

The performance of maintenance is, considerably improved as a result of annealing ZnS-Cu,Eu,Br ACEL powder at a higher temperature in a shorter time. When treated the particles of phosphor must be coated with excessive copper sulphide. Otherwise, the luminescence performance would be spoilt. If excessive copper sulphide has been washed by a dilute solution of potassium cyanide (or sodium cyanide), the particles must be coated again with copper sulphide and baked, thus brightness of electroluminescence can be partially restored and the deteriorated performance improved. The reason for the improvement of the phosphor maintenance is attributed to the improvement of the condition of Cu2S phase, but not that the of luminescent center.