一、引言 1954年Zalm首次发现了直流电致发光(DCEL)现象,但是在1966年前DCEL材料并未引起人们的注意,研究工作也很少。当时,DCEL材料亮度低,激发电压高,发光只限于个别颗粒,半寿命极短以致难于进行定量的测量。直到1966年英国的A.Vecht等制出了较好的ZnS:Mn,Cu粉末DCEL材料并首次报导了DCEL材料的定量 I. Introduction Zalm first discovered the phenomenon of direct current electroluminescence (DCEL) in 1954, but DCEL materials did not attract much attention and research work was rare until 1966. At the time, DCEL materials were low brightness, high excitation voltage, light emission was limited to individual particles, and the half life was so short that it was difficult to make quantitative measurements. Until 1966, A.Vecht et al made a good DCS material of ZnS: Mn, Cu powder and reported the quantitative of DCEL material for the first time