摘要
研究了ZnS:ErF_3和ZnS:HoF_3两种材料制备的交流驱动的绿色电致发光薄膜(ACELTF)的发光亮度和色度与ErF_3和HOF_3掺杂浓度的关系。对于ZnS:ErF_3和ZnS:HoF_3,其最佳掺杂浓度分别为7×10^(-3)和2×10^(-3)mol/mol基质;获得的最高发光亮度分别为900cd/m^2和550cd/m^2。当ErF_3的掺杂浓度由3×10^(-4)mol/mol基质增至3×10^(-1)mol/mol基质时,ZnS:ErF_3薄膜的色座标(x,y值)由0.251,0.664变为0.392,0.586;当HOF_3的掺杂浓度由3×10^(-4)mol/mol基质增至1×10^(-1)mol/mol基质时,ZnS:HoF_3薄膜的色座标值由0.315,0.615变为0.472,0.521。
In this paper we have studied the dependence of brightness and color coordinates of ACELTF (Alternative current electroluminescence thin film) in ZnS doped with ErF_3 and HoF_3 on the activator concentrations. The result indicates that the optimum concentrations of dopant is about 7×10^(-3)mol/mol[ZnS] and 2×10^(-3)mol/mol [ZnS] for ZnS:ErF_3 and ZnS:HoF_3 ACELTF respectively. The highest brightness of 900cd/m^2, 550cd/m^2 and 2300cd/m^2 have been obtained for ZnS:ErF_3, ZnS:HoF_3 ard ZrS:TbF_3 ACELTF respectively. For ZnS:ErF_3 and ZnS:HoF_3 ACELTF devices, the EL color coordinates shift with activator concentrations. At lower concentration (ErF_3～3×10^(-4)mol/mol[ZnS], HoF_3～3×10^(-4)mol/mo[ZnS], the color coordinates of ZnS:ErF_3 and ZnS:HoF_3 ACELTF devices are x=0.251, y=0.664 and x=0.315, y=0.615, at higher concentrations (ErF_3～3×10^(-1)mol/mol[ZnS], HoF_3～1×10^(-1)mol/mol[ZnS]), the color coordinates of ZnS:ErF_3 and ZnS:HoF_3 ACELTF devices are x=0.392, y=0.586 and x=0.472, y=0.521 respectively. For ZnS:TbF_3 ACELTF device, the color coordinate is independent of the TbF_3 concentration.These results are due to concentration quenching of luminescence through the cross-relaxation processes.
出处
《中国稀土学报》
CAS
CSCD
北大核心
1989年第1期23-27,共5页
Journal of the Chinese Society of Rare Earths
