为了比较单线态激子与三线态激子形成截面的大小,作者将荧光染料4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethybulolidyl-9-enyl)-4H-pyran(DCJTB)和磷光材料factris-(2-phenylpyridine)试dium[Ir(ppy)3]共掺杂在N—vinylcarbazole(PVK)中作为发光层,制作了多层有机电致发光器件。通过对其光致发光及电致发光特性的研究,计算出Ir(ppy)3激子的形成截面比DCJTB激子的形成截面大得多。
In the present paper, polymer-based light-emitting diode employing N-vinylcarbazole (PVK) doped with dilute phosphorescent dye factris-(2-phenylpyridine) iridium [Ir( PPy)3 ] and fluorescent dye 4-(dicyanomethylene)-2-t-butyl-6-( 1,1,7,7- tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) as active layer was fabricated in order to compare the formation cross-sections of triplet exciton and singlet exciton. According to the changes in the electroluminescence (EL) spectrum and the relative intensity of photoluminescence (PL) spectrum, we deduce that the exciton formation cross-section of Ir(ppy)3 is larger than that of DCJTB.