白光有机电致发光器件的载流子传输与复合特性（英文）

基于一种将具有电荷传输性的双极性主体材料与蓝、黄光客体材料共蒸的单层结构的同质结结构,制备了色温可调的白光有机电致发光器件(OLED)。由于不存在激子阻挡层,单层结构容易发生漏电流现象,致使OLED器件具有较高的工作电压和较低的电流/功率效率。在空穴/电子传输层进行p/n型掺杂的同质结结构则大大改善了器件性能。研究表明:该种器件结构获得了相对较低的起压5.6V,较高的电流效率2.64cd/A和低效率滚降,其色坐标则随着亮度的增加沿着普朗克轨迹变化,产生类似于太阳光的发光特性。另外,对主体材料和共蒸层的电荷载流子的传输特性和复合机制也进行了一系列分析研究。     

Hole transporting material 5, 10, 15-tribenzyl-5H-diindolo[3, 2-a:3',2'-c]-carbazole for efficient optoelectronic applications as an active layer

In order to explore the novel application of the transparent hole-transporting material 5,10,15-tribenzyl-5Hdiindolo[3,2-a:3',2'-c]-carbazole(TBDI),in this article TBDI is used as an active layer but not a buffer layer in a photodetector(PD),organic light-emitting diode(OLED),and organic photovoltaic cell(OPV) for the first time.Firstly,the absorption and emission spectra of a blend layer comprised of TBDI and electron-transporting material bis-(2-methyl-8-quinolinate) 4-phenylphenolate(BAlq) are investigated.Based on the absorption properties,an organic PD with a peak absorption at 320 nm is fabricated,and a relatively-high detectivity of 2.44×10~(11) cm· Hz~(1/2)/W under 320-nm illumination is obtained.The TBDI/tris(8-hydroxyquinoline) aluminum(Alq_3) OLED device exhibits a comparable external quantum efficiency and current efficiency to a traditional 4,4-bis[N-(l-naphthyl)-N-phenyl-amino]biphenyl(α-NPD)/Alq_3 OLED.A C_(70)-based Schottky junction with 5 wt%-TBDI yields a power conversion efficiency of 5.0%,which is much higher than 1.7%for an α-NPD-based junction in the same configuration.These results suggest that TBDI has some promising properties which are in favor of the hole-transporting in Schottky junctions with a low-concentration donor.     

白光有机电致发光器件的载流子传输与复合特性

基于一种将具有电荷传输性的双极性主体材料与蓝、黄光客体材料共蒸的单层结构的同质结结构,制备了色温可调的白光有机电致发光器件(OLED)。由于不存在激子阻挡层,单层结构容易发生漏电流现象,致使OLED器件具有较高的工作电压和较低的电流/功率效率。在空穴/电子传输层进行p/n型掺杂的同质结结构则大大改善了器件性能。研究表明: 该种器件结构获得了相对较低的起压5.6 V,较高的电流效率2.64 cd/A和低效率滚降,其色坐标则随着亮度的增加沿着普朗克轨迹变化,产生类似于太阳光的发光特性。另外,对主体材料和共蒸层的电荷载流子的传输特性和复合机制也进行了一系列分析研究。