论文部分内容阅读
因电致发光效率高和器件制备工艺简单,聚合物为主体的绿色磷光电致发光成为一个研究热点.共轭聚合物的三线态能级一般低于绿色磷光材料的三线态能级,易对磷光的发光引起猝灭导致低的发光效率,所以较少被用作绿色磷光材料的主体.通过增加聚乙烯基咔唑(PVK)作为空穴传输层,获得了高发光效率的共轭聚合物聚芴(PFO)作主体绿色磷光发射,甚至高于相同条件下以PVK为主体的绿色磷光发射.究其原因,PVK的电子阻挡作用使发光中心靠近PVK与PFO的界面,界面处PVK因为其高的三线态能级增强了绿色磷光的发光.当三-(2-苯基吡啶)-Ir(Ir(ppy)3)掺杂浓度为2%时得到了最高的亮度效率24.8cd/A,此时的电流密度为4.65mA/cm2,功率效率为11lm/W,最高亮度达到35054cd/m2,色坐标是(0.39,0.56).
Due to the high electroluminescence efficiency and simple preparation process of the device, green phosphorescent electroluminescence, which is mainly composed of polymer, has become a research hotspot. The triplet energy level of the conjugated polymer is generally lower than the triplet energy level of the green phosphorescent material, Phosphorescent emission causes quenching resulting in low luminous efficiency, so it is less used as a host of a green phosphorescent material. By adding polyvinylcarbazole (PVK) as a hole transport layer, a highly luminous conjugated polymer Polyfluorene (PFO) as the main green phosphorescence emission, even higher than the same under the conditions of PVK as the main green phosphorescent emission.The reason, PVK electron blocking effect makes the luminescence center near PVK and PFO interface, the interface at PVK because of its The high triplet energy level enhances the luminescence of green phosphorescence.The highest brightness efficiency of 24.8 cd / A was obtained when doping concentration of Ir (ppy) 3 was 3% The current density at this time was 4.65 mA / cm2, the power efficiency was 11 lm / W, the maximum brightness reached 35054 cd / m2, and the color coordinates were (0.39, 0.56).