【摘要】 制备了以铱配合物(btp)2Ir(acac)磷光体为掺杂剂,分别以TPB i、CBP和A lq为发光层基质的红色电致磷光器件,比较了三种器件的性能。结果表明,在三种器件中,以A lq为基质的器件效率极低;以CBP为基质的器件,高的效率和好的色度相互矛盾;以TPB i为基质的器件性能最好,在驱动电流为4 mA/cm2时,色坐标为(x=0.62,y=0.35),亮度效率达2.43 cd/A。分析表明,(btp)2Ir(acac)分子在TPB i基质中的高效发光源于其对空穴的有效俘获。进一步的研究确定,(btp)2Ir(acac)分子在TPB i基质中的激子扩散长度为20 nm左右。更多还原

【Abstract】 The devices with a red phosphorescent dye（btp）₂Ir（acac） as a dopant in three kinds of hosts were constructed.Three kinds of host are TPBi,CBP and Alq,respectively.The device structure is ITO/CuPc/NPB/host:（btp）₂Ir（acac）/ TPBi/Alq/LiF/Al.In these devices,the cell based on Alq has a poor efficiency,and the efficiency and color purity are contradictive in CBP-based device,while the cell based on TPBi has a better performance.At the CIE coordinates（x=0.62,y=0.35）,efficiency of 2.43cd /A has been achieved at 4mA/cm².It was suggested that high-efficiency phosphorescence in TPBi-based device came from efficient trapping of holes of（btp）₂Ir（acac）.It was also demonstrated that the exciton diffuse length of（btp）₂Ir（acac） in TPBi host was about 20nm.更多还原