Bright and efficient, non-doped, phosphorescent organic red-light-emitting diodes
Bright and efficient, non-doped, phosphorescent organic red-light-emitting diodes
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DOI：
10.1002/adfm.200400137
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发表时间：
2004-12-01
影响因子：
19
通讯作者：
Lee, GH
中科院分区：
文献类型：
--
作者：
Song, YH;Yeh, SJ;Lee, GH
具有式[（nazo）（2）Ir（Fppz）]（1）、[（nazo）（2）Ir（Bppz）]（2）和[（nazo）（2）Ir（Fptz）]（3）的Ir-（III）金属络合物[（nazo）H = 4-苯基喹唑啉，（Fppz）H = 3-三氟甲基-5-（三氟甲基）苯基）喹唑啉，（2-吡啶基）吡唑，（Bppz）H = 3-叔丁基-5-甲基-IH-吡唑（2-吡啶基）吡唑，和（Fptz）H = 3-三氟甲基-5-（三氟甲基）吡唑;[（2-吡啶基）三氮唑]的合成，并通过单晶X射线衍射分析确定了其中1的确切构型。这些配合物表现出明亮的红色磷光，在溶液和室温下的固体状态下的相对较短的寿命为0.4-1.05 μ s。在不存在基质的情况下，使用配合物1和2制备非掺杂有机发光二极管（OLED）。在λ（max）= 626 nm（主体-发射体复合物1）和652 nm（主体-发射体复合物2）处观察到饱和红色电致发光，其分别对应于1931年国际照明委员会（CIE）色度图上的坐标（0.66，0.34）和（0.69，0.31）。采用配合物1的非掺杂器件显示出高达5780 cd·m（-2）的电致发光，在8 V下的外量子效率为5.5%，电流密度为20 mA·cm（-2）。1在固态下的短磷光寿命，加上其适度的π-π堆积相互作用，似乎是其作为非掺杂的主体-发射体的不寻常的成功的决定因素。
Ir-(III) metal complexes with formula [(nazo)(2)Ir(Fppz)] (1), [(nazo)(2)Ir(Bppz)] (2), and [(nazo)(2)Ir(Fptz)] (3) [(nazo)H = 4-phenyl quinazoline, (Fppz)H = 3-trifluoromethyl-5-(2-pyridyl) pyrazole, (Bppz)H = 3-t-butyl-5-(2-pyridyl) pyrazole, and (Fptz)H = 3-trifluoromethyl-5-(2-pyridyl) triazole] were synthesized, among which the exact configuration of 1 was confirmed using single-crystal X-ray diffraction analysis. These complexes exhibited bright red phosphorescence with relatively short lifetimes of 0.4-1.05 mus in both solution and the solid-state at room temperature. Non-doped organic light-emitting diodes (OLEDs) were fabricated using complexes 1 and 2 in the absence of a host matrix. Saturated red electroluminescence was observed at lambda(max) = 626 nm (host-emitter complex 1) and 652 nm (host-emitter complex 2), which corresponds to coordinates (0.66,0.34) and (0.69,0.31), respectively, on the 1931 Commission Internationale de L'Eclairage (CIE) chromaticity diagram. The non-doped devices employing complex 1 showed electroluminance as high as 5780 cd m(-2), an external quantum efficiency of 5.5% at 8 V, and a current density of 20 mA cm(-2). The short phosphorescence lifetime of 1 in the solid state, coupled with its modest pi-pi stacking interactions, appear to be the determining factors for its unusual success as a non-doped host-emitter.