Polymer light-emitting diodes based on cationic iridium(III) complexes with a 1,10-phenanthroline derivative containing a bipolar carbazole–oxadiazole unit as the auxiliary ligand

Polymer light-emitting diodes based on cationic iridium(III) complexes with a 1,10-phenanthroline derivative containing a bipolar carbazole–oxadiazole unit as the auxiliary ligand
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基于阳离子铱(III)络合物与含有双极性咔唑-恶二唑单元作为辅助配体的1,10-菲咯啉衍生物的聚合物发光二极管

DOI:
10.1016/j.optmat.2014.08.013
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发表时间:
2014-11
期刊:
影响因子:
3.9
通讯作者:
Yong Cao
Yong Cao
中科院分区:
材料科学3区
文献类型:
--
作者:
Furui Yang;Hongbin Wu;Wei Yang;Yong Cao

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合成了一种含咔唑-恶二唑双极性单元的1,10-邻菲咯啉衍生物(co-phen),并将其用作阳离子铱配合物[(ppy)2 Ir(co-phen)] PF 6(ppy:2-苯基吡啶)和[(npy)2 Ir(co-phen)] PF 6(npy:2-(萘-1-基)吡啶)的辅助配体。两种配合物具有较高的热稳定性,玻璃化转变温度(Tg)为207 °C和241 °C,相同的5%重量减少温度(ΔT5%)为402 °C。在溶液处理的聚合物发光二极管(PLED):ITO/PEDOT:PSS/PVK:PBD:complex(质量比100:40:x,x= 1.0、2.0和4.0)/CsF/Al中,使用[(ppy)2 Ir(co-phen)] PF 6和[(npy)2 Ir(co-phen)] PF 6的PLED的最大亮度分别为12567 cd m-2和11032 cd m-2,最大亮度效率分别为17.3 cd A-1和20.4 cd A-1,最大功率效率分别为9.8 lm W-1和10.3 lm W-1,最大外量子效率分别为9.3%和11.4%。CIE色坐标分别在(0.37,0.57)和(0.44,0.54)附近,对应于黄色绿色区域。
A 1,10-phenanthroline derivative (co-phen) containing a bipolar carbazole–oxadiazole unit was synthesized and used as the auxiliary ligand in cationic iridium(III) complexes[(ppy)2Ir(co-phen)]PF6(ppy: 2-phenylpyridine) and[(npy)2Ir(co-phen)]PF6(npy: 2-(naphthalen-1-yl)pyridine). Two complexes have high thermal stability with the glass-transition temperatures (Tg) of 207 °C and 241 °C, and the same 5% weight-reduction temperatures (ΔT5%) of 402 °C. Both of them were used as phosphorescent dopants in solution-processed polymer light-emitting diodes (PLEDs): ITO/PEDOT: PSS/PVK: PBD: complex (mass ratios 100: 40:x,x= 1.0, 2.0, and 4.0)/CsF/Al. The maximum luminances of the PLEDs using[(ppy)2Ir(co-phen)]PF6and[(npy)2Ir(co-phen)]PF6were 12567 cd m−2and 11032 cd m−2, the maximum luminance efficiencies were 17.3 cd A−1and 20.4 cd A−1, the maximum power efficiencies were 9.8 lm W−1and 10.3 lm W−1, and the maximum external quantum efficiencies were 9.3% and 11.4% respectively. The CIE color coordinates were around (0.37, 0.57) and (0.44, 0.54) respectively, corresponding to the yellow green region.
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