Synthesis and characterization of blue-to-green electrophosphorescence emitter based on pyrazole iridium complexes

Synthesis and characterization of blue-to-green electrophosphorescence emitter based on pyrazole iridium complexes
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基于吡唑铱配合物的蓝绿电致磷光发射体的合成与表征

DOI:
10.1016/j.dyepig.2013.04.022
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发表时间:
2013-10
期刊:
影响因子:
4.5
通讯作者:
Xu Bingshe
Xu Bingshe
中科院分区:
材料科学2区
文献类型:
--
作者:
Xu Huixia;Yue Yan;Qu Litao;Hao Yuying;Wang Hua;Chen Liuqing;Xu Bingshe

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为了克服电磷光有机发光器件的滚转效率,合成了(ppz)2Ir(N * N)的Ir(III)配合物,并命名为(ppz)2Ir(tfmpptz)、(ppz)2Ir(fpptz)、(ppz)2Ir(tfmptz)和(ppz)2Ir(pybi) (ppz: 1-苯基吡唑啉;N * N: N, N′-杂芳香)。报道了它们的分子结构、光物理性质和循环伏安数据。(ppz)2Ir(tfmpptz)、(ppz)2Ir(fpptz)晶体为单斜晶,空间群为P2(1)/n, (ppz)2Ir(tfmptz)晶体为三斜晶,空间群为P-1。(ppz)2Ir(tfmpptz)、(ppz)2Ir(fpptz)、(ppz)2Ir(tfmptz)和(ppz)2Ir(pybi)在室温下的最大发射峰分别出现在486,497,473和530 nm处。采用热蒸发法制备了ITO/NPB (30 nm)/CBP: (ppz)2Ir(N - N) (6%, 30 nm)/BAlq(10 nm)/Alq3(30 nm)/LiF(1 nm)/Al (100 nm)结构的器件。结果表明,辅助配体的较大位阻有效地抑制了高电流密度下效率的滚降。
To overcome the roll-off efficiency of electrophosphorescent organic light-emitting devices, Ir(III) complexes of (ppz)2Ir(NˆN) were synthesized and named for (ppz)2Ir(tfmpptz), (ppz)2Ir(fpptz), (ppz)2Ir(tfmptz) and (ppz)2Ir(pybi) (ppz: 1-phenylpyrazolato; NˆN: N, N′-heteroaromatic). Their molecular structures, photophysical properties and cyclic voltammetric data were reported. The crystals of (ppz)2Ir(tfmpptz), (ppz)2Ir(fpptz) are monoclinic, space group P2(1)/n, and (ppz)2Ir(tfmptz) is triclinic, space group P-1. The emission maximum peaks of (ppz)2Ir(tfmpptz), (ppz)2Ir(fpptz), (ppz)2Ir(tfmptz) and (ppz)2Ir(pybi) at room temperature appear at 486, 497, 473 and 530 nm, respectively. The devices with architecture of ITO/NPB (30 nm)/CBP: (ppz)2Ir(NˆN) (6%, 30 nm)/BAlq(10 nm)/Alq3(30 nm)/LiF(1 nm)/Al (100 nm) were fabricated by thermal evaporation. The results indicate that the larger steric hindrance of ancillary ligands efficiently suppressed the roll-off of efficiency at high current density.
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