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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Light-Induced Structural Change in Iridium Complexes Studied by Electron Spin Resonance
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Light-Induced Structural Change in Iridium Complexes Studied by Electron Spin Resonance

机译：电子自旋共振研究铱配合物的光诱导结构变化

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摘要

Iridium-based compounds are materials of great interest in the production of highly efficient organic light emitting diodes and several other applications. However, these organometallic compounds present relative low stability due to photodegradation processes still not well understood. In this work we investigated paramagnetic states induced by UV photoexcitation on iridium(III) bis[(4,6-fluorophenyl)-pyridinato-N,C2′]picolinate (FIrpic) and iridium(III)-tris(2-phenylpyridine) (Ir(ppy)_3) complexes dispersed in different polymeric matrices by electron spin resonance (ESR). Photogenerated charged states with relatively strong hyperfine interactions were observed and attributed to matrix/complex charge-transfer processes. Measurements of the signal amplitude decay after photoexcitation interruption were performed as a function of temperature. The photoinduced centers are thermally activated with energy barrier between 0.3 and 0.6 eV. Electronic structure calculations suggest that the signals observed by ESR are associated with metastable negatively charged Ir complexes distorted structures.
机译：铱基化合物是生产高效有机发光二极管和其他几种应用的重要材料。然而，由于光降解过程，这些有机金属化合物呈现出相对较低的稳定性，仍然尚不为人所知。在这项工作中，我们研究了紫外光激发对铱[III]双[（4,6-氟苯基）-吡啶基-N，C2']吡啶甲酸（FIrpic）和铱（III）-三（2-苯基吡啶）（ Ir（ppy）_3）络合物通过电子自旋共振（ESR）分散在不同的聚合物基质中。观察到具有相对强的超精细相互作用的光生电荷状态，并归因于基质/复杂的电荷转移过程。光激发中断后信号幅度衰减的测量是温度的函数。光诱导的中心被热活化，能量垒在0.3和0.6 eV之间。电子结构计算表明，ESR观察到的信号与亚稳态带负电的Ir配合物扭曲结构有关。

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