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Comprehensive Investigation into Luminescent Properties of Ir(III) Complexes: An Integrated Computational Study of Radiative and Nonradiative Decay Processes
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2018-05-24 00:00:00 , DOI: 10.1021/acs.inorgchem.8b00705
Yu Wang 1 , Peng Bao 2 , Jian Wang 1 , Ran Jia 1 , Fu-Quan Bai 1 , Hong-Xing Zhang 1
Affiliation  

A comprehensive and concrete exploration into the deactivation mechanisms of luminescent materials is imperative, with the improvement of simulating and computing technology. In this study, an integrated calculation scheme is employed on five Ir(III) complexes for thorough investigation of their photophysical properties, including radiative (kr) and nonradiative (knr) decay rates. As a most famous Ir(III) complex with superior quantum efficiency, fac-Ir(ppy)3 herein serves as a reference relative to the other four β-diketonate complexes. Both temperature-independent and temperature-dependent knr are taken into account quantitatively for the first time, to unearth the role of different ancillary ligands in the determination of luminescent properties. Since the validated calculations of kr for the five complexes are of the same order of magnitude, the nonemissive peculiarity of 4 is caused by large knr. The newly designed compound 5, which simply has two more −CH2 groups than 4 in the ancillary ligand, further manifests that the reason for large knr in molecule 4 should be attributed to the ligand resonance caused by great π conjugation.

中文翻译:

Ir(III)配合物的发光性质的综合研究:辐射和非辐射衰变过程的综合计算研究。

随着模拟和计算技术的进步,有必要对发光材料的失活机理进行全面而具体的探索。在这项研究中,对五个Ir(III)配合物采用综合计算方案,以全面研究其光物理性质,包括辐射(k r)和非辐射(k nr)衰减速率。作为具有优异量子效率的最著名的Ir(III)配合物,fac -Ir(ppy)3在本文中是相对于其他四种β-二酮酸酯配合物的参考。与温度无关和与温度有关的k nr首次进行定量分析,以揭示不同辅助配体在确定发光特性中的作用。由于对五个络合物的k r的经过验证的计算具有相同的数量级,因此4的非遗漏特征是由较大的k nr引起的。新设计的化合物5在辅助配体中仅比4具有两个多的-CH 2基团,进一步表明分子4中k nr大的原因应归因于很大的π共轭引起的配体共振。
更新日期:2018-05-24
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