Hui Xu, Kun Yin, Wei Huang
Jan 28, 2010
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Influential Citations
52
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Journal
Journal of Physical Chemistry C
Abstract
Three functional bidentate aryl phosphine oxide (APO) derivatives characterized by two diphenylphosphine oxide moieties [2-(diphenylphosphoryl)-N-(2-(diphenylphosphoryl)-4-methoxyphenyl)-4-methoxy-N-(4-methoxyphenyl)aniline (TMOADPO), 3,6-bis(diphenylphosphoryl)-9-ethyl-9H-carbazole (EtCzDPO), and 3,6-bis(diphenylphosphoryl)-9-phenyl-9H-carbazole (PhCzDPO)] bridged with a hole-transporting arylamine, as well as their tertiary complexes [Eu(TTA)3(TMOADPO)2 1, Eu(TTA)3(EtCzDPO)2 2, and Eu(TTA)3(PhCzDPO)2 3 (TTA = 2-thenoyltrifluoroacetonate)], were designed and synthesized. The strong absorption antennae effect of the functional APO ligands was proved. It is shown that their more rigid structure and chelate coordinate mode impart a decreased degree of freedom and form much more compact complex structures, which not only reduces the energy loss caused by the structure relaxation but also restrains the solvent quenching and facilitates the energy transfer from the APO ligands to Eu3+. Thermal analysis was als...