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首页> 外文期刊>Advanced Functional Materials >Enhancement of external quantum efficiency of red phosphorescent organic light-emitting devices ices with facially encumbered and bulky Pt-II porphyrin complexes
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Enhancement of external quantum efficiency of red phosphorescent organic light-emitting devices ices with facially encumbered and bulky Pt-II porphyrin complexes

机译：Pt-II卟啉配合物表面受阻而增强了红色磷光有机发光器件的外部量子效率

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摘要

An enhancement in the external quantum efficiency (QE) of red phosphorescent organic light-emitting devices (OLEDs) by using facially encumbered and bulky meso-aryl substituted Pt-II porphyrin complexes is demonstrated. The maximum external QEs of phosphorescent OLEDs doped with the facially non-encumbered Pt-II porphyrin complex 1 [5,15-bis[4-(4,4-dimethyl-2,6-dioxacyclohexyl)phenyl]-2,8, 12,18-tetrahexyl-3,7,13,17-tetramethylporphyrin platinum(II)], the facially encumbered Pt-II porphyrin complex 2 [5,15-bis(2,6-dimethoxyphenyl)-2,8,12,18-tetrahexyl-3,7,13,17-tetramethylporphyrinato platinum(II)], the Pt-II porphyrin complex 3 that bears bulkier 3,5-di-tert-butylphenyl substituents [5,15-bis(3,5-di-t-butylphenyl)-2,8,12,18-tetrahexyl-3,7,13,17-tetramethylporphyrin platinum(II)], and the "doubly-decamethylene-strapped" Pt-II porphyrin complex 4 were 1, 4.2, 7.3, and 8.2%, respectively. The trend of increasing QE values in the order of 1 < 2 < 3 < 4 may be related to facial encumbrance and steric bulkiness of meso-aryl Substituted Pt-II porphyrin complexes. Especially, in the case of the Pt-II porphyrin 4, it is considered that the "double straps" play an important role in restricting rotational freedom of the meso-aryl substituents. The triplet excited-state lifetimes for Pt-II porphyrins 1 4 in OLEDs at an injection current density of 0.55 mA cm(-2) were 80, 103, 140, and 152 mu s, respectively. We believe that the trend of increasing triplet lifetime in going from I to 4 is correlated with suppressing non-radiative decay.
机译：通过使用面部受阻的大体积介孔芳基取代的Pt-II卟啉配合物，可以提高红色磷光有机发光器件（OLED）的外部量子效率（QE）。掺入面部无阻碍的Pt-II卟啉配合物1 [5,15-双[4-（4,4-二甲基-2,6-二氧杂环己基）苯基] -2,8，12的磷光OLED的最大外部QE ，18-四己基-3,7,13,17-四甲基卟啉铂（II）]，表面受阻的Pt-II卟啉复合物2 [5,15-双（2,6-二甲氧基苯基）-2,8,12,18 -四己基-3,7,13,17-四甲基卟啉铂（II），Pt-II卟啉配合物3带有较大的3,5-二叔丁基苯基取代基[5,15-bis（3,5-di -叔丁基苯基）-2,8,12,18-四己基-3,7,13,17-四甲基卟啉铂（II）]和“双-十甲基链状” Pt-II卟啉配合物4为1，4.2 ，分别为7.3％和8.2％。 QE值按1 <2 <3 <4的顺序增加的趋势可能与中芳基取代的Pt-II卟啉配合物的面部负担和空间膨胀有关。特别是在Pt-II卟啉4的情况下，认为“双带”在限制内芳基取代基的旋转自由度中起重要作用。在注入电流密度为0.55 mA cm（-2）的情况下，OLED中Pt-II卟啉1 4的三重激发态寿命分别为80、103、140和152μs。我们认为，三重态寿命从I延长到4的趋势与抑制非辐射衰变有关。

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