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首页> 外文期刊>Chemistry: A European journal >High-Performance Blue OLEDs Based on Phenanthroimidazole Emitters via Substitutions at the C6-and C9-Positions for Improving Exciton Utilization
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High-Performance Blue OLEDs Based on Phenanthroimidazole Emitters via Substitutions at the C6-and C9-Positions for Improving Exciton Utilization

机译：基于苯并咪唑发射体的高性能蓝色OLED，可通过取代C6和C9位置来改善激子的利用

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摘要

Donor-acceptor (D-A) molecular architecture has been shown to be an effective strategy for obtaining high-performance electroluminescent materials. In this work, two D-A molecules, Ph-BPA-BPI and Py-BPA-BPI, have been synthesized by attaching highly fluorescent phenanthrene or pyrene groups to the C6- and C9-positions of a locally excited-state emitting phenylamine-phenanthroimidazole moiety. Equipped with good physical and hybridized local and charge-transfer properties, both molecules show high performances as blue emitters in nondoped organic light-emitting devices (OLEDs). An OLED using Ph-BPA-BPI as the emitting layer exhibits deep-blue emission with CIE coordinates of (0.15, 0.08), and a maximum external quantum efficiency (EQE), current efficiency (CE), and power efficiency (PE) of 4.56 %, 3.60 cdA(-1), and 3.66 lmW(-1), respectively. On the other hand, a Py-BPA-BPI-based, sky-blue OLED delivers the best results among nondoped OLEDs with CIEy values of <0.3 reported so far, for which a very low turn-on voltage of 2.15 V, CIE coordinates of (0.17, 0.29), and maximum CE, PE, and EQE values of 10.9 cdA(-1), 10.5 lmW(-1), and 5.64 %, were achieved, respectively. More importantly, both devices show little or even no efficiency roll-off and high singlet exciton-utilizing efficiencies of 36.2% for Ph-BPA-BPI and 39.2% for Py-BPA-BPI.
机译：供体-受体（D-A）分子结构已被证明是获得高性能电致发光材料的有效策略。在这项工作中，通过将高荧光菲或pyr基团连接到局部激发态发射苯胺-菲并咪唑部分的C6-和C9位上，合成了两个DA分子Ph-BPA-BPI和Py-BPA-BPI。 。两种分子都具有良好的物理和杂化的局部和电荷转移特性，在非掺杂有机发光器件（OLED）中作为蓝光发射器具有很高的性能。使用Ph-BPA-BPI作为发射层的OLED表现出深蓝色发射，其CIE坐标为（0.15，0.08），最大外部量子效率（EQE），电流效率（CE）和功率效率（PE）为分别为4.56％，3.60 cdA（-1）和3.66 lmW（-1）。另一方面，基于Py-BPA-BPI的天蓝色OLED在迄今为止未报道的CIEy值小于0.3的非掺杂OLED中提供了最佳结果，其CIE坐标为2.15 V的极低开启电压（0.17，0.29）的最大电导率，最大CE，PE和EQE值分别达到10.9 cdA（-1），10.5 lmW（-1）和5.64％。更重要的是，两种设备都显示出很少甚至没有效率下降，而Ph-BPA-BPI的单重态激子利用率为36.2％，Py-BPA-BPI的为39.2％。

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