Modulating the Optoelectronic Properties of Large, Conjugated, High-Energy Gap, Quaternary Phosphine Oxide Hosts: Impact of the Triplet-Excited-State Location
The purposeful modulation of the optoelectronicproperties was realised on the basis of a series of the large, conjugated, phosphineoxidehosts 9,9‐bis‐4′‐[2‐(diphenylphosphinoyl)phenoxy]biphenyl‐4‐yl}‐9H‐fluorene (DDPESPOF), 9,9‐bis‐3′‐(diphenylphosphinoyl)‐4′‐[2‐(diphenylphosphinoyl)phenoxy]biphenyl‐4‐yl}‐9H‐fluorene (DDPEPOF), 9‐[4′‐(9‐4′‐[2‐(diphenylphosphoryl)phenoxy]biphenyl‐4‐yl}‐9H‐flu
A series of aryl phosphine oxide hosts named DPExPOPhCzn were constructed to rationally investigate the significant correlation between T1 excited state locations and EL performance of their PHOLEDs.
Constructing Low-Triplet-Energy Hosts for Highly Efficient Blue PHOLEDs: Controlling Charge and Exciton Capture in Doping Systems
作者:Chunmiao Han、Fangchao Zhao、Zhen Zhang、Liping Zhu、Hui Xu、Jing Li、Dongge Ma、Pengfei Yan
DOI:10.1021/cm403160p
日期:2013.12.23
the aim to rationally figure out the significance of charge and exciton capture in the electrophosphorescent processes in low-triplet-energy hosts involved doping systems, the frontier molecular orbital (FMO) energy levels of a series low-triplet-energy hosts with diphenylphosphine oxide (DPPO) and triphenylamine (TPA), collectively named DPExPOTPAn, were successfully and gradually tuned on the basis
为了合理地计算涉及掺杂系统的低三重态能量主体中电致磷光过程中电荷和激子俘获的重要性,一系列具有二苯基膦氧化物的低三重态能量主体中的前沿分子轨道(FMO)能级(DPPO)和三苯胺(TPA)(统称为DPE x POTPA n)已根据其恒定的三重态能级(T 1)的2.63 eV)消除了来自主机-掺杂物能量传输的干扰。结果表明,器件效率与掺杂剂上形成的载流子陷阱的深度成正比,而与基质的激子捕获能力成反比,这由基于FIrpic的PHOLED的最高15%的外部量子效率证明了这一点。DPESPOTPA最深的空穴和电子陷阱和中间具有最弱的激子捕获能力DPE X POTPA ñ。这项工作不仅证明了这种主体材料在低驱动电压应用中的巨大优势和潜力,而且阐明了用于蓝色PHOLED的高效低三重态能量主体的决定因素,这些决定因素对于有目的的分子设计是有意义的。
Spatially optimized quaternary phosphine oxide host materials for high-efficiency blue phosphorescence and thermally activated delayed fluorescence organic light-emitting diodes
high-energy-gap hosts in blue phosphorescence and thermallyactivateddelayedfluorescence light-emitting diodes (PHOLEDs and TADF OLEDs), in comparison to a ternary analogue 9-(4-(9-(4-(diphenylphosphoryl)phenyl)-9H-fluoren-9-yl)phenyl)-9H-carbazole (9CzFSPO). The donor–acceptor (D–A) distance in 9CzFDPESPO is elongated through the involvement of diphenylene as a π-extender, while the second phosphine oxide