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。
Rationally Investigating the Influence of T<sub>1</sub>Location on Electroluminescence Performance of Aryl Amine Modified Phosphine Oxide Materials
作者:Chunmiao Han、Liping Zhu、Jing Li、Fangchao Zhao、Hui Xu、Dongge Ma、Pengfei Yan
DOI:10.1002/chem.201404615
日期:2014.12.1
and host‐localized triplet–triplet annihilation and triplet–polaron quenching effects was performed on the basis of a series of naphthyldiphenylamine (DPNA)‐modifiedphosphineoxide hosts. The number and ratio of DPNA and diphenylphosphine oxide was adjusted to afford symmetrical and unsymmetrical molecular structures and different electronic environments. As designed, the first triplet (T1) states
Convergent Modulation of Singlet and Triplet Excited States of Phosphine-Oxide Hosts through the Management of Molecular Structure and Functional-Group Linkages for Low-Voltage-Driven Electrophosphorescence
作者:Chunmiao Han、Zhensong Zhang、Hui Xu、Guohua Xie、Jing Li、Yi Zhao、Zhaopeng Deng、Shiyong Liu、Pengfei Yan
DOI:10.1002/chem.201203349
日期:2013.1.2
controllable tuning of the excitedstates in a series of phosphine‐oxide hosts (DPExPOCzn) was realized through introducing carbazolyl and diphenylphosphine‐oxide (DPPO) moieties to adjust the frontier molecular orbitals, molecular rigidity, and the location of the tripletexcitedstates by suppressing the intramolecular interplay of the combined multi‐insulating and meso linkage. On increasing the number
通过引入咔唑基和二苯基膦氧化物(DPPO)部分来调节前沿分子轨道,分子刚度和三重激发态的位置,可以实现一系列膦氧化物主体(DPExPOCz n)中激发态的可控调节。通过抑制多重绝缘和内消旋结合的分子内相互作用 。随着取代基数量的增加,同时降低第一单重态能级(S 1)和提高第一三重态能级(T 1),达到约3.0 eV)。前者的变化主要是由于咔唑基对HOMO的贡献和扩展的共轭作用。后者的变化是由于分子刚性的增强和T 1态从二苯醚基向咔唑基部分的转变。这种激发态的会聚调制不仅有助于将放热能转移到磷光有机发光二极管(PHOLED)中的掺杂剂上,而且还可以实现电学性能的微调,以实现发光中平衡的载流子注入和输运层。结果,证明了发蓝光的PHOLED的良好性能,包括更低的驱动电压:开始时为2.6 V,在100 cd m -2时为3.0V。,并且EQE显着提高了12.6%。