具有四个逐步 HOMO 能级的单共轭聚合物，用于跨大势垒 1.4 eV 到核壳量子点层的有效空穴注入，用于倒置 QLED 中的电致发光,Advanced Optical Materials

当前位置： X-MOL 学术 › Adv. Opt. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

具有四个逐步 HOMO 能级的单共轭聚合物，用于跨大势垒 1.4 eV 到核壳量子点层的有效空穴注入，用于倒置 QLED 中的电致发光
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2022-04-05 , DOI: 10.1002/adom.202102508
Shuo-En Wu, Sunil Sharma, Hsin-Lung Chen, Show-An Chen, Pavel V. Komarov, Viktor A. Ivanov, Alexei R. Khokhlov

首次提出了一种以螺聚芴（sPF）为主链，具有三苯胺（TPA）、咔唑（Cz）三个空穴传输结构的新型梯度HOMO级空穴传输聚合物（g-HTP），和N , N '-二咔唑基-3,5-苯 (mCP) 作为侧链，用于有效地将空穴注入穿过大势垒 1.4 eV 进入倒置 QD 中的绿色发射核壳量子点 (QD) CdSe/ZnS 发射层发光二极管（i-QLED）：ITO/ZnO/QD/HTP/MoO ₃/Al，其中 QD 中的两个亲油配体（OA 和 TOP）通过在 270 °C 下退火从 QD 表面部分去除，以防止溶剂在随后的空穴传输材料 (HTM) 溶液顶部涂层中溶解并改善电子和空穴迁移率，尤其是前者。研究了所提出的 g-HTP，其中 mCP 与 TPA/Cz 部分的各种m : n摩尔比以及各种报道的 HTM（PVK、Poly-TPD 和 TFB）。其中，提出的共聚单体摩尔比为 1:1 的 g-HTP 具有最佳性能 η _max 36.1 cd A ^-1和B _max 208 600 cd m ^-2，这是已报道的具有单空穴传输层的 i-QLED 中的最高性能。此外，其效率滚降从 10 000 cd m -2 时的 35.8 cd A -1 低到 100 000 cd m ^-2^时的^31.1 cd A ^-1。

"点击查看英文标题和摘要"

Single Conjugated Polymer with Four Stepwise HOMO Levels for Effective Hole Injection Across Large Barrier 1.4 eV to Core–Shell Quantum Dot Layer for Electroluminescence in Inverted QLED

A novel graded-HOMO-level hole transport polymer (g-HTP) is proposed for the first time with spiro-polyfluorene (sPF) as the main chain and the three hole-transporting moieties triphenyl amine (TPA), carbazole (Cz), and N,N′-dicarbazolyl-3,5-benzene (mCP) as side chains for effective hole injection across the large barrier 1.4 eV into the green-emission core–shell quantum dot (QD) CdSe/ZnS emission layer in inverted QD light-emitting diode (i-QLED): ITO/ZnO/QD/HTP/MoO₃/Al, in which both oleophilic ligands (OA and TOP) in the QD are partially removed from QD surface by annealing at 270 °C for preventing dissolution by solvent in subsequent coating of hole transport material (HTM) solutions atop and also improving electron and hole mobilities, especially the former. The proposed g-HTP with various m:n mole ratios of mCP to TPA/Cz moieties along with various reported HTMs (PVK, Poly-TPD and TFB) are investigated. Among them, the proposed g-HTP with the comonomer mole ratio 1:1 gives the best performance η_max 36.1 cd A⁻¹ and B_max 208 600 cd m⁻², which is the highest performance among the reported i-QLEDs with single hole-transport layer ever documented. In addition, its efficiency roll off is low from 35.8 cd A⁻¹ at 10 000 cd m⁻² to 31.1 cd A⁻¹ at 100 000 cd m⁻².

更新日期：2022-04-05

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南