High‐Efficiency Red Organic Light‐Emitting Diodes with External Quantum Efficiency Close to 30% Based on a Novel Thermally Activated Delayed Fluorescence Emitter
Researchers have spared no effort to design new thermallyactivateddelayedfluorescence (TADF) emitters for high-efficiency organic light-emitting diodes (OLEDs). However, efficient long-wavelength TADF emitters are rarely reported. Herein, a red TADF emitter, TPA-PZCN, is reported, which possesses a high photoluminescence quantum yield (ΦPL ) of 97% and a small singlet-triplet splitting (ΔEST ) of
Near‐IR organic light‐emitting diodes (NIR‐OLEDs) are potential light‐sources for various sensing applications as OLEDs have unique features such as ultra‐flexibility and low‐cost fabrication. However, the low external electroluminescence (EL) quantumefficiency (EQE) of NIR‐OLEDs is a critical obstacle for potential applications. Here, we demonstrate a highly efficient NIR emitter with thermally activated
Study of multi-electron redox mechanism <i>via</i> electrochromic behavior in hexaazatrinaphthylene-based polymer as the cathode of lithium–organic batteries
challenging issue due to the lack of popularity of in situ characterization technology during the charge/discharge process. In this article, a novel open lithium battery test combining the in situ electrochemical and UV spectral tests is firstly studied to explore the multi-electronredox mechanism of hexaazatrinaphthylene-based polymers as a cathode of lithium–organic batteries. Two triphenylamine-hexanazonaphthalene
由于充放电过程中的原位表征技术缺乏普及,锂有机电池的充放电机制一直是一个具有挑战性的问题。本文首先研究了一种结合原位电化学和紫外光谱测试的新型开放式锂电池测试,以探索六氮杂三萘基聚合物作为锂有机电池正极的多电子氧化还原机制。合成了两种三苯胺-六氮杂萘结构共轭微孔聚合物(PTPA-HATN 和 PDTPA-HATN)作为模型研究六氮杂萘的充放电机理。两者都具有相似的纳米球形态和高表面积(~450 mA hg -1) 以及丰富的微孔结构。使用它们作为正极来探索锂电池的性能,在两者中都可以观察到明显的具有多电子氧化还原特性的充放电过程,并且具有 PTPA-HATN 的具有更高的放电容量(~168 mA hg -1)和在 LiClO 4电解质中,比 PDTPA-HATN 的倍率性能更好。结合原位电化学和紫外光谱结果,提出了一种新的六氮萘基聚合物正极在锂有机电池中的多电子氧化还原机制。与之前报道的机理不同,聚合物薄膜中六氮萘基团的
Highly efficient red thermally activated delayed fluorescence materials based on a cyano-containing planar acceptor
A highly efficient red thermally activated delayed fluorescence material was realized via the introduction of multiple acceptor units into a rigid backbone.