有机发光二极管
电致发光
材料科学
分子间力
荧光
猝灭(荧光)
兴奋剂
磷光
共发射极
光电子学
分子
纳米技术
近红外光谱
光化学
化学
光学
物理
有机化学
图层(电子)
作者
Hui Wang,Kai Wang,Jia‐Xiong Chen,Xi Zhang,Lu Zhou,Xiucai Fan,Ying‐Chun Cheng,Xuerui Hao,Jia Yu,Shun Zhang
标识
DOI:10.1002/adfm.202304398
摘要
Abstract Deep‐red/near‐infrared (DR/NIR) organic light‐emitting diodes (OLEDs) are promising for applications such as night‐vision readable marking, bioimaging, and photodynamic therapy. To tune emission spectra into the DR/NIR region, red emitters generally require assistance from intermolecular interactions. But such interactions generally lead to sharp efficiency declines resulting from unwanted quenching events. To overcome this challenge, herein, an advanced method via strategically managing the intermolecular interactions of thermally activated delayed fluorescence (TADF) emitters is proposed. The proof‐of‐concept molecule called DCN‐SPTPA exhibits impressive resistance to quenching while delivering controllable aggregation behavior for redshifting the emission by installing an end‐spiro group. Consequently, two emitters demonstrate similar photophysical properties and device performance at very low doping levels; while DCN‐SPTPA ‐based OLEDs demonstrate a 1.3–1.4‐fold enhancement of the external quantum efficiencies (EQEs) with respect to the control molecule at 5–20 wt.% doping ratios, affording DR/NIR emission at 656, 688, 696, and 716 nm with record‐breaking EQEs of 36.1%, 29.3%, 28.2%, and 24.0%, respectively. Moreover, DCN‐SPTPA ‐based nondoped NIR device also retains a state‐of‐the‐art EQE of 2.61% peaked at 800 nm. This work first demonstrates instructive guidance for accurately manipulating the intermolecular interactions of red TADF emitters, which will spur future developments in high‐performance DR/NIR OLEDs.
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