Simple Molecular Design Strategy for Multiresonance Induced TADF Emitter: Highly Efficient Deep Blue to Blue Electroluminescence with High Color Purity
Simple Molecular Design Strategy for Multiresonance Induced TADF Emitter: Highly Efficient Deep Blue to Blue Electroluminescence with High Color Purity
复制标题
多共振诱导 TADF 发射器的简单分子设计策略：具有高颜色纯度的高效深蓝到蓝色电致发光
DOI：
10.1002/adom.202102092
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发表时间：
2021-12-13
影响因子：
9
通讯作者：
Yang, Chuluo
中科院分区：
文献类型：
--
作者：
Han, Jianmei;Huang, Zhongyan;Yang, Chuluo
Thermally activated delayed fluorescence (TADF) materials based on multiple resonance (MR) effect exhibit enormous potentials in organic light-emitting diodes (OLEDs) with high color purity due to their intrinsically narrow emission. However, most of MR-TADF emitters are limited to the boron-nitrogen-based rigid skeleton. In this work, three novel MR-TADF emitters, namely CzBNO, DMAcBNO and DPAcBNO, are elaborately constructed, the TADF properties of which are realized by virtue of opposite MR effect of boron and nitrogen/oxygen atom. CzBNO-based deep blue-emitting OLEDs achieve a maximum external quantum efficiency (EQE) of 13.6% with a small FWHM of 36 nm, as well as a Commission Internationale de l'Eclairage (CIE) coordinate of (0.14,0.08). While the other two emitter-based devices exhibit blue emission with a maximum EQE of up to 23.0%. To further improve the OLEDs performances, DMAcBNO and DPAcBNO-based devices assisted by a sensitizer exhibit an excellent EQE of up to 29.6% with a relatively small efficiency roll-off.
