Narrow Band Organic Emitter for Pure Green Solution‐Processed Electroluminescent Devices with CIE Coordinate y of 0.77

• DOI: 10.1002/adom.202400490
• Publication Date: 2024-04-09T10:27:39Z
• Authors: Xuming Zhuang; Baoyan Liang; Chao Jiang; Shipan Wang; Hai Bi; Yue Wang

Abstract While the development of solution‐processed organic light‐emitting diodes (sOLEDs) utilizing multiple resonance‐induced thermally activated delayed fluorescence (MR‐TADF) is highly significant, it restricted by limited solubility and film‐forming property resulting from rigid conjugate planarity MR‐TADF materials. Herein, an effective strategy presented to obtain narrowband emitters introducing inert steric bulky hindrance group into resonance skeleton, thereby mitigating issues arising intermolecular packing‐induced poor solution processing ability quenching effects. The target emitter, designed as 3CzSF‐BN, exhibits pure‐green emission with a peak at 520 nm small full width half maximum (FWHM) 30 (0.14) eV. Remarkably, achieves exceptional photoluminescence quantum yield (PLQY) 100% notable advancements in attributes. optimized bottom‐emitting sOLED (BE‐sOLED) device external efficiency (EQE) over 20% Commission Internationale de I’Éclairage (CIE) coordinates (0.214, 0.716). Notably, top‐emitting (TE‐sOLED) ultra‐pure green color FWHM 22 CIE (0.138, 0.771), highlighting effectiveness this designing high‐performance