Spontaneous exciton dissociation enables spin state interconversion in delayed fluorescence organic semiconductors

• Published in: Nature communications Vol. 12; no. 1; pp. 6640 - 10
• Main Authors: Gillett, Alexander J., Tonnelé, Claire, Londi, Giacomo, Ricci, Gaetano, Catherin, Manon, Unson, Darcy M. L., Casanova, David, Castet, Frédéric, Olivier, Yoann, Chen, Weimin M., Zaborova, Elena, Evans, Emrys W., Drummond, Bluebell H., Conaghan, Patrick J., Cui, Lin-Song, Greenham, Neil C., Puttisong, Yuttapoom, Fages, Frédéric, Beljonne, David, Friend, Richard H.
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 17.11.2021; Nature Publishing Group; Nature Portfolio
• Subjects: 140/125; 639/301/1019/1020/1091; 639/624/1020/1091; Absorption; Absorptivity; Charge transfer; Chemical Sciences; Emitters; Energy gap; Excitons; Fluorescence; Holes (electron deficiencies); Humanities and Social Sciences; Magnetic resonance; Material chemistry; multidisciplinary; or physical chemistry; Orbital resonances (celestial mechanics); Organic semiconductors; Photoluminescence; Photons; Science; Science (multidisciplinary); Semiconductors; Spin-orbit interactions; Theoretical and; Organic LEDs

Engineering a low singlet-triplet energy gap ( ΔE ST ) is necessary for efficient reverse intersystem crossing (rISC) in delayed fluorescence (DF) organic semiconductors but results in a small radiative rate that limits performance in LEDs. Here, we study a model DF material, BF2, that exhibits a st...