4.8 Article

Room-Temperature Phosphorescence of Pure Axially Chiral Bicarbazoles

Journal

JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 13, Issue 25, Pages 5838-5844

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c01614

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By designing and preparing highly pure bicarbazole materials, high-performance ultralong room-temperature phosphorescence (RTP) has been achieved. The material also exhibits photoactivated delayed fluorescence and RTP properties, making it a promising tool for rejuvenating carbazole-based RTP.
Ultralong room-temperature phosphorescence (RTP) is greatly important in a series of applications, but obtaining RTP from metal-free organic materials is still an enormous challenge due to the spin-forbidden nature of triplet excitons. Because of its electron-rich nature and easy derivatization, carbazole (Cz) is widely used to build organic RTP and thermally activated delayed fluorescence (TADF) materials. However, Liu et al. (Nat. Mater. 2021, 20, 175) recently demonstrated that the RTP of Cz is induced by charge traps of its isomeric impurity in commercial sources. Here, on the basis of the classical El-Sayed rule and the recently discovered intersystem crossing promotion principles (twisted structure and charge transfer), we designed and prepared highly pure (>99.9%) (R/S)-octahydrobinaphthyl-based bicarbazoles (BiCz) for high-performance RTP (Phi(P) = 23%; tau(p) = 1.09 s). Interestingly, BiCz exhibited photoactivated TADF and RTP in isolated and aggregated states, respectively, and thus would be an efficient tool for rejuvenating Cz-based RTP.

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