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Published on: October 24, 2017
Achieving Charge-Transfer-Featured Organic Room-Temperature Phosphorescence with Combined High Efficiency and Long
Kuan Chen1,2, Binhao Li1, Chuanhao Liu3
1Key Laboratory of Green Chemistry and Technology (Ministry of Education), College of Chemistry, Sichuan University, Chengdu, 610064, China.
Abstract:
The realization of long-lived charge-transfer-based organic room-temperature phosphorescence (3CT-RTP, τPh = 210 ms) via the construction of U-shaped donor-acceptor (D-A) dyads is impeded by suboptimal phosphorescence efficiency ( = 6%). Herein, we reveal that modifying the skeleton of D-A dyads from U-shaped to V-shaped configurations yields 3CT-RTP with both long τPh (150-220 ms) and high (13%-25%). This improvement stems from preserving a substantial degree of forbiddenness in the radiative transition process of the compound while simultaneously increasing its D-A dihedral angle, which can promote more efficient spin-orbit coupling and thus more rapid intersystem crossing. Additionally, augmenting the framework rigidity of a V-shaped D-A dyad can potentially reduce the non-radiative transition rate constant of triplet excitons (knr,T), thereby facilitating the attainment of long τPh and high .
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