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An approach for achieving deep blue thermally activated delayed fluorescence (TADF) is presented. A simple carbazole-pyrimidine compound Cbz-PYR with near-UV emission and simultaneous room-temperature phosphorescence (RTP) was selectively modified by lowering the singlet state energy, simultaneously preserving high triplet energy. The modified compound tCbz-mPYRs was shown to be efficient TADF emitter with 0.5 solid-state emission yield and peak wavelength of 428 nm. When used in OLED device, tCbz-mPYRs based OLED showed electroluminescence with 8.7% external quantum efficiency (EQE) and Commission Internationale de l’Eclairage (CIE) coordinates of (0.16; 0.12).

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This page is a summary of: Achieving efficient deep-blue TADF in carbazole-pyrimidine compounds, Organic Electronics, July 2020, Elsevier,
DOI: 10.1016/j.orgel.2020.105723.
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