3 years ago

Donor-σ-Acceptor Motif Thermally Activated Delayed Fluorescence Emitters with Dual Upconversion

Lin-Song Cui, Anthony D’Aleo, Ko Inada, Yan Geng, Hajime Nakanotani, Jong Uk Kim, Chihaya Adachi
A family of organic emitters having a donor-σ-acceptor (D-σ-A) motif is demonstrated. Based on the weakly coupled D-σ-A intramolecular charge transfer state, a transition from the localized excited triplet states (3LE) and charge transfer triplet states (3CT) to the charge transfer singlet states(1CT) with a small activation energy and high photoluminescence quantum efficiency is accomplished. Two thermally activated delayed fluorescence (TADF) components are identified, one of which has a very short lifetime of 200-400 ns and another a longer TADF lifetime of the µs order. In particular, two D-σ-A materials present strong blue emission with TADF properties in toluene. This result will shed light on the molecular design of new TADF emitters having short delayed lifetimes.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201708876

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