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Pyridyl Pyrrolide Boron Complexes: The Facile Generation of Thermally Activated Delayed Fluorescence and Preparation of Organic Light‐Emitting Diodes
Author(s) -
Shiu YiJiun,
Cheng YungChen,
Tsai WeiLung,
Wu ChungChih,
Chao ChunTien,
Lu ChinWei,
Chi Yun,
Chen YiTing,
Liu ShihHung,
Chou PiTai
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201509231
Subject(s) - triphenylamine , homo/lumo , photochemistry , boron , chemistry , excited state , electron acceptor , fluorescence , atomic orbital , molecular orbital , singlet state , electron donor , molecule , electron , atomic physics , organic chemistry , catalysis , physics , quantum mechanics
The electron positive boron atom usually does not contribute to the frontier orbitals for several lower‐lying electronic transitions, and thus is ideal to serve as a hub for the spiro linker of light‐emitting molecules, such that the electron donor (HOMO) and acceptor (LUMO) moieties can be spatially separated with orthogonal orientation. On this basis, we prepared a series of novel boron complexes bearing electron deficient pyridyl pyrrolide and electron donating phenylcarbazolyl fragments or triphenylamine. The new boron complexes show strong solvent‐polarity dependent charge‐transfer emission accompanied by a small, non‐negligible normal emission. The slim orbital overlap between HOMO and LUMO and hence the lack of electron correlation lead to a significant reduction of the energy gap between the lowest lying singlet and triplet excited states (Δ E T‐S ) and thereby the generation of thermally activated delay fluorescence (TADF).