Pyridyl Pyrrolide Boron Complexes: The Facile Generation of Thermally Activated Delayed Fluorescence and Preparation of Organic Light‐Emitting Diodes |
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| Authors: | Yi‐Jiun Shiu Yung‐Chen Cheng Wei‐Lung Tsai Prof. Chung‐Chih Wu Chun‐Tien Chao Dr. Chin‐Wei Lu Prof. Yun Chi Yi‐Ting Chen Dr. Shih‐Hung Liu Prof. Pi‐Tai Chou |
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| Affiliation: | 1. Graduate Institute of Electronics Engineering and Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan;2. Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan;3. Department of Chemistry, National Taiwan University, Taipei, Taiwan |
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| Abstract: | 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 (ΔET‐S) and thereby the generation of thermally activated delay fluorescence (TADF). |
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| Keywords: | boron OLEDs photoluminescence thermally activated delay fluorescence |
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