Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 10, Issue 11, Pages 4393-4401Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1tc06125a
Keywords
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Funding
- National Natural Science Foundation of China [51773141, 51873139, 61961160731, 62175171, 22175124]
- Suzhou Science and Technology Plan Project [SYG202010]
- Suzhou Key Laboratory of Functional Nano Soft Materials
- Collaborative Innovation Center of Suzhou Nano Science Technology
- 111 Project
- Joint International Research Laboratory of Carbon-Based Functional Materials and Devices
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This study presents the first ever circularly polarized thermally activated delayed fluorescence molecule with a carbonyl-/sulfone-bridged triarylamine structure. Circularly polarized light emission is achieved through intramolecular steric hindrance and intramolecular space charge transfer. The molecule exhibits good quantum yield and clear circularly polarized luminescence in solution.
This work presents the first circularly polarized thermally activated delayed fluorescence hetero-[4]helicene with a carbonyl-/sulfone-bridged triarylamine structure (QPO-PhCz), demonstrating circularly polarized light emission through effective intramolecular steric hindrance and intramolecular space charge transfer. The new molecular architecture displays a good quantum yield (0.51) and clearly circularly polarized luminescence with an absolute luminescence dissymmetry factor of 1.2 x 10(-3) in dichloromethane solution. Moreover, for their racemates, characterization of the electroluminescence device shows a sky-blue emission (488 nm) and a maximum external quantum efficiency of 10.6%. Finally, the circularly polarized organic light-emitting diodes exhibit circularly polarized electroluminescence signals with an electroluminescence dissymmetry factor of +1.6 x 10(-3) and -1.1 x 10(-3) for (M)-QPO-PhCz and (P)-QPO-PhCz, respectively.
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