Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202115515
Keywords
Blue emission; Dinuclear Platinum; (MLCT)-M-3; OLEDs; Tether
Categories
Funding
- Innovation and Technology Commission (HKSAR, China)
- Guangdong Major Project of Basic and Applied Basic Research [2019B030302009]
- Basic Research Program of Shenzhen [JCYJ20180508162429786, JCYJ20200109150414471]
- Shunde Science and Technology Bureau [2030218000158]
- Innovation and Technology Commission, Centre of Machine Learning for Energy Materials and Devices, a major initiative-Artificial Intelligence and Robotics cluster under InnoHK (AIR@InnoHK)
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We synthesized and characterized a new class of dinuclear Pt-II complexes with blue phosphorescence. Bulky N-heterocyclic carbene and tethered bridging ligands were used to suppress photo-induced structural changes and improve the thermal stability of the complexes. These complexes exhibited high emission efficiency, long emission lifetime, and good performance in thin films.
Here we describe the synthesis and characterization of a new class of dinuclear Pt-II complexes with blue phosphorescence. Bulky N-heterocyclic carbene and tethered bridging ligands were employed to suppress photo-induced structural changes and to improve thermal stability of the complexes. These complexes show mixed (IL)-I-3/(MLCT)-M-3 blue emission (approximate to 460 nm) with emission quantum yields of up to 0.95, emission lifetimes of as low as 1.3 mu s and radiative decay rate constants of up to 7.3x10(5) s(-1) in 4 wt % doped PMMA films; the latter is attributed to a (MLCT)-M-1 excited state having high metal character (resulting in a large SOC) and a large transition dipole moment, based on DFT calculations. Phosphor-sensitized blue hyper-OLEDs with Commission Internationale de L'Eclairage (CIE) coordinates of (0.13, 0.12) showed a maximum EQE of 23.4 % with a full-width-at-half-maximum of 18 nm and a LT50 >250 h at an L-0 of 1000 cd m(-2).
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