Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 122, Issue 32, Pages 18376-18382Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.8b07083
Keywords
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Funding
- National Basic Research Program of China [2015CB655003, 2016YFB0401001]
- National Natural Science Foundation of China [51673083, 51473063]
- Postdoctoral Innovation Talent Support Project [BX20170097, BX20180121]
- China Postdoctoral Science Foundation [2017M620108]
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Excited-state properties (characteristics and composition) play a crucial role in luminescence properties of the new-generation organic light-emitting materials. As a special excited species, the hybridized local and charge-transfer (HLCT) state is composed of locally excited (LE) state and charge-transfer (CT) state, which can harvest simultaneous high photoluminescence (PL) efficiency and high exciton utilization in organic light-emitting diodes. In this work, we designed and synthesized three donor (D)-acceptor (A) compounds with different donor units and a typical electron-deficient unit acridine as the acceptor unit to investigate the different hybridization statuses among them. As is revealed by the molecular design, the three compounds precisely show the different hybridization statuses: LE-dominated hybridization (CZP-1AC), quasi-equivalent HLCT (qHLCT, TPA-1AC), and CT-dominated hybridization (PTZ-1AC). As a result, TPA-1AC exhibits the highest PL efficiency and multifold device performance, meriting from the most effective suppression of nonradiative processes that originated from a qHLCT state due to the strong interstate coupling and the small energy gap between LE and CT states. This work not only provides a comprehensive insight into the hybridization formation and a fine modulation in HLCT state composition but also provides a valuable strategy to design new-generation, low-cost, high-performance organic electroluminescence materials based on lowly emissive chromophores of D or A.
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