期刊
ADVANCED OPTICAL MATERIALS
卷 8, 期 20, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202000775
关键词
chiral liquid crystals; circularly polarized luminescence; organic light-emitting diodes; phosphorescence; platinum complexes
资金
- National Natural Science Foundation of China [51773021, 51911530197, U1663229, 51473140, 51673050, 91856115]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB36000000]
- Ministry of Science and Technology of the People's Republic of China [2016YFA0203400, 2017YFA0206600]
- Six talent peaks project in Jiangsu Province [XCL-102]
- Natural Science Fund for Colleges and Universities in Jiangsu Province [19KJA430002]
- Royal Society
- NSFC
- Talent project of Jiangsu Specially Appointed Professor
Circularly polarized luminescence (CPL) is of interest due to its wide potential application in semiconductors. To balance the emission efficiency and luminescence dissymmetry factor (g(PL)) of a CPL emitter, in this context, two chiral, phosphorescent and liquid-crystalline cyclometalated platinum complexes, abbreviatedR-Pt andS-Pt, are prepared. The complexes, which show an intense green emission at 504 nm both in solution and in the solid state, contain a simple,ortho-metalated 2-phenylpyridine unit functionalized with a chiral 2-octanol chain, with liquid crystallinity being induced by modifying the beta-diketonato ligand with mesogenic groups. Interestingly, both the chiral smectic (SmA*) and nematic (N*) phases are found by a combination of polarized optical microscopy, differential scanning calorimetry, and small-angle X-ray scattering. By annealing, distinct CPL emission is achieved in the solid state with ag(PL)around 0.02. Employing the chiral platinum complexes as the dopant, solution-processable organic light-emitting diodes present an external quantum efficiency of 11.3% and strong, circularly polarized electroluminescence with an extremely high luminescence dissymmetry value (g(EL)) of 0.06 after annealing at 100 degrees C. This work opens an avenue for designing CPL-active emitters with high emission efficiency and high dissymmetry factor.
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