期刊
ADVANCED OPTICAL MATERIALS
卷 6, 期 15, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201701340
关键词
blue devices; delayed fluorescence; donor units; triscarbazole; upconversion efficiency
The relationship between anisotropic orientation and molecular structure of thermally activated delayed fluorescent (TADF)-based organic light emitting devices (OLEDs) is studied using TADF emitters with carbazole, biscarbazole, and triscarbazole donor units. The bicarbazole and triscarbazole donors are more effective than the carbazole donor in driving the anisotropic orientation of the TADF molecules. A near-perfect in-plane orientation of the TADF dipole moment is demonstrated using the triscarbazole donor. In addition, the triscarbazole donor based OLED shows high photoluminescence quantum yield and an upconversion efficiency close to 100%. As a consequence, an external quantum efficiency >30% is obtained.
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