Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202116810
Keywords
Forster Energy Transfer; Magneto-Electroluminescence; Near Ultraviolet Light; Organic Light-Emitting Diodes; Reverse Intersystem Crossing
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Funding
- National Natural Science Foundation of China [21788102]
- Natural Science Foundation of Guangdong Province [2019B030301003]
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In this study, we report a short pi-conjugated molecule, POPCN-2CP, which exhibits high thermal and morphological stabilities and strong near ultraviolet photoluminescence. Doped films of POPCN-2CP in different hosts achieve high-purity near ultraviolet light and excellent external quantum efficiencies.
Organic light-emitting diodes (OLEDs) radiating near ultraviolet (NUV) light are of high importance but rarely reported due to the lack of robust organic short-wavelength emitters. Here, we report a short pi-conjugated molecule (POPCN-2CP) with high thermal and morphological stabilities and strong NUV photoluminescence. Its neat film exhibits an electroluminescence (EL) peak at 404 nm with a maximum external quantum efficiency (eta(ext,max)) of 7.5 % and small efficiency roll-off. The doped films of POPCN-2CP in both non-polar and polar hosts at a wide doping concentration range (10-80 wt%) achieve high-purity NUV light (388-404 nm) and excellent eta(ext,max)s of up to 8.2 %. The high-level reverse intersystem crossing improves exciton utilization and accounts for the superb eta(ext,max)s. POPCN-2CP can also serve as an efficient host for blue fluorescence, thermally activated delayed fluorescence and phosphorescence emitters, providing excellent EL performance via Forster energy transfer.
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