期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 6, 期 30, 页码 8219-8225出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc02936a
关键词
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资金
- European Union [H2020-MSCA-ITN-2015/674990 EXCILIGHT]
- National Science Centre, Poland, (NCN) [2015/17/B/ST5/00179]
- EU's Horizon 2020 [691684, 641725]
- EPSRC [EP/L02621X/1, EP/K016164/1] Funding Source: UKRI
It is demonstrated that a naphthalene diimide core disubstituted with triphenylamine can be used as a thermally activated delayed fluorescence emitter in organic Eight emitting diodes. Detailed spectroscopic studies demonstrated unusual host effects on the photophysical properties of this material. In particular, we were able to deduce recombination pathways and the role of the host and temperature in increasing/decreasing the TADF contribution in overall emission. Furthermore, stemming from these host effects on the geometry of the emitter we discover different local triplet states involved in the TADF mechanism. We elucidate this confusing situation to show that simply measuring low-temperature phosphorescence does not always give the energy of the local triplet involved in TADF. The studies carried out in a nonpolar polymer and the OLED host were completed by NIR OLED fabrication showing promising characteristics.
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