期刊
ADVANCED MATERIALS
卷 32, 期 42, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202004040
关键词
all-fluorescent devices; exciplex-forming hosts; high power efficiency; long lifetime; white organic light-emitting diodes
类别
资金
- National Key Basic Research and Development Program of China [2016YFB0400702]
- National Natural Science Foundation of China [51525304, 51903137, U1601651, 61890942]
- Guangdong Major Project of Basic and Applied Basic Research [2019B030302009]
- Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory [XHT2020-005]
Exciplex-forming hosts with thermally activated delayed fluorescence (TADF) provide a viable opportunity to unlock the full potential of the yet-to-be improved power efficiencies (PEs) and stabilities of all-fluorescent white organic light-emitting diodes (WOLEDs), but this, however, is hindered by the lack of stable blue exciplexes. Here, an advanced exciplex system is proposed by incorporating bipolar charge-transport pi-spacers into both the electron-donor (D) and the electron-accepter (A) to increase their distance for hypsochromic-shifted emission while maintaining the superior transporting ability. By using spirofluorene as the pi-spacer, 3,3 '-bicarbazole as the D-unit, and 2,4,6-triphenyl-1,3,5-triazine as the A-unit, a pi-D and pi-A exciplex with sky-blue emission and fast reverse intersystem crossing process is thereof constructed. Combining this exciplex-forming host, a blue TADF-sensitizer, and a yellow conventional fluorescent dopant in a single-emissive-layer, the fabricated warm-white-emissive device simultaneously exhibits a low driving voltage of 3.08 V, an external quantum efficiency of 21.4%, and a remarkable T80 (time to 80% of the initial luminance) of >8200 h at 1000 cd m(-2), accompanied by a new benchmark PE of 69.6 lm W(-1)among all-fluorescent WOLEDs.
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