期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 21, 页码 10614-10622出版社
AMER CHEMICAL SOC
DOI: 10.1021/am402504g
关键词
OXD; interface; CsF/Al; PHOLED; oxadiazole; white PHOLED
资金
- National Science Council [NSC 101-2628-M-002-004-MY3, NSC 101-2113-M-001-004-MY2]
- Center for Emerging Materials and Advanced Devices, National Taiwan University
We demonstrate high-efficiency small-molecule-based white phosphorescent organic light emitting diodes (PHOLEDs) by single-active-layer solution-based processes with the current efficiency of 17.3 cdA(-1) and maximum luminous efficiency of 8.86 lmW(-1) at a current density of 1 mA cm(-2). The small-molecule based emitting layers are codoped with blue and orange phosphorescent dyes. We show that the presence of CsF/Al at cathodes not only improves electron transport in oxadiazole-containing electron transport layers (ETLs), but also facilitates electron injection through the reacted oxadiazole moiety to reduce interface resistance, which results in the enhancement of current efficiency. By selecting oxadiazole-based materials as ETLs with proper electron injection layer (EIL)/cathode structures, the brightness and efficiency of white PHOLEDs are significantly improved.
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