期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 12, 页码 6438-6443出版社
AMER CHEMICAL SOC
DOI: 10.1021/am506300c
关键词
high efficiency; air stability; electron injection layer; inverted OLED
资金
- 973 Program [2013CB328803, 2013CB328804]
- National Natural Science Foundation of China [61377030]
- Science and Technology Commission of Shanghai Municipal [12JC1404900]
A highly efficient and stable electron injection layer (EIL) for inverted organic light-emitting diodes (OLEDs) is developed. A 1 nm-thick Al is deposited between indium tin oxide cathode and commonly used Cs2CO3 EIL, which can significantly improve the stability. The Al may react with evaporated Cs2CO3 and form a much stabler Al-O-Cs complex, avoiding Cs oxidization by air according to X-ray photoemission spectroscopy measurement. When the Al is evaporated after Cs2CO3 layer, although such a Al-O-Cs complex also forms, the inferior electron injection at Al/4,7-diphenyl-1,10-phenanthroline interface leads to a joule heat-induced resistance that adversely affects the air stability of the device. It is expected that the developed Al/Cs2CO3 EIL promotes high efficiency and stable active-matrix OLEDs based on n-type thin film transistor.
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