期刊
APPLIED PHYSICS LETTERS
卷 96, 期 15, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3400224
关键词
doping; II-VI semiconductors; nanoparticles; organic compounds; organic light emitting diodes; phosphorescence; transparency; wide band gap semiconductors; work function; zinc compounds
资金
- Ministry of Knowledge Economy (MKE) of Korea [A1100-0901-1750]
- Brain Korea 21 Project
We fabricated highly efficient iridium(III) bis[(4,6-di-fluorophenyl)-pyridinato-N,C2(')] picolinate doped inverted bottom-emission blue phosphorescent organic light-emitting diodes, with an electron injection layer of zinc oxide (ZnO) nanoparticles (NPs). The ZnO NPs layer lowers the turn-on voltage by about 4 V and significantly enhances the efficiency. The device with ZnO NPs shows peak efficiencies of 16.5 cd/A and 8.2%, about three times higher than those of the device without ZnO NPs. Since the ZnO NPs layer has a wide band gap, good electron transporting properties and low work function, it can be utilized as an effective electron injection layer with good transparency.
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