Improvement of electron injection in inverted bottom-emission blue phosphorescent organic light emitting diodes using zinc oxide nanoparticles
- Authors
- Lee, Hyunkoo; Park, Insun; Kwak, Jeonghun; Yoon, Do Y.; Lee, Changhee
- Issue Date
- Apr-2010
- Publisher
- AMER INST PHYSICS
- Citation
- APPLIED PHYSICS LETTERS, v.96, no.15
- Journal Title
- APPLIED PHYSICS LETTERS
- Volume
- 96
- Number
- 15
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/147980
- DOI
- 10.1063/1.3400224
- ISSN
- 0003-6951
1077-3118
- Abstract
- 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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