Multi-stacked organic light-emitting diodes using zinc oxide nanoparticle interfacial layers |
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| Authors: | Seung Yoon Ryu Sung Hyun Kim Chang Su Kim Sungjin Jo Jun Yeob Lee |
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| Institution: | 1. Advanced Functional Thin Films Department, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Seongsangu, Changwon 641-831, Republic of Korea;2. Department of Advanced Materials Engineering for Information & Electronics, Kyung Hee University, YoungIn, Gyeonggi-do 446-701, Republic of Korea;3. Kyungpook National University, School of Energy Engineering 1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Republic of Korea;4. Department of Polymer Science and Engineering, Dankook University, Yongin-City, Gyeonggi-Do 448-701, Republic of Korea |
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| Abstract: | Stacked organic light-emitting diodes (SOLEDs) with 30-nm nanoparticle (NP) interfacial layers were investigated. Zinc oxide (ZnO) was used as an interfacial layer between two green polymer (GP) layers. SOLEDs with NP interfacial layers had higher device efficiency than did a single-unit device due to the high probability of exciton recombination that originated from the Auger electron-assisted energy up-conversion process. Although the current density and luminance of SOLEDs with ZnO NP interfacial layers were smaller than those of the reference device, the efficiency was doubled because of the big band alignment difference and the large band gap between GP and ZnO NP interfacial layers, which induced more radiative-exciton recombination. |
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