Transparent InP Quantum Dot Light-Emitting Diodes with ZrO2 Electron Transport Layer and Indium Zinc Oxide Top Electrode
- Authors
- Kim, Hee Yeon; Park, Yu Jin; Kim, Jiwan; Han, Chul Jong; Lee, Jeongno; Kim, Yohan; Greco, Tonino; Ippen, Christian; Wedel, Armin; Ju, Byeong-Kwon; Oh, Min Suk
- Issue Date
- 24-5월-2016
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- InP; light emitting diode; quantum dot; transparent; ZrO2
- Citation
- ADVANCED FUNCTIONAL MATERIALS, v.26, no.20, pp.3454 - 3461
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED FUNCTIONAL MATERIALS
- Volume
- 26
- Number
- 20
- Start Page
- 3454
- End Page
- 3461
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/88620
- DOI
- 10.1002/adfm.201505549
- ISSN
- 1616-301X
- Abstract
- Because of outstanding optical properties and non-vacuum solution processability of colloidal quantum dot (QD) semiconductors, many researchers have developed various light emitting diodes (LEDs) using QD materials. Until now, the Cd-based QD-LEDs have shown excellent properties, but the eco-friendly QD semiconductors have attracted many attentions due to the environmental regulation. And, since there are many issues about the reliability of conventional QD-LEDs with organic charge transport layers, a stable charge transport layer in various conditions must be developed for this reason. This study proposes the organic/inorganic hybrid QD-LEDs with Cd-free InP QDs as light emitting layer and inorganic ZrO2 nanoparticles as electron transport layer. The QD-LED with bottom emission structure shows the luminescence of 530 cd m(-2) and the current efficiency of 1 cd/A. To realize the transparent QD-LED display, the two-step sputtering process of indium zinc oxide (IZO) top electrode is applied to the devices and this study could fabricate the transparent QD-LED device with the transmittance of more than 74% for whole device array. And when the IZO top electrode with high work-function is applied to top transparent anode, the device could maintain the current efficiency within the driving voltage range without well-known roll-off phenomenon in QD-LED devices.
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