ZnSe:Te/ZnSeS/ZnS nanocrystals: an access to cadmium-free pure-blue quantum-dot light-emitting diodes
- Authors
- Bao, Zhen; Jiang, Zhen-Feng; Su, Qiang; Chiu, Hsin-Di; Yang, Heesun; Chen, Shuming; Chung, Ren-Jei; Liu, Ru-Shi
- Issue Date
- 7-Jun-2020
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NANOSCALE, v.12, no.21, pp.11556 - 11561
- Journal Title
- NANOSCALE
- Volume
- 12
- Number
- 21
- Start Page
- 11556
- End Page
- 11561
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/11671
- DOI
- 10.1039/d0nr01019g
- ISSN
- 2040-3364
- Abstract
- Cadmium-free quantum dots (QDs) are attracting considerable research attention because of their low toxicity. However, the bandgap of most cadmium-free QDs avoids the pure-blue region, which leads to difficulty in realizing pure-blue quantum-dot light-emitting diodes (QLEDs). In this work, we successfully tuned the emission wavelength of ZnSe/ZnS quantum dots from the violet region (similar to 420 nm) to the pure-blue region (450-460 nm) by doping Te into the ZnSe core. The ZnSe:0.03Te/ZnSeS/ZnS QD sample with emission at 450 nm and a quantum yield of 30% was the most balanced formula. To overcome the energy gap between the hole-transfer layer and QD layers, a specific hole-transfer layer was developed for normal-structure QLEDs. A QLED with such a structure with ZnSe:0.03Te/ZnSeS/ZnS QDs achieved the pure-blue light emission at 455 nm, a low turn-on voltage of 4.4 V, and an external quantum efficiency of 0.33%. Overall, our cadmium-free QLED achieved pure-blue emission, revealing the potential of ZnSe-based pure-blue QLEDs for future displays.
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Collections - Graduate School > Materials Science and Engineering > 1. Journal Articles
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