Enhanced thermal stability of green-emission quantum-dot light-emitting diodes via composition-gradient thick-shell quantum dots

Hoang Tuan Vu, Ray Kuang Chiang, Chun Yuan Huang, Chih Jung Chen, Hsin-Chieh Yu, Jiun Yi Lien, Yan Kuin Su

Research output: Contribution to journalArticlepeer-review

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Abstract

We investigated the thermal properties of quantum-dot light-emitting diodes (QLEDs) using composition-gradient thick-shell CdSe@ZnS/ZnS QDs. Thick-shell QDs with low defective structures effectively prevented electron-hole pairs from nonradiative Auger recombination. More specifically, defects were prevented from thermal-stress-induced expansion at elevated temperatures and high driving currents. Consequently, 97% of EL remained after the device was thermally stressed at temperatures higher than 110 °C, indicating that the nanostructure design of QDs is an important factor for high-performance QLEDs.

Original languageEnglish
Article number082101
JournalApplied Physics Express
Volume9
Issue number8
DOIs
StatePublished - 1 Aug 2016

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