High density GaN/AlN quantum dots for deep UV LED with high quantum efficiency and temperature stability

Weihuang Yang, Jinchai Li*, Yong Zhang, Po Kai Huang, Tien-Chang Lu, Hao-Chung Kuo, Shuping Li, Xu Yang, Hangyang Chen, Dayi Liu, Junyong Kang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

High internal efficiency and high temperature stability ultraviolet (UV) light-emitting diodes (LEDs) at 308 nm were achieved using high density (2.5 x 109 cm-2) GaN/AlN quantum dots (QDs) grown by MOVPE. Photoluminescence shows the characteristic behaviors of QDs: nearly constant linewidth and emission energy, and linear dependence of the intensity with varying excitation power. More significantly, the radiative recombination was found to dominant from 15 to 300 K, with a high internal quantum efficiency of 62% even at room temperature.

Original languageEnglish
Article number5166
JournalScientific reports
Volume4
DOIs
StatePublished - 5 Jun 2014

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