Color Conversion of GaN-Based Micro Light-Emitting Diodes Using Quantum Dots

Ching Ting Lee, Chao Jung Cheng, Hsin Ying Lee, Ying Chien Chu, Yen Hsiang Fang, Chia Hsin Chao, Ming Hsien Wu

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Using CdSe/ZnS quantum dots (QDs) excited by the blue light emission of GaN-based micro light-emitting diodes (LEDs), quasi-monochromatic red light sources with emission wavelength of 625 nm were obtained. In order to enhance the blue light emission of GaN-based LEDs for further excitation of QDs, distributed/hybrid Bragg reflectors and zinc oxide (ZnO) nanorod array were, respectively, introduced to the top/bottom and top sides of GaN-based micro LEDs. The presence of ZnO nanorod array helps to channel the blue light to pump the CdSe/ZnS QDs for enhancing the red light emission. The electroluminescence of micro QDs-LEDs with reflectors and ZnO nanorod array was increased by 57.4% compared with the micro QDs-LEDs alone. The international commission on illumination chromaticity coordinate of the micro QDs-LEDs with reflectors and ZnO nanorod array was very close to the red light emission at (0.59, 0.26).

Original languageEnglish
Article number7181677
Pages (from-to)2296-2299
Number of pages4
JournalIEEE Photonics Technology Letters
Volume27
Issue number21
DOIs
Publication statusPublished - 2015 Nov 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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