RGB Arrays for Micro-Light-Emitting Diode Applications Using Nanoporous GaN Embedded with Quantum Dots

Jin Ho Kang, Bingjun Li, Tianshuo Zhao, Muhammad Ali Johar, Chien Chung Lin, Yen Hsiang Fang, Wei Hung Kuo, Kai Ling Liang, Shu Hu, Sang Wan Ryu, Jung Han

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The multiple light scattering of nanoporous (NP) GaN was systematically studied and applied to the color down-conversion for micro-light-emitting diode (LED) display applications. The transport mean free path (TMFP) in NP GaN is 660 nm at 450 nm (light wavelength), and it decreases with a decreasing wavelength. It was observed that the short TMFP of the NP GaN increased the light extinction coefficient at 370 nm by 11 times. Colloidal QDs were loaded into a half 4″ wafer scale NP GaN, and 96 and 100% of light conversion efficiencies for green and red were achieved, respectively. By loading green and red QDs selectively into NP GaN mesas, we demonstrated the RGB microarrays based on the blue-violet pumping light with green and red color converting regions.

Original languageEnglish
Pages (from-to)30890-30895
Number of pages6
JournalACS Applied Materials and Interfaces
Volume12
Issue number27
DOIs
StatePublished - 8 Jul 2020

Keywords

  • color down-conversion
  • light scattering
  • micro-LED display
  • nanoporous GaN
  • quantum dot

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