Local nanotip arrays sculptured by atomic force microscopy to enhance the light-output efficiency of GaN-based light-emitting diode structures

Chun Ying Huang, Yung Chi Yao, Ya-Ju Lee, Tai Yuan Lin, Wen Jang Kao, Jih Shang Hwang, Ying Jay Yang, Ji Lin Shen

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    In this work, local nanotip arrays on GaN-based light-emitting (LED) structures were fabricated through nano-oxidation using an atomic force microscope (AFM). The photoluminescence (PL) intensity of the InGaN/GaN multiple quantum wells (MQWs) active layer and the light extraction efficiency of the LED structure were enhanced by forming this nanotips structure to serve as a graded-refractive index layer, which is further validated by the finite-difference time-domain analysis. The PL emission peak of the MQWs active layer has a blue-shift phenomenon that is caused by a partial reduction of the strain on the InGaN well. It is expected that our approach opens a promising route for simultaneously enhancing both the internal quantum efficiency and the light extraction efficiency of GaN-based LEDs. The proposed AFM-based method will be of importance for local patterning the light emitting components for optoelectronic applications.

    Original languageEnglish
    Article number195401
    JournalNanotechnology
    Volume25
    Issue number19
    DOIs
    Publication statusPublished - 2014 May 16

    Keywords

    • atomic force microscopy
    • light extraction efficiency
    • nanotips

    ASJC Scopus subject areas

    • Bioengineering
    • Chemistry(all)
    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering
    • Electrical and Electronic Engineering

    Fingerprint

    Dive into the research topics of 'Local nanotip arrays sculptured by atomic force microscopy to enhance the light-output efficiency of GaN-based light-emitting diode structures'. Together they form a unique fingerprint.

    Cite this