Comparative Analysis of Optoelectrical Performance in Laser Lift-Off Process for GaN-Based Green Micro-LED Arrays

Liu，Chuanbiao1,2; Feng，Feng3; Liu，Zhaojun2,3

2023-08-01

10.3390/nano13152213

Nanomaterials   Impact Factor & Quartile

2079-4991

This work explores the pivotal role of laser lift-off (LLO) as a vital production process in facilitating the integration of Micro-LEDs into display modules. We specifically investigate the LLO process applied to high-performance gallium nitride (GaN)-based green Micro-LED arrays, featuring a pixel size of 20 × 38 μm on a patterned sapphire substrate (PSS). Scanning electron microscopy (SEM) observations demonstrate the preservation of the GaN film and sapphire substrate, with no discernible damage. We conduct a comprehensive analysis of the optoelectrical properties of the Micro-LEDs both before and after the LLO process, revealing significant enhancements in light output power (LOP) and external quantum efficiency (EQE). These improvements are attributed to more effective light extraction from the remaining patterns on the GaN backside surface. Furthermore, we examine the electroluminescence spectra of the Micro-LEDs under varying current conditions, revealing a slight change in peak wavelength and an approximate 10% decrease in the full width at half maximum (FWHM), indicating improved color purity. The current–voltage (I–V) curves obtained demonstrate the unchanged forward voltage at 2.17 V after the LLO process. Our findings emphasize the efficacy of LLO in optimizing the performance and color quality of Micro-LEDs, showcasing their potential for seamless integration into advanced display technologies.

GaN-based Micro-LEDs laser lift-off Micro-LED display optoelectrical performance

SCI

English

Corresponding

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:001046280200001

MDPI

2-s2.0-85167670530

Scopus

1.Harbin Institute of Technology,Harbin,150006,China
2.Department of Electrical and Electronic Engineering,The Southern University of Science and Technology,Shenzhen,518000,China
3.Department of Electronic and Computer Engineering,Hong Kong University of Science and Technology,Hong Kong

Liu，Chuanbiao,Feng，Feng,Liu，Zhaojun. Comparative Analysis of Optoelectrical Performance in Laser Lift-Off Process for GaN-Based Green Micro-LED Arrays[J]. Nanomaterials,2023,13(15).

Liu，Chuanbiao,Feng，Feng,&Liu，Zhaojun.(2023).Comparative Analysis of Optoelectrical Performance in Laser Lift-Off Process for GaN-Based Green Micro-LED Arrays.Nanomaterials,13(15).

Liu，Chuanbiao,et al."Comparative Analysis of Optoelectrical Performance in Laser Lift-Off Process for GaN-Based Green Micro-LED Arrays".Nanomaterials 13.15(2023).