Study of laser-debonded GaN light emitting diodes

C. P. Chan, T. M. Yue, C. Surya, A. M.C. Ng, A. B. Djurišić, C. K. Liu, M. Li

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We report experimental investigation of laser-assisted debonding of GaN-based light emitting diodes (LEDs) grown by metalorganic chemical vapor deposition (MOCVD) on sapphire substrates. The sapphire substrate was debonded from the GaN material using an excimer laser. The unintentionally doped GaN surface was photo-electrochemically (PEC) etched to form hexagonal pyramid hillocks on the surface, using HeCd laser as the light source. The luminous intensities of the debonded and roughened LEDs at different etching time, as a function of different surface roughness, have been reported. In this experiment, the greatest improvement in the luminous intensities has been achieved at 40mins etching and increased by 60% when compared to the LEDs on sapphire. This increase is attributed to the enhancement in photon extraction efficiency.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium Proceedings
Number of pages6
Publication statusPublished - May 15 2006
Externally publishedYes
Event2005 Materials Research Society Fall Meeting - Boston, MA, United States
Duration: Nov 28 2005Dec 2 2005

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Conference2005 Materials Research Society Fall Meeting
CountryUnited States
CityBoston, MA

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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