Mechanism and thermal effect of delamination in light-emitting diode packages

Jianzheng Hu, Lianqiao Yang, Moo Whan Shin

Research output: Contribution to journalArticle

99 Citations (Scopus)

Abstract

This work reports on the mechanism of delamination in light-emitting diode (LED) packages and its effects on thermal characteristics of LEDs. The LED samples were subjected to moisture preconditioning followed by heat block testing. Transient thermal measurements were performed to investigate the thermal behavior of the delaminated LEDs. Increase of thermal resistance with the degree of delamination was observed from the transient measurement. The thermo-mechanical and hygro-mechanical stress distributions calculated from coupled-field FEA simulation agree well with the micrographical evidence. It was found that the thermo-mechanical stress plays more important role than the hygro-mechanical stress for the development of delamination in the LED packages. Moisture preconditioning for 3 and 6 h under 85 °C/85RH conditions was found to make little contribution to the delamination between the chip and lead frame.

Original languageEnglish
Pages (from-to)157-163
Number of pages7
JournalMicroelectronics Journal
Volume38
Issue number2 SPEC. ISS.
DOIs
Publication statusPublished - 2007 Feb

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering

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