Output properties of transparent submount packaged flipchip light-emitting diode modules

Preetpal Singh, Der Hwa Yeh, Cher Ming Tan, Chao Sung Lai, Chih Teng Hou, Ting Yu Chao, Liann Be Chang*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

2 Scopus citations


Flip chip technology has been widely adopted in modern power light-emitting diode (LED) fabrications and its output efficiency is closely related to the submount material properties. Here, we present the electrical, optical and thermal properties of flip chip light-emitting diodes mounted on transparent sapphire and borosilicate glass which have shown a higher output luminous flux when compared to the traditional non-transparent mounted LEDs. Exhibiting both better thermal conductivity and good optical transparency, flip chip LEDs with a sapphire submount showed superior performance when compared to the non-transparent silicon submount ones, and also showed better optical performance than the flip chip LEDs mounted on transparent but poor-thermal-conducting glass substrates. The correspondent analysis was carried out using ANSYS 14 to compare the experimental thermal imaging with the simulation results. TracePro software was also used to check the output luminous flux dependency on different LED mounting designs.

Original languageEnglish
Article number179
JournalApplied Sciences (Switzerland)
Issue number6
StatePublished - 2016


  • Flip chip
  • Light emitting diode
  • Light extraction
  • Transparent submount


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