Measurements of current spreading length and design of GaN-based light emitting diodes

Hyunsoo Kim, Jaehee Cho, Jeong Wook Lee, Sukho Yoon, Hyungkun Kim, Cheolsoo Sone, Yongjo Park, Tae Yeon Seong

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Abstract

The authors report on the experimental method to measure the current spreading length in GaN-based light emitting diodes (LEDs) based on a one-dimensional current-distribution model neglecting vertical series resistance of the LEDs. It is clearly shown that the measured current spreading length is in good agreement with the calculated results, exhibiting a strong dependence on the injected current density (or forward bias voltage). LEDs fabricated with hybrid p -type reflectors by using the proposed design rule and measured current spreading lengths show enhancement of the output power by 10% as compared to LEDs made with standard reflectors.

Original languageEnglish
Article number063510
JournalApplied Physics Letters
Volume90
Issue number6
DOIs
Publication statusPublished - 2007 Feb 19

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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