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Journal of Display Technology

Journal of Display Technology


  • Vol. 9, Iss. 4 — Apr. 1, 2013
  • pp: 266–271

Lateral Current Spreading Effect on the Efficiency Droop in GaN Based Light-Emitting Diodes

Shanjin Huang, Bingfeng Fan, Zimin Chen, Zhiyuan Zheng, Hongtai Luo, Zhisheng Wu, Gang Wang, and Hao Jiang

Journal of Display Technology, Vol. 9, Issue 4, pp. 266-271 (2013)

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The lateral current spreading (CS) effect on the efficiency droop in GaN-based LEDs has been studied in terms of the CS distance (Lcs) using a designed pattern with the 2-D current spreading profile. The correlations of CS effect with the electrical, luminescent and electric-thermal properties of the LEDs have been discussed. LEDs with the Lcs longer than the theoretically calculated effective CS length (Leff) suffer from more serious efficiency droop and the degradation of luminescent properties. However, the influence of CS effect on the ideality factors of LEDs is not obvious. Higher chip temperature caused by poor CS was observed and may further enlarge the efficiency droop.

© 2013 IEEE

Shanjin Huang, Bingfeng Fan, Zimin Chen, Zhiyuan Zheng, Hongtai Luo, Zhisheng Wu, Gang Wang, and Hao Jiang, "Lateral Current Spreading Effect on the Efficiency Droop in GaN Based Light-Emitting Diodes," J. Display Technol. 9, 266-271 (2013)

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