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Proceedings Paper

A new I-V model for light emitting devices with a quantum well
Author(s): Chin C. Lee; Winnie Chen; Jeong Park
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Paper Abstract

This paper reports a new model of current versus voltage for light emitting devices with a quantum well. These devices include light emitting diodes (LEDs) and laser diodes (LDs). In LED or LD operation, nearly all electrons and holes are injected into the quantum well and recombine there. As a result, the forward current consists of mainly the recombination current. This is in contrast to the popular Sah-Noyce-Shockley (SNS) diode equation where the dominating current is the diffusion current. The SNS model assumes that recombination in the depletion region is negligible under typical forward bias condition. This is opposite to what actually happens in LEDs or LDs with quantum wells. However, SNS equation has been used directly to describe LEDs and LDs with quantum wells for several decades probably because of its simplicity. Another probably reason is that there is no other I-V model available. In this study, I-V curves calculated using the new model agree well with results measured on GaN/sapphire LEDs with InGaN quantum wells. In the calculation, junction temperature Tj rather than case temperature Tc is used to achieve better agreement.

Paper Details

Date Published: 21 September 2006
PDF: 6 pages
Proc. SPIE 6355, Advanced LEDs for Solid State Lighting, 63550V (21 September 2006);
Show Author Affiliations
Chin C. Lee, Univ. of California, Irvine (United States)
Winnie Chen, Univ. of California, Irvine (United States)
Jeong Park, Univ. of California, Irvine (United States)

Published in SPIE Proceedings Vol. 6355:
Advanced LEDs for Solid State Lighting
Chang-Hee Hong; Tsunemasa Taguchi; Jung Han; Lianghui Chen, Editor(s)

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