Low efficiency droop of InGaN/GaN blue LEDs with super-lattice active structure

Shih Pang Chang*, Kuok Pan Sou, Jet Rung Chang, Yuh Jen Cheng, Yuh Jing Li, Yi Chen Chen, Hao-Chung Kuo, Ta Cheng Hsu, Chun Yen Chang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report the efficiency droop behaviors of InGaN/GaN blue LEDs with different thickness of GaN quantum barriers (QBs). The droop percentage from efficiency peak to 70 A/cm 2 is only about 10% as reducing the thickness of GaN QBs from 104 Å to 33 Å. A less carrier localization has been observed from wavelength dependent time resoled photoluminescence measurement as reducing the thickness of GaN QBs. The alleviation of droop percentage may due to more uniform distribution of electron and hole carrier in the active region, which resulted from super-lattice (SL) like active structure. The crystalline quality does not become worse from the results of v-pits density even thickness of GaN QBs is as low as 33 Å. The SL like active structure could be a potential structure to alleviate the efficiency droop for the application of solid state general lighting.

Original languageEnglish
Title of host publicationLight-Emitting Diodes
Subtitle of host publicationMaterials, Devices, and Applications for Solid State Lighting XVI
DOIs
StatePublished - 5 Mar 2012
EventLight-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI - San Francisco, CA, United States
Duration: 24 Jan 201226 Jan 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8278
ISSN (Print)0277-786X

Conference

ConferenceLight-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI
CountryUnited States
CitySan Francisco, CA
Period24/01/1226/01/12

Keywords

  • efficiency droop
  • LEDs
  • super-lattice

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    Chang, S. P., Sou, K. P., Chang, J. R., Cheng, Y. J., Li, Y. J., Chen, Y. C., Kuo, H-C., Hsu, T. C., & Chang, C. Y. (2012). Low efficiency droop of InGaN/GaN blue LEDs with super-lattice active structure. In Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI [82781A] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8278). https://doi.org/10.1117/12.908121