Advantages of blue LEDs with graded-composition AlGaN/GaN superlattice EBL

Bing Cheng Lin, Kuo Ju Chen, Hau Vei Han, Yu-Pin Lan, Ching Hsueh Chiu, Chien-Chung Lin, Min Hsiung Shih, Po-Tsung Lee, Hao-Chung Kuo

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

InGaN/GaN light-emitting diodes (LEDs) with graded-composition AlGaN/GaN superlattice (SL) electron blocking layer (EBL) were designed and grown by metal-organic chemical vapor deposition. The simulation results demonstrated that the LED with a graded-composition AlGaN/GaN SL EBL have superior hole injection efficiency and lower electron leakage over the LED with a conventional AlGaN EBL or normal AlGaN/GaN SL EBL. Therefore, the efficiency droop can be alleviated to be ~20%from maximum at an injection current of 15-120 mA, which is smaller than that for conventional AlGaN EBL (30%). The corresponding experimental results also confirm that the use of a graded-composition AlGaN/GaN SL EBL can markedly enhance the light output power by 60%.

Original languageEnglish
Article number6589944
Pages (from-to)2062-2065
Number of pages4
JournalIEEE Photonics Technology Letters
Volume25
Issue number21
DOIs
StatePublished - 21 Oct 2013

Keywords

  • Light-emitting diodes (LEDs)
  • quantum well (QWs)
  • superlattice (SL)

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