Efficiency enhancement of InGaN amber MQWs using nanopillar structures

Yiyu Ou, Daisuke Iida, Jin Liu, Kaiyu Wu, Kazuhiro Ohkawa, Anja Boisen, Paul Michael Petersen, Haiyan Ou

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We have investigated the use of nanopillar structures on high indium content InGaN amber multiple quantum well (MQW) samples to enhance the emission efficiency. A significant emission enhancement was observed which can be attributed to the enhancement of internal quantum efficiency and light extraction efficiency. The size-dependent strain relaxation effect was characterized by photoluminescence, Raman spectroscopy and time-resolved photoluminescence measurements. In addition, the light extraction efficiency of different MQW samples was studied by finite-different time-domain simulations. Compared to the as-grown sample, the nanopillar amber MQW sample with a diameter of 300 nm has demonstrated an emission enhancement by a factor of 23.8.
Original languageEnglish (US)
Pages (from-to)317-322
Number of pages6
JournalNanophotonics
Volume7
Issue number1
DOIs
StatePublished - Sep 9 2017

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