Ultraviolet stimulated emission in periodically polarity-inverted ZnO structures at room temperature

Jinsub Park, Takenari Goto, Sung Hyun Park, Jun Seok Ha, Euijoon Yoon, Takafumi Yao

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1 Scopus citations

Abstract

The photoluminescence and stimulated emission characteristics of two types of periodically polarity-inverted ZnO grating structures have been investigated in detail. Strong photoluminescence in the step regions is observed for all the samples. However, electron-hole plasma emission is observed only for one type of sample consisting of Zn-polar ZnO/CrN and O-polar ZnO/Cr2 O 3 layers. Moreover, strong stimulated emission occurs only in the Zn-polar layers. These optical phenomena have been discussed in terms of the diffusion of excitons and local crystal quality.

Original languageEnglish (US)
Article number171101
JournalApplied Physics Letters
Volume97
Issue number17
DOIs
StatePublished - Oct 25 2010

Bibliographical note

Funding Information:
This research was supported by WCU (World Class University) Program through National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (Grant No. R31-2008-000-10075-0).

Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.

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