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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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
Issue number17
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 2010 Elsevier B.V., All rights reserved.


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