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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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

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