Nature of room-temperature photoluminescence in ZnO

The temperature dependence of the photoluminescence (PL) transitions associated with various excitons and their phonon replicas in high-purity bulk ZnO has been studied at temperatures from 12 K to above room temperature (320 K). Several strong PL emission lines associated with LO phonon replicas of...

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Bibliographic Details
Published in:Applied physics letters 2004-11, Vol.86
Main Authors: Shan, W., Walukiewicz, W., Ager III, J.W., Yu, K.M., Yuan, H.B., Xin, H.P., Cantwell, G., Song, J.J.
Format: Article
Language:English
Subjects:
EXCITONS
MATERIALS SCIENCE
PHONONS
PHOTOLUMINESCENCE
REFLECTION
REPLICAS
TEMPERATURE DEPENDENCE
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Summary:The temperature dependence of the photoluminescence (PL) transitions associated with various excitons and their phonon replicas in high-purity bulk ZnO has been studied at temperatures from 12 K to above room temperature (320 K). Several strong PL emission lines associated with LO phonon replicas of free and bound excitons are clearly observed. The room temperature PL spectrum is dominated by the phonon replicas of the free exciton transition with the maximum at the first LO phonon replica. The results explain the discrepancy between the transition energy of free exciton determined by reflection measurement and the peak position obtained by the PL measurement.
ISSN:0003-6951
1077-3118