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Low temperature photoluminescence study of polycrystalline ZnO

We report on low temperature photoluminescence study of ZnO. The photoluminescence profile at 6K reveals FXA n=1, FXn=2A and FXn=1B peaks at 367.04 nm, 363.17 nm and 365.66 nm respectively together with neutral donor bound exciton D0 1XA at 370.48 nm. The first, second, and third order longitudinal optical phonon replica of free exciton transitions FXn=1A at 375.03, 383.10, and 391.54 nm respectively, and donor acceptor pair transition at 386.73 nm is observed. The dynamics of D0 1XA and 1LO with excitation intensity is presented. A red shift of photoluminescence peak position of D0 1XA and blue shift of 1LO with increase of pump intensity is observed. The peak photoluminescence intensity of D0 1XA increases superlinearly with increase of pump intensity.

preprint2012arXivOpen access
Sanjiv Kumar Tiwari
cond-mat.mtrl-sci
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Sanjiv Kumar Tiwari

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