LI Xiao-ping, CAO Pei-jiang, SU Shi-chen, JIA Fang, LIU Wen-jun, ZHU De-liang, MA Xiao-cui, LV You-ming. Investigation on Near Band Edge UV Luminescence of ZnO Thin Films[J]. Chinese Journal of Luminescence, 2012,(5): 481-485
LI Xiao-ping, CAO Pei-jiang, SU Shi-chen, JIA Fang, LIU Wen-jun, ZHU De-liang, MA Xiao-cui, LV You-ming. Investigation on Near Band Edge UV Luminescence of ZnO Thin Films[J]. Chinese Journal of Luminescence, 2012,(5): 481-485 DOI: 10.3788/fgxb20123305.0481.
Investigation on Near Band Edge UV Luminescence of ZnO Thin Films
High orientated undoped ZnO thin films were prepared on
c
-Al
2
O
3
substrates by pulsed laser deposition (PLD) method and using ZnO ceramic target as resource material. The photoluminescence (PL) origin of the ZnO thin films was discussed in detailed. PL spectrum of ZnO thin films is dominated by donor-bound exciton (D
0
X)emission at low temperatures while the free exciton transition (FX) gradually dominates the spectrum at higher temperatures. It notes that one emission band A at around 3.309 eV (
T
=10 K) can be clearly observed with increase in temperature up to room temperature. The mechanism of this emission band was investigated by the temperature dependence of PL spectra. The results can be attributed to the transition of conduction band electrons to acceptors (e
A
0
)
in which the acceptor binding energy was approximately 129 meV. However
the formation mechanism of the acceptor states need be investigated further.
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Keywords
references
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