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(Color online) Temperature-dependent PL spectra from the front surface of the ZnO epilayer taken from to (a) and (b) .
Temperature-dependent CL spectra of the ZnO epilayer excited by electron beam with acceleration voltages of (a) and (b) .
CL spectra of the ZnO epilayer taken at (a) , (b) , and (c) , excited by an electron beam with an acceleration voltage varying from .
(Color online) Temperature-dependent PL spectra from the backside of the ZnO epilayer measured from . Above , the FX-1LO becomes dominant over FX.
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