Journal
JOURNAL OF APPLIED PHYSICS
Volume 102, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2820100
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The coupling between exciton and longitudinal optical (LO) phonon was investigated in the use of temperature-dependent photoluminescence from MgxZn1-xO powders prepared by a sol-gel method in the range of 0 <= x <= 0.05. The exciton binding energy increases to 73 meV for 5 at. % Mg incorporated powders. The strength of exciton-LO phonon coupling was deduced from the energy shift of exciton emission with temperature variation. The increase of the exciton binding energy results from a decrease of the exciton Bohr radius that is responsible for reducing the coupling strength of exciton-LO phonon as increasing Mg content. (c) 2007 American Institute of Physics.
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