Excition-Phonon Interaction and Potential Fluctuation Effect in PbI_<2(1-x)>Br_<2x> Mixed Crystals

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Excitonic properties of Pbl.., ..., Br... mixed crystals have been investigated with attention to both the changes of the exciton-phonon coupling strength and of themagnitude of the alloy potential fluctuation. Below ,X'= 0.2, the exciton-phonon coupling strength becomes larger as x increases and a new broad luminescence band due toa self-trapped exciton state appears above .v';0.15. Physical parameters such as theexcitation energy of the exciton and the exciton-phonon coupling strength changelinearly with x following to the virtual crystal model. Above ,X'=O.5, new reflectivitypeak and luminescence band corresponding to the "orthorhombic Pbl." areobserved in stead of those of the hexagonal Pbl.. We also observe the luminescencefrom PbI.-clusters because of the large potential fluctuation effect.
社団法人日本物理学会の論文
1991-11-15