Abstract
Cu 2 O microcrystallites of the size range 55-73 angstrom were embedded in the nano-zirconia thin film matrix if precursor contains zirconium oxychloride octahydrate and cupric nitrate trihydrate. Absorption and fluorescence spectra of the films annealed at different temperature, 200 degrees-1200 degrees C revealed that the microcrystallites are possessing both mono- and biexcitonic behaviors which are dependent on microcrystallite size. Maximum biexcitonic behavior has been predicted in the case of 450 degrees annealed sample which also showed phosphorescence possibly due to inter-crossing of potential energy curve (Gamma) 1 + of Cu 2 O exciton and 3D of free Cu + . The anisotropic nature of the excitonic transitions of Cu 2 O was also observed due to electrical quadrupole transition which was authenticated by its emission and ESR spectral studies.
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