Exciton Dynamics and Host Sensitized Energy Transfer in Inorganic Crystals.
Final rept. 15 Sep 72-15 Sep 74,
OKLAHOMA STATE UNIV STILLWATER DEPT OF PHYSICS
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The physical characteristics of host sensitized energy transfer in single crystals of CaWO4Sm3 and YVO4Eu3 are elucidated and interpreted in this project. This was accomplished through an extensive investigation of the optical properties of these systems over a wide range of temperatures and activator concentrations. The absorption, fluorescence, and excitation spectra were measured as well as the integrated fluorescence intensities and decay times. From experimental results which were obtained, it was possible to develop models which explain both qualitatively and quantitatively the observed spectral characteristics of these systems and how they change with temperature and activator concentration. Activator induced host traps are found to be important for both systems and intrinsic host traps are also important in the model for calcium tungstate luminescence.
- Solid State Physics