SIMULTANEOUS MEASUREMENT OF PHOTOACOUSTIC AND EXCITATION-SPECTRA FOR THE EVALUATION OF QUANTUM EFFICIENCIES OF URANIUM-MICA TYPE COMPOUNDS

A new method of estimating the absolute quantum efficiency of a phosphor material based on the simultaneous measurement of photoacoustic and fluorescent excitation spectra is presented. The method is distinguishable from previous methods in that a reference material is not required. The method has been successfully applied to uranium-mica compounds. The transition rate constants for the radiative and non-radiative processes are obtained on the basis of the quantum efficiency and fluorescence life time data.