QUANTUM EFFICIENCY MEASUREMENT IN SOLIDS BY PHOTOACOUSTIC AND LUMINESCENCE EXPERIMENTS

In the work, a method for the determination of fluorescent quantum eff iciencies in solids is analyzed. The method is based on the simultaneo us measurement of photoacoustic and luminescent signals, after pulsed laser excitation at different wavelengths. The accuracy of the method to study vibronic bands of transition metal ions in solids is discusse d and the application to the case of Cr3+ ions in LiNbO3 and Eu2+ ions in alkali halides is presented. It is found that the method is partic ularly suitable for systems showing a high (approximately 100%) quantu m efficiency.