Articulo
The luminescent quantum efficiency of Cr³⁺ ions in co-doped crystals of LiNb0<syb>3</sub> : ZnO determined by simultaneous multiple-wavelength photoacoustic and luminescence experiments
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Autor
Torchia, Gustavo Adrián
Muñoz, J. A.
Cussó Pérez, Fernando
Jaque Rechea, Francisco
Tocho, Jorge Omar
Institución
Resumen
In this paper, the luminescent quantum efficiency of Cr³⁺ ions in co-doped crystals of LiNb0<sub>3</sub>: ZnO: Cr³⁺ is determined by using a method based on simultaneous multiple-wavelength measurement of photoacoustic and luminescence signal after pulsed laser excitation. The quantum efficiency found in this lattice was (10 ±4)% . This result was compared with the value found from the study of the lifetime in terms of the temperature of the luminescent levels involved. In this last case, two non-equivalent crystal sites were found for Cr³⁺ ions, and two fluorescence quantum yields were determined. After the estimation of the concentration of each site by electron paramagnetic resonance experiments, the averaged fluorescence quantum yield value was (9 ± 2)% in agreement with the previous result. Facultad de Ciencias Exactas Centro de Investigaciones Ópticas