Relaxation dynamics of processes in colloidal zirconia nanosols. Dependence on excitation energy and temperature

This Letter addresses process relaxation dynamics occurring in colloidal zirconia (ZrO2) nanosols under steady-state and pulsed laser excitation; the temperature dependence of the photoluminescence is also reported. The laser-induced emission emanating from these nanosols is thermally quenched with activation energy Etq=0.048±0.008 eV, identical to the activation energy (Etq=0.050±0.005 eV) of thermal quenching of the photoluminescence under steady-state excitation. It is also identical to the energy (Eads=0.046±0.005 eV) of thermal quenching of the photostimulated adsorption of oxygen on ZrO2 micron-size particles. A pathway to summarize the events is proposed.