J. Phys. IV France
Volume 125, June 2005
Page(s) 225 - 227

J. Phys. IV France 125 (2005) 225-227

DOI: 10.1051/jp4:2005125053

Determination of fluorescence quantum efficiency in solutions by thermal lens measurements at several wavelengths: Application to Rhodamine 6G

C. Jacinto1, S.M. Lima2 and T. Catunda1

1  Universidade de São Paulo, Instituto de Física de São Carlos, CP 369, São Carlos, SP, Brazil
2  Universidade Estadual de Mato Grosso do Sul - UEMS, Grupo de Espectroscopia Óptica e Fototérmica, CP 351, Dourados, MS, Brazil

In this work the multi-wavelength thermal lens method is introduced as a valuable tool to measure the fluorescence quantum efficiency ($\eta$) of luminescent solutions. This methodology exhibits some advantages over conventional methods, like for instance no need to use a reference sample. The Rhodamine was firstly chosen for our study because its properties are very well known. Our results indicate a high $\eta$ value for Rhodamine (~ 100%).

© EDP Sciences 2005