Temperature dependent ligand to metal energy transfer rates in lanthanide complexes: theoretical modeling and the first direct experimental observation - Faustino, W. M.; Nunes, Luiz Antônio de Oliveira; Felinto, Maria Claudia França da Cunha; Brito, Hermi Felinto de; Malta, O. L. (International Conference on the Physics of Optical Materials and Devices - ICOM, 2012)