Intermolecular energy transfer and photostability of luminescence-tuneable multicolour PMMA films doped with lanthanide-'beta'-diketonate complexes - Kai, Jiang; Felinto, Maria Claudia França da Cunha; Nunes, Luiz Antônio de Oliveira; Malta, Oscar L; Brito, Hermi Felinto de (Journal of Materials Chemistry, 2011)