caa a22 4500 445369922 CHVBK 20180317142943.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s00340-011-4451-1 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4451-1 Frequency upconversion properties of Ag: TeO2-ZnO nanocomposites codoped with Yb3+ and Tm3+ ions [Elektronische Daten] [L. Kassab, L. Freitas, T. Assumpção, D. da Silva, C. de Araújo] Yb3+-Tm3+ codoped tellurite glasses containing silver nanoparticles (NPs) were synthesized and characterized using transmission electron microscopy and optical techniques. The samples' composition and the nucleation of NPs were investigated using electron diffraction and energy dispersive spectroscopy. For the optical experiments, the samples were excited using a diode laser operating at 980nm, in resonance with the Yb3+ transition 2F7/2→2F5/2. Photoluminescence (PL) bands corresponding to Tm3+ transitions were observed at 480, 650, and 800nm due to the Yb3+→ Tm3+ energy transfer. PL enhancement was achieved by heat-treatment of the samples at 325°C during different time intervals. The growth of the PL bands correlates with the increase of the silver NPs concentration. The relevant mechanisms contributing for the PL characteristics are discussed. Springer-Verlag, 2011 Kassab L. Laboratório de Vidros e Datação, Faculdade de Tecnologia de São Paulo (FATEC-SP), 01124-060, São Paulo, SP, Brazil aut Freitas L. Laboratório de Vidros e Datação, Faculdade de Tecnologia de São Paulo (FATEC-SP), 01124-060, São Paulo, SP, Brazil aut Assumpção T. Departamento de Engenharia de Sistemas Eletrônicos, Escola Politécnica da USP, 05508-900, São Paulo, SP, Brazil aut da Silva D. Departamento de Engenharia de Sistemas Eletrônicos, Escola Politécnica da USP, 05508-900, São Paulo, SP, Brazil aut de Araújo C. Departamento de Física, Universidade Federal de Pernambuco, 50670-901, Recife, PE, Brazil aut Applied Physics B Springer-Verlag 104/4(2011-09-01), 1029-1034 0946-2171 104:4<1029 2011 104 340 https://doi.org/10.1007/s00340-011-4451-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4451-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kassab L. Laboratório de Vidros e Datação, Faculdade de Tecnologia de São Paulo (FATEC-SP), 01124-060, São Paulo, SP, Brazil aut NATIONALLICENCE 700 1- Freitas L. Laboratório de Vidros e Datação, Faculdade de Tecnologia de São Paulo (FATEC-SP), 01124-060, São Paulo, SP, Brazil aut NATIONALLICENCE 700 1- Assumpção T. Departamento de Engenharia de Sistemas Eletrônicos, Escola Politécnica da USP, 05508-900, São Paulo, SP, Brazil aut NATIONALLICENCE 700 1- da Silva D. Departamento de Engenharia de Sistemas Eletrônicos, Escola Politécnica da USP, 05508-900, São Paulo, SP, Brazil aut NATIONALLICENCE 700 1- de Araújo C. Departamento de Física, Universidade Federal de Pernambuco, 50670-901, Recife, PE, Brazil aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 104/4(2011-09-01), 1029-1034 0946-2171 104:4<1029 2011 104 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer