Red, green, and blue upconversion luminescence in ytterbium-sensitized praseodymium-doped lead-cadmium-germanate glass

• Autor(a) principal: Gouveia-Neto, Artur S.
• Data de Publicação: 2004
• Outros Autores: Da Costa, Ernande B., Bueno, Luciano A. [UNESP], Ribeiro, Sidney J.L. [UNESP]
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1117/12.523988; http://hdl.handle.net/11449/67827
• topic: Energy-transfer; Glass; Luminescence; Rare-earth; Upconversion; Absorption; Doping (additives); Energy transfer; Ground state; Rare earth elements; Semiconductor lasers; Ytterbium; Ground-state absorption; Lead-cadmium-germanate glass; Rare earth; Semiconducting glass

Blue, green, red, and near-infrared upconversion luminescence in the wavelength region of 480 - 740 nm in Pr3+/Yb3+-codoped lead-cadmium-germanate glass under 980 nm diode laser excitation, is presented. Upconversion emission peaks around 485, 530, 610, 645, and 725 nm which were ascribed to the 3P0 - 3HJ (J=4, 5, and 6), and 3P0 - 3FJ (J=2, and 3,4), transitions, respectively, were observed. The population of the praseodymium upper 3P0 emitting level was accomplished through a combination of ground-state absorption of Yb3+ ions at the 2F7/2, energy-transfer Yb3+(2F 5/2) Pr3+(3H4), and excited-state absorption of Pr3+ ions provoking the 1G4 - 3P0 transition. The dependence of the upconversion luminescence upon the Yb3+-concentration and diode laser power, is also examined, in order to subsidize the proposed upconversion excitation mechanism.