White light generation controlled by changing the concentration of silver nanoparticles hosted by Ho³⁺/Tm³⁺/Yb³⁺ doped GeO<inf>2</inf>-PbO glasses

• Autor(a) principal: Camilo, Mauricio E. [UNESP]
• Data de Publicação: 2015
• Outros Autores: Silva, Elton De O. [UNESP], Kassab, Luciana R.P. [UNESP], Garcia, José A.M. [UNESP], De Araújo, Cid B.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.jallcom.2015.04.108; http://hdl.handle.net/11449/167819
• topic: Energy transfer; Frequency upconversion; Germanate glass; Rare-earth ions; Silver nanoparticles; White light generation

Frequency upconversion (UC) experiments were performed with GeO<inf>2</inf>-PbO glasses, containing silver nanoparticles (NPs), doped with holmium (Ho³⁺), thulium (Tm³⁺) and ytterbium (Yb³⁺) ions. The samples were excited using a continuous-wave diode laser operating at 980 nm. The UC intensities and the colors of the samples were controlled by changing the concentrations of the rare-earth ions (REI) and the silver NPs nucleated inside the samples. The colors observed spanned the visible range from the red-yellow to the blue. For a particular combination of silver NPs and REI concentrations it was obtained white light generation corresponding to the CIE coordinates X = 0.33 and Y = 0.33.