Tuning multicolor emission in AgNCs/Tm3+/Mn2+-doped fluorophosphate glasses

• Autor(a) principal: Fares, Hssen [UNESP]
• Data de Publicação: 2020
• Outros Autores: Castro, Tarcio, Franco, Douglas Faza [UNESP], Fucikova, Anna, da Silva, Robson R., Valenta, Jan, Ribeiro, Sidney J.L. [UNESP], Nalin, Marcelo [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.jnoncrysol.2020.119968; http://hdl.handle.net/11449/201581
• topic: Multicomponent fluorophosphate glasses; Sensitization lanthanide and metal ions; Silver nanoclusters; Visible emission

Herein we report the synthesis of highly-doped silver nanocluster in fluorophosphate glasses through the melting-quenching method in order to achieve sensitization with Tm3+ and Mn2+ ions. Blue and red emission belonging to Tm3+ (470 to 490 nm) and Mn2+ (550 to 750 nm) ions could be obtained via non-resonant excitation of Tm3+ and Mn2+. Slight decrease of the fluorescence decay times confirmed an energy transfer as a possible mechanism to explain the Tm3+ and Mn2+ emission. The composition of 5 mol% of AgNO3, 0.4 mol% of Tm2O3 and 0.2 mol% of MnF2 in our sample leads to distance between donor (silver nanoclusters) and acceptor (Tm3+-Mn2+) as short as 11 Å, which suggests that the main mechanism for blue and red emission from Tm3+ and Mn2+ is Förster Resonance Energy Transfer (FRET). The results presented here show that the studied material has potential application for multicolor generation as luminophore in white light emitting diodes (W-LED).