Details

Autor(en) / Beteiligte

• del-Castillo, J
• Yanes, A. C

Titel

Intense UV and visible up-conversion emissions from RE-doped SiO2-BaGdF5 nano-glass-ceramics

Ist Teil von

• Physical chemistry chemical physics : PCCP, 2018-08, Vol.2 (32), p.291-2918

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• RE-doped (Yb 3+ , Er 3+ and Tm 3+ ) nano-glass-ceramics (nGCs) comprising BaGdF 5 nanocrystals have been developed under thermal treatment of precursor sol-gel glasses. Structural analysis by means of X-ray diffraction patterns, high-resolution transmission electron microscopy images, and energy dispersive X-ray spectroscopy measurements, confirmed the precipitation and distribution of cubic BaGdF 5 nanocrystals (around 10 nm in size) in the silica glass matrix. Under near-IR excitation at 980 nm, up-conversion (UC) emissions have been studied as a function of selected dopants, the doping level and the pump power. In addition to the characteristic NIR, vis and UV UC emissions of Er 3+ and Tm 3+ dopant ions, the studied nGCs present intense UV UC emissions of the host fluoride nanocrystal, Gd 3+ . It was also observed that the relative Yb 3+ content tended to improve the UC emission intensities. Corresponding UC mechanisms and energy transfer processes were analysed in terms of their energy level diagrams and confirmed by transient emission and pump power measurements. Moreover, power dependence analysis revealed that these emissions present saturation effects with the increase of Yb 3+ content, even at low pump power. Results suggest that these high-efficiency UC nGCs have potential applications in UV solid state laser materials, solid state lighting and photovoltaics. High-efficient UV and VIS up-conversion RE-doped nano-glass-ceramics comprising BaGdF 5 nanocrystals, have been developed under thermal treatment of precursor sol-gel glasses.