Influenceof Sm₂O₃ and CaF₂ Concentrationonthe Enhancement of Luminescence and Red Colour in Borosilicate Glass

Abstract

A series of Samarium (Sm) doped borosilicate glass was designed and prepared by melt-quenching method to realize the controllable and adjustable red emission for further applications of rare-earth doped glass. The influence of Sm ₂O₃ and CaF₂ concentration on the structure, composition and luminescence property of samples were investigated and revealed. It was shown that the samples had glassy non-crystalline nature and high transparency within the visible light region. The characteristic transitions of Sm³⁺ ion assigned to ⁴G_5/2 → ⁶H_J/2 (J = 5, 7, 9, 11) were detected, which realized the red-orange emission in the host. Concentration quenching occurred when Sm₂O₃ and CaF ₂ contents were 1.0 and 8 mol%, respectively. Dipole-dipole interactions were the effective mechanisms of energy transfer and quenching between Sm ³⁺ ions. M eanwhile, with fixed Sm ₂O₃ concentration, both the PL intensity and the fluorescence lifetime increased as the CaF₂ content enhanced. In a word, the orange/red ( O/R) ratio, Commission Internationale de ĺEclairage (CIE) chromatic coordinates and luminescence colour of the samples are dependent and adjustable by the concentration of Sm₂O₃ and CaF₂, which helps to fabricate tunable efficiency light-emitting materials and extend their applications by regulating the composition of glass.

GRAPHICAL ABSTRACT

Keywords:

• CaF₂
• Sm₂O₃
• Borosilicate glass
• Luminescence enhancement
• Red emission adjustment