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

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 4G5/2 → 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