| 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 Sm2O3 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 ï‚® 6HJ/2 (J = 5, 7, 9, 11) were
detected, which realized the red-orange emission in the host. Concentration
quenching occurred when Sm2O3 and CaF2 contents were 1.0 and 8 mol%,
respectively. Dipole-dipole interactions were the effective mechanisms of energy
transfer and quenching between Sm3+ ions. Meanwhile, with fixed Sm2O3
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 l´Eclairage (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.
[Keywords: CaF2, Sm2O3, Borosilicate glass, Luminescence enhancement, Red
emission adjustment] |
