Effect of Al2O3/Ga2O3 ratio on the structure and luminescence properties of Sm3+ doped SrO-Nb2O5-Al2O3-Ga2O3-SiO2 glasses.

[Display omitted] • A novel Sm3+ doped silica-aluminum-gallium glasses for orange-red LEDs has been prepared. • The effect of Al 2 O 3 /Ga 2 O 3 ratio on the luminescence properties of Sm3+ ions was investigated. • Compared with gallium silicate glass, the addition of Al 2 O 3 significantly improves the luminescence performance of Sm3+ ions. The Sm3+ doped SrO-Nb 2 O 5 -Al 2 O 3 -Ga 2 O 3 -SiO 2 glasses in this work were prepared using the conventional melt quenching method. The effects of Al 2 O 3 /Ga 2 O 3 ratio on the structure and orange light emission properties were studied by XRD, Raman spectroscopy, spectrophotometer and J-O theory, respectively. With the increase of Al 2 O 3 content, the absorption coefficient of the glass sample gradually increases, which might be attributed to an increase in non-bridged oxygen bonds caused by a change in the glass network structure. Under 403 nm excitation, the emission spectra show clear peaks at 602 nm and 649 nm, representing the 4G 5/2 → 6H 7/2 , and 4G 5/2 → 6H 9/2 transitions, respectively. When the Al 2 O 3 /Ga 2 O 3 ratio is 0.25, the sample luminescence intensity is the highest, and the emission cross section of A2 glass sample is 4.34 × 10−22 cm2. The CIE color coordinates, color purity, and color temperature values of all samples were determined, and they were all located in the orange-red light region. The experiments results reveal that the prepared silica-aluminum-gallium glasses has a potential application prospect in orange-red LEDs, solid state lasers and other fields. [ABSTRACT FROM AUTHOR]