Effect of Yb3+ concentration on the spectroscopic properties of Er3+/Yb3+ co-doped SiO2-TiO2 nanofiber

Abstract Er 3+ has been gaining much interest due to the multiple emissions in both infrared and visible regions. Based on the previous study, SiO 2 -TiO 2 have been proven to be an excellent host for Er 3+ . However, Er 3+ exhibits a low absorption cross-section when doped into the silica-based host. Therefore, Yb 3+ has been introduced into the matrix and acts as a sensitiser to increase the luminescence intensity. Er 3+ /Yb 3+ co-doped 75SiO 2 -25TiO 2 nanofiber with different Er 3+ /Yb 3+ ratios were fabricated via the sol-gel electrospinning method. The FESEM result shows the diameter of the nanofibers in the range of 62 to 515 nm. The absence of any peak within the 3000-4000 cm -1 range in the FTIR spectra indicates the complete removal of the OH group. The XRD results imply that all samples were amorphous. The PL spectra showed strong green emission peaks, which were ascribed to 2 H 11/2 → 4 I 1 5/ 2 as well as red emission peaks attributed to 4 F 9/2 → 4 I 15/2 Er 3+ transitions. The PL intensity was varied according to the Yb 3+ concentration. The addition of Yb 3+ was proven to aid the increment of PL intensity. Nevertheless, the PL intensity reduced when too high of Yb 3+ concentration was used due to the concentration quenching effect.