Spectroscopy Characterization of MWCNT Doped B₂O₃-Gd₂O₃-ZnO-Er₂O₃ Glass for NIR Solid State Application

Abstract

In this work, multi wall carbon nanotube (MWCNT) doped borate glass has been successfully developed by melt quenching technique with the chemical composition 67.5B₂O₃-20ZnO-12Gd₂O₃-Er₂O₃-0.5MWCNT. Several peaks observed from absorption spectra due to transition from ⁴I_15/2 as a ground state into several states i.e. ⁴G_11/2, ²G_9/2, ⁴F_7/2, ⁴F_5/2, ²H_11/2,⁴S_3/2, ⁴F_9/2, ⁴I_11/2, and ⁴I_13/2. The sample shows a strong emission in 1536 nm because of ⁴I_13/2→⁴I_15/2 transition under 520 nm wavelength excitation. Emission around 402 nm and 471 nm under 270 nm excitation could be the indication for presence of MWCNT. The sample exhibits NIR to NIR up-conversion under 1500 nm excitation. Absorption data have been used to calculate optical band gap energy through Tauc plot method. This study shows that MWCNT doped borate glass could be a promising material for solid state application in NIR region.

Keywords:

• Borate glass
• luminescence
• MWCNT
• erbium
• NIR to NIR up-conversion
• Tauc plot

Additional information

Funding

The author would like to thank National Research Council of Thailand (NRCT) for partially support and Research of P3MI ITB (91i/I1.C01/PL/2019) for financial support.