Luminescence Study of Sm³⁺-Doped Ba-Na-B Oxide and Oxyfluoride Glasses for Orange LED

Abstract

In this research, the samarium doped barium sodium borate oxide and oxyfluoride glasses were prepared by melt-quenching technique. The density, molar volume, refractive index, absorption spectra, photoluminescence spectra (excitation spectra, emission spectra) and luminescence decay time of the glass samples were investigated. The absorption spectra, studied in the UV-Vis-NIR region, show the highest peak centered at 400 nm (⁶H_5/2→⁶P_3/2) in UV-Vis region and at 1227 nm (⁶H_5/2→⁶F_7/2) in NIR region. The emission spectra, excited by 400 nm excitation wavelength, show the emission peak centered at 562 nm (⁴G_5/2→⁶H_5/2), 600 nm (⁴G_5/2→⁶H_7/2), 646 nm (⁴G_5/2→⁶H_9/2) and 706 nm (⁴G_5/2→⁶H_11/2). The highest emission peak is the peak centered at 600 nm, corresponding to the ⁴G_5/2→⁶H_7/2 transition. The result show that the emission intensity of the oxyfluoride glass sample is higher than the oxide glass sample because the oxyfluoride glass owns less non-radiative transitions than the oxide glass.

Keywords:

• borate glass
• samarium
• oxyfluoride glass
• photoluminescence

Acknowledgments

The authors would like to thanks Suan Sunandha Rajabhat University (SSRU) and Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University (NPRU) for supporting this research. Thanks are also due to Prof. C.K. Jayasankar, Sri Venkateswara University, India, for J-O analysis software.