White Emission from Dy³⁺ Doped in ZnO – CaO – B₂O₃ for WLEDs Material Application

Abstract

The Dy³⁺ ions doped CaO-ZnO-B₂O₃ glasses were synthesis by the melt quenching technique with various Dy₂O₃ concentrations to investigation physical and optical properties. The results showed that the density and the molar volume trend to be increased along with increased Dy³⁺ concentration. The absorption spectra showed characteristic absorption peaks in the visible and near infrared regions. Judd–Ofelt (JO) intensity parameters have been obtained from the optical absorption spectra. The emission spectra of the glasses are illustrated the highest emission intensity at 574 nm wavelength, which corresponding to Dy³⁺ transition ⁴F_9/2→⁶H_13/2 level. The decay time value decreased as the concentration of Dy₂O₃ increased. The CIE 1931 chromaticity investigation showed that Dy³⁺ doped glasses emitted light with white color.

Keywords:

• Glasses
• borate glasses
• Dy³⁺
• luminescence
• optical

Acknowledgments

O. Chaemlek would like to thanks Faculty of Science, Silpakorn University for research funding support this work. Authors would like to thank National Research Council of Thailand (NRCT) and Thailand Science Research and Innovation (TSRI) for supporting this research.