LUMINESCENCE PROPERTIES OF DY3+ IONS DOPED IN B2O3-AL2O3-CAO-NA2O GLASS FOR SOLID STATE LIGHTING APPLICATIONS

Yotsakit  Raweepuangt; Jakrapong  Kaewkhao; Rajaramakrishna  Rajanavaneethakrishna; Suchart  Kothan; Narong  Sangwaranatee

Authors

Yotsakit Raweepuangt Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom 73000, Thailand.
Jakrapong Kaewkhao Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom 73000, Thailand.
Rajaramakrishna Rajanavaneethakrishna Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom 73000, Thailand.
Suchart Kothan Center of Radiation Research and Medical Imaging, Department of Radiologic Technology, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, 50200, Thailand.
Narong Sangwaranatee Applied Physics, Faculty of Science and Technology, Suan Sunandha Rajabhat University, Bangkok 10300, Thailand.

Keywords:

Borate glasses, Dy3+ ions, lifetime, luminescenc

Abstract

In this research, the luminescence properties of borate glasses doped with Dy2O3 have been investigated. The glass samples with chemical composition of (40-x)B2O3:20Al2O3:20CaO:20Na2O: xDy2O3 (where x = 0.00, 0.05, 0.10, 0.50, 1.00, and 2.00 mol%) were prepared by the conventional melt quenching technique. The results show that the density and molar volume tend to increase with increasing of Dy2O3 concentration. The excitation spectra are observed seven bands at 325, 351, 364, 387, 425, 452, and 472 nm corresponding to the transitions from the ground state 6H5/2 to excited states 6P3/2, 6P7/2, (4I11/2+4P3/2), (4I13/2+4F7/2), 4G11/2, 4I15/2, and 4F9/2, respectively. The emission spectra were recorded using 350 nm excitation wavelength. The emission peaks are observed at 482 (4F9/2→6H15/2), 576 (4F9/2→6H13/2), and 664 (4F9/2→6H13/2) nm. The ratio of ED transition to the MD transition is a measure of symmetry orientation of the local environment around the RE ion site which is evaluated for the present work using Yellow/Blue (Y/B) intensity ratio (4F9/2→6H13/2)/ (4F9/2→6H15/2) values. The tunable white light emission at the strongest excitation wavelengths are investigated through CIE 1931 diagram and calculated the correlated colour temperature. The decay curves show the decreasing of lifetimes with addition of Dy2O3 concentration.

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