In this paper, the optical properties of Dy3 ions in alumino telluroborate glasses have studied using Judd-Ofelt (JO) theory [11, 12] and the CIE 1931 chromaticity diagram. The results have shown that alumino borotellurite glasses doped with Dy3 ions are promising for optical applications and white light emission. | VNU Journal of Science Mathematics Physics Vol. 35 No. 4 2019 52-58 Original Article Optical Properties and White Light Emission of Dy3 Doped Alumino Boro-tellurite Glasses Phan Van Do Thuy Loi University 175 Tay Son Dong Da Hanoi Vietnam Received 05 June 2019 Revised 02 July 2019 Accepted 02 July 2019 Abstract Dy3 doped alumino boro-tellurite ABT glasses xB2O3 80-x TeO2 10Al2O3 10CaO where x 35 45 and 55 have been prepared by melting method. Their optical properties were studied through absorption luminescence spectra and decay time measurements. Judd-Ofelt JO intensity parameters Ωλ λ 2 4 and 6 were determined using absorption spectra and were used to calculate the radiative parameters like transition probability stimulated emission cross-section branching ratios gain band width and optical gain for the 4F9 2 6H13 2 transition in Dy3 ions. The chromaticity coordinates were used to estimate the emission feature of prepared glasses. Keywords Alumino boro-tellurite Judd-Ofelt theory. I. Introduction Recently white light emitting diodes W-LEDs are becoming as an interesting topic for scientists to study novel white light sources for its wide application purpose in lighting technology. Consequently a lot of importance is given for generation of white light in the different glasses and crystals by incorporating rare earth ions and transition metal ions 1 2 . Among various rare earth RE ions Dy3 ion has attracted considerable and increased attention because it can alone emit near- white luminescence 2-4 . Dy3 ions-doped crystals and glasses have been extensively studied due to its primary intense blue 484 nm 4F9 2 6H15 2 and yellow 575 nm 4F9 2 6H13 2 emissions and an appropriate combination of these blue and yellow luminescence bands leads to generation of white light in the matrix 3-7 . These Dy3 -doped solid state systems can be quite easily excited by the ____ Corresponding author. Email address phanvando@ https 2588-1124 .
