Dy3+-doped glasses with various compositions (30+x)B2O3+ (60-x)TeO2 + 9Na2O + 1Dy2O3 (x = 10 and 20) were prepared by a melt–quenching technique. The specifically structural properties of boro-tellurite glasses with the high borate content (> 30 mol%) was reflected in the unusually large values of the Judd-Ofelt parameters Ω2 and Ω6 . The CIE chromaticity color coordinates were calculated from the luminescence spectra of Dy3+ ions of the glasses with the different compositions and all of them were located in the white light zone of the color coordination diagram. | VNU Journal of Science: Mathematics – Physics, Vol. 32, No. 2 (2016) 1-7 Optical Properties of Dy3+ Doped Boro-tellurite Glasses Vu Phi Tuyen* Graduate University of Science and Technology, VAST, 18 Hoang Quoc Viet, Hanoi, Vietnam Received 04 April 2016 Revised 16 May 2016; Accepted 20 June 2016 Abstract: Dy3+-doped glasses with various compositions (30+x)B2O3+ (60-x)TeO2 + 9Na2O + 1Dy2O3 (x = 10 and 20) were prepared by a melt–quenching technique. The specifically structural properties of boro-tellurite glasses with the high borate content (> 30 mol%) was reflected in the unusually large values of the Judd-Ofelt parameters Ω2 and Ω6 . The CIE chromaticity color coordinates were calculated from the luminescence spectra of Dy3+ ions of the glasses with the different compositions and all of them were located in the white light zone of the color coordination diagram. Keywords: Boro-tellurite, Dy3+, white light. 1. Introduction∗ Nowadays, white light emitting diodes (W-LEDs) are becoming an interesting topic for scientists with the goal of finding novel white light sources for its wide application purpose in lighting technology. Among various rare earth (RE) ions, Dy3+ ion has attracted considerable and increased attention because it can alone emit near-white luminescence. Dy3+ions-doped crystals [1,2] and glasses [3,4] 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. The main objectives of the present study are following: 1. To study the relation between the structure and optical properties of the Dy3+ doped borotellurite glasses with the emphasis on the glasses having high borate content (> 30 mol%). 2. Estimating the possibilities to use the Dy3+ doped boro-tellurite glasses as a potential material for generating white light. 2. Experimental Dy3+-doped .
