Intense white light luminescent Dy3+ doped lithium borate glasses for W-LED: A correlation between physical, thermal, structural and optical properties

In this article the physical, thermal structural and optical properties of Dy3+ doped lithium borate glasses have been studied for white LED application. The emission spectra shows two intense emission bands at around 483 nm and 574 nm corresponds to the F-4(9/2) -> H-6(15/2) and F-4(9/2) -> H-6(13/2) transitions along with one feeble band at 663 nm corresponds to F-4(9/2) -> H-6(11/2) transition. The average lifetime of Dy3+ were found to be about 2.95 and 4.94 ns for blue and yellow emission bands respectively. CIE chromaticity diagram shows glass LBD-4 containing 0.5 mol% Dy2O3 with colour co-ordinates x = 0.33 and y = 037 have highest emission intensity. These glasses having emission in the white region and thus can be used for bright white LED's and modern white LED bulbs. (C) 2016 Elsevier Masson SAS. All rights reserved.