Title
Intense white light luminescent Dy3+ doped lithium borate glasses for W-LED: A correlation between physical, thermal, structural and optical properties
Author
Pravin P. Pawar, Sudhir R. Munishwar, Rupesh S. Gedam
Year
2017
Journal
Solid State Sciences
Abstract
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 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions along with one feeble band at 663 nm corresponds to 4F9/2 → 6H11/2 transition. The average lifetime <τ> 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 = 0.37 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.
Instrument
FP-8200
Keywords
Fluorescence, Photoluminescence, Optical properties, Solid state, Materials, LEDs