Dy3+-doped Ba-Na-B white light-emitting glass for w-LED applications

Abstract The Dy 3+ -doped barium sodium borate glasses with chemical composition 10BaO:25Na 2 O:(65-x)B 2 O 3 :xDy 2 O 3 (where x = 0.50, 0.70, 1.00 and 1.50 mol%) were prepared by melt-quenching technique. The luminescence properties of the glass samples were studied to evaluate their potential for using as luminescence materials of w-LEDs applications. The density, molar volume and refractive index of the glass samples were carried out. The absorption spectra were investigated for UV-Vis and NIR regions in wavelength range 300 to 1900 nm. The excitation spectra measured under 575 nm emission wavelength showed peaks assigned by 6 H 15/2 → 4 M 17/2 (324 nm), 4 I 9/2 (336 nm), 6 P 7/2 (349 nm), 6 P 5/2 (363 nm), 4 K 17/2 (386 nm), 4 G 11/2 (424 nm), 4 I 15/2 (453 nm) and 4 F 9/2 (471 nm), the highest excitation peak centered at 349 nm. The emission spectra, excited with 349 nm excitation wavelength, showed the two major peaks assigned by 4 F 9/2 → 6 H 15/2 (482 nm, blue light emission) and 6 H 13/2 (575 nm, yellow light emission). The experimental lifetime were found to be 0.581, 0.441, 0.362 and 0.261 ms for 0.50, 0.70, 1.00 and 1.50 mol% of Dy 2 O 3 doped in glasses, respectively. The color coordinates of all glass samples were found to be the same point at (0.38, 0.41) in the CIE 1931 chromaticity diagram and the CCT values of all glass samples were corresponding to the commercial cool white light (3100-4500K).