White emission from Dy3+ doped borate glass and their Judd-Ofelt analysis

The high energy consumption and short lifetimes in the descendant and fluorescence lamps encourage to develop another lighting source which has high efficiency, long lifetimes and environmentally friendly. The material which has that advantages is the rare earth doped glasses. This paper explained Dy3 doped borate oxide glass which has been fabricated by melt and quenching method. The glass sample was melted at 11000 C for 3 hours and annealed at 500 C for 3 hours. Density and molar volume of glass sample increase by increasing 0.5 to 2.5 mol% Dy203. The glass sample quenched at 0.5 mol% Dy203. The XRD pattern confirmed the amorphous of prepared glass. The highest peak of absorption spectra occurs due to 6F9/2.6Fiii2 transition centered at 1266 nm. The Judd-Ofelt parameters (Ch=2,4,6 x 10-20 cm2) of glass sample were 10.69, 4.81 and 5.17 respectively. The developed glass sample had the highest emission intensity (A,,, = 350 nm) and radiative properties in 4F912.6H15/2 and 4F9/2 -6F133/2 transition centered at 482 nm (blue) and 575 tun (yellow) respectively. The combination of blue and yellow light produced white emission. It was proven by the CIE chromaticity that showed the white emission region (x=0.37 and y=0.40). From all results, the glass sample was the suitable candidate for white emission light application.