• Ch.Vijay Anil Dai
• Ch.Srinivasu
• K.Suresh
• T.Niranjan Kumar

Abstract In this work binary glasses with the composition 40Bi2O3-(60-x)B2O3: xDy2O3 for x=0 and 0.5 mol % were prepared by the melt-quenching technique. The prepared glass samples were characterized by Photoluminescence and optical absorption spectra and were recorded at temperature. In order to confirm the amorphous nature of the glass samples, XRD analysis was done. Physical properties of the prepared glass samples were also measured and presented in this paper. From the obtained absorption edges optical band gap, the Urbach energies were calculated, the optical band gap is found to decrease with Dy2O3. The luminescence spectra exhibited blue and greenish-yellow emission bands at around 482 nm (broad with less intensity) and 562 nm (sharp with high intensity) corresponds to the 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions respectively. The emission spectrum was characterized through Commission International d'Eclairage (CIE) 1931 chromaticity diagram to explore its suitability for display applications. CIE chromaticity diagram for the prepared BiBDy0.5 glass (λex =280 nm) and the values of the (x, y) color coordinates are found to be (0.393, 0.604) with CCT 4663K. It is noted from figure that, the (x, y) color co-ordinate values are found to lie in the greenish-yellow region, which is useful for white light generation. The same prepared glass sample, BiBDy0.5 shows chromaticity co-ordinates (0.479, 0.520) with CCT 3995K which is in yellow region in the chromaticity diagram under 387nm excitation wavelength, which can be useful for display applications.

Trivalent ion, dysprosium, glass, annealing, melt-quenching, optical, luminescence

"OPTICAL AND LUMINESCENCE PROPERTIES OF Dy3+ (0.5%) DOPED BISMUTH BORATE (BiB) GLASS ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.967-972, June 2019, Available :http://www.jetir.org/papers/JETIR1906G47.pdf

"OPTICAL AND LUMINESCENCE PROPERTIES OF Dy3+ (0.5%) DOPED BISMUTH BORATE (BiB) GLASS ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp967-972, June 2019, Available at : http://www.jetir.org/papers/JETIR1906G47.pdf