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Researchers from Nagaoka University of Technology Report on Findings in Optical Research [Eu3+ doped 1La(2)O(3):2WO(3):1B(2)O(3) glass and...

July 8, 2014



Researchers from Nagaoka University of Technology Report on Findings in Optical Research [Eu3+ doped 1La(2)O(3):2WO(3):1B(2)O(3) glass and glass-ceramic]

By a News Reporter-Staff News Editor at Journal of Technology -- Investigators discuss new findings in Optical Research. According to news reporting out of Nagaoka, Japan, by VerticalNews editors, research stated, "In WO3-La2O3-B2O3 system, glasses were obtained in the region between 20 and 30 mol% La2O3. A liquidphase separation region was observed near the WO3-B2O3 side."

Our news journalists obtained a quote from the research from the Nagaoka University of Technology, "A glass with nominal composition 50WO(3):25L(2)O(3):25B(2)O(3) doped with Eu2O3 was synthesized by melt quenching method. The obtained glass was characterized by X-ray diffraction (XRD), differential thermal analysis (DTA), UV-vis, infrared spectroscopy (IR) and photoluminescence spectroscopy (PL). According to the DTA data, Eu3+ ions decrease the glass transition temperature from 621 degrees C to 574 degrees C and crystallization temperature from 690 degrees C to 677 degrees C. Structural model for the glass network was suggested on the base of IR and UV-vis spectral investigations. It was established that WO4 and WO6 structural units (620-960 cm(-1)) and BO3 and BO4 polyhedra (1050-1380 cm(-1)) build up the glass network. During vitrification partial transformation of WO4 to WO6 and BO3 to BO4 was proved. The quenched glass is transparent in the visible region and exhibits typical absorption bands of Eu3+ ions due to the 4f transitions D-5(0)- > F-7(j) (j = 0-4). A glass-ceramic consisting of LaBWO6:Eu3+ nanocrystals with enhanced photoluminescence emissions is synthesized."

According to the news editors, the research concluded: "The intensity of emission increases drastically in the glass-crystalline sample compared with the glass and polycrystalline sample."

For more information on this research see: Eu3+ doped 1La(2)O(3):2WO(3):1B(2)O(3) glass and glass-ceramic. Optical Materials, 2014;36(8):1366-1372. Optical Materials can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Optical Materials - www.elsevier.com/wps/product/cws_home/522512)

Our news journalists report that additional information may be obtained by contacting L. Aleksandrov, Nagaoka Univ Technol, Dept. of Mat Sci & Technol, Nagaoka, Niigata 9402188, Japan. Additional authors for this research include R. Iordanova, Y. Dimitriev, N. Georgiev and T. Komatsu.

Keywords for this news article include: Asia, Japan, Nagaoka, Optical Research

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Journal of Technology


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