Ma, H.L.

Yue, Yuanzheng

Zhang, X.H.

Zhang, Y.F.

Zhu, C.F.

    Aalborg UniversitetCe-, Tb-, and Sm-Doped Luminescent Glasses for White Light Emitting DiodesZhu, C.F.; Zhang, X.H.; Zhang, Y.F.; Ma, H.L.; Yue, YuanzhengPublication date:2015Document VersionPublisher's PDF, also known as Version of recordLink to publication from Aalborg UniversityCitation for published version (APA):Zhu, C. F., Zhang, X. H., Zhang, Y. F., Ma, H. L., & Yue, Y. (2015). Ce-, Tb-, and Sm-Doped LuminescentGlasses for White Light Emitting Diodes. Abstract from ICG Annual Meeting, Bangkok, Thailand.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            ? Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            ? You may not further distribute the material or use it for any profit-making activity or commercial gain            ? You may freely distribute the URL identifying the publication in the public portal ?Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: April 30, 2017Ce-, Tb-, and Sm-Doped Luminescent Glasses for White Light Emitting Diodes  Chaofeng Zhua,b, Xianghua Zhangb, Yanfei Zhanga, Hongli Mab, Yuanzheng Yuea,c   aKey Laboratory of Processing and Testing Technology of Glass & Functional Ceramics of Shandong Province, Qilu University of Technology, Jinan, 250353, P.R. China bLaboratoire des Verres et Céramiques, UMR-CNRS 6226, Université de Rennes 1, Rennes, 35042, France cSection of Chemistry, Aalborg University, Aalborg, DK-9220, Denmark  Keywords: Luminescent glass; Energy transfer; LED  In recent years, phosphor-converted white light emitting diodes (W-LEDs) have attracted much attention because they are considered as an advanced lighting technology compared to conventional incandescent and fluorescent lamps for future general lighting. Luminescent glasses could be an alternative to phosphors for W-LEDs. In fact, compared with powder phosphors, luminescent glasses possess some advantages, such as homogeneous light emission, low fabrication cost, simple manufacturing procedure, excellent thermal resistance, and epoxy resin-free in assembly process.  In this presentation we report our recent findings about the Ce-, Tb-, and Sm-doped silicate glasses that can be used for W-LEDs. These glasses were prepared via the melt-quenching method, and studied in terms of absorption spectra, photoluminescence excitation and emission spectra, decay curves, Commission Internationale de L'Eclairage (CIE) color coordinates, and correlated color temperatures (CCTs). We study the effect of addition of minor components such as B2O3, Al2O3, ZnO, CaO, Na2O and CaF2 on the luminescent properties of the glasses. The results show that the emission spectra, color coordinates, and CCTs of the glasses can be tuned by varying the glass compositions and the excitation wavelengths. This gives the possibility to obtain smart lighting under the excitation of commercial wavelength-tunable UV-LEDs. In addition, energy transfer from Ce3+ to Tb3+ and Sm3+ ions occurs in Ce/Tb/Sm co-doped glasses, which was analyzed using fluorescence spectra, decay lifetimes, and energy level diagrams. Furthermore, Ce/Tb/Sm co-doped silicate glasses exhibit white light emission under ultraviolet light excitation due to the combination of violet-blue, green and orange-red light from Ce3+, Tb3+ and Sm3+ ions, respectively. The results demonstrate that the as-prepared Ce/Tb/Sm doped silicate glasses can serve as a promising candidate for developing W-LEDs.    

Ce-, Tb-, and Sm-Doped Luminescent Glasses for White Light Emitting Diodes

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Ce-, Tb-, and Sm-Doped Luminescent Glasses for White Light Emitting Diodes

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