Tunable dual-mode photoluminescence from nanocrystalline Eu-doped Li2ZnSiO4 glass ceramic phosphors

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Gao G, Reibstein S, Peng M, Wondraczek L
Zeitschrift: Journal of Materials Chemistry
Jahr der Veröffentlichung: 2011
Band: 21
Heftnummer: 9
ISSN: 0959-9428


Abstract

We report on tunable photoluminescence from mixed-valence Eu-doped nanocrystalline Li$_2$ZnSiO$_4$ glass ceramics. After preparation of the precursor glass in air, gradual reduction of Eu$^3$+ to Eu2+ occurs intrinsically during thermal annealing and precipitation of crystalline Li$_2$ZnSiO$_4$. Dual-mode photoemission can be generated for exciting at a wavelength of about 360 nm. The resulting colour of luminescence, ranging from orange/red to blue, can be controlled by adjusting the annealing temperature and, hence, the degree of crystallization: with increasing annealing temperature, the ratio of luminescence intensities related to Eu3+ and Eu2+ species, respectively, varies as a result of increasing degree of Eu3+-reduction as well as distinct changes in the optical scattering behaviour of the obtained glass ceramic. At the same time, the bandwidth of Eu2+-related photoemission increases from 87 to 154 nm. The underlying mechanisms of photoemission and energy transfer from Eu2+ to Eu3+ are discussed on the basis of dynamic emission spectroscopy and structural considerations, and a description of the internal reduction process is given.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Gao, Guojun
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
Wondraczek, Lothar Prof. Dr.-Ing.
Professur für Werkstoffwissenschaften (Glas und Keramik)


Zusätzliche Organisationseinheit(en)
Exzellenz-Cluster Engineering of Advanced Materials


Forschungsbereiche

C Photonic and Optical Materials
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

APA:
Gao, G., Reibstein, S., Peng, M., & Wondraczek, L. (2011). Tunable dual-mode photoluminescence from nanocrystalline Eu-doped Li2ZnSiO4 glass ceramic phosphors. Journal of Materials Chemistry, 21(9). https://dx.doi.org/10.1039/c0jm03273e

MLA:
Gao, Guojun, et al. "Tunable dual-mode photoluminescence from nanocrystalline Eu-doped Li2ZnSiO4 glass ceramic phosphors." Journal of Materials Chemistry 21.9 (2011).

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Zuletzt aktualisiert 2019-18-03 um 12:08