Intriguing luminescence properties of (Ba, Sr)3Si6O9N4
Eu2+ phosphors via modifying synthesis method and cation substitution
L.J. Yin (TU Delft - ChemE/Product and Process Engineering, University of Electronic Science and Technology of China)
Wei Wei Ji (University of Science and Technology of China)
Shi Yu Liu (University of Electronic Science and Technology of China)
Wei Dong He (University of Electronic Science and Technology of China)
Lin Zhao (University of Electronic Science and Technology of China)
Xin Xu (University of Science and Technology of China)
Andrea Fabre (TU Delft - ChemE/Product and Process Engineering)
B.F.P.R. Dierre (TU Delft - RST/Fundamental Aspects of Materials and Energy)
Ming Hsien Lee (Tamkang University)
JR Van Ommen (TU Delft - ChemE/Product and Process Engineering)
H.T.J.M. Hintzen (TU Delft - RST/Fundamental Aspects of Materials and Energy)
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Abstract
Synthesizing pure phase Ba3Si6O9N4 by the conventional solid-state reaction method is challenging because of easily formed secondary phase Ba3Si6O12N2 showing similar crystal structure. In this work, an alternative low temperature synthesis method is presented, and a series of green to blue emitting (Ba, Sr)3Si6O9N4: Eu2+ phosphors were prepared by a mechanochemical activation route. Variations in photoluminescence properties and crystal structure, as induced by the change in phosphor composition, were investigated. Under ultraviolet-light excitation, Ba3Si6O9N4: Eu2+ phosphor exhibited a strong narrow green emission at 518 nm and simultaneously a weak emission at 405 nm, which are ascribed to different Eu/Ba sites in Ba3Si6O9N4 lattice proved by Density Functional Theory (DFT) calculations. A continuous green to blue emission in (Ba, Sr)3Si6O9N4: Eu2+ phosphors could be achieved by tuning the crystal structure and local coordination environment acting on Eu2+ with Sr/Ba substitution. More Sr/Ba substitution improved thermal quenching and resulted in a different characteristic of emission peak shift upon increasing the temperature.
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