1. Intriguing luminescence properties of (Ba, Sr)3Si6O9N4: Eu2+ phosphors via modifying synthesis method and cation substitution.
- Author
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Yin, Liang-Jun, Ji, Wei-Wei, Liu, Shi-Yu, He, Wei-Dong, Zhao, Lin, Xu, Xin, Fabre, Andrea, Dierre, Benjamin, Lee, Ming-Hsien, van Ommen, J. Ruud, and Hintzen, Hubertus T. (Bert)
- Subjects
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EUROPIUM , *SILICON compounds , *PHOSPHORS , *CHEMICAL synthesis , *LUMINESCENCE , *SUBSTITUTION reactions , *SOLID state chemistry , *CRYSTAL structure - Abstract
Synthesizing pure phase Ba 3 Si 6 O 9 N 4 by the conventional solid-state reaction method is challenging because of easily formed secondary phase Ba 3 Si 6 O 12 N 2 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) 3 Si 6 O 9 N 4 : Eu 2+ 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, Ba 3 Si 6 O 9 N 4 : Eu 2+ 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 Ba 3 Si 6 O 9 N 4 lattice proved by Density Functional Theory (DFT) calculations. A continuous green to blue emission in (Ba, Sr) 3 Si 6 O 9 N 4 : Eu 2+ phosphors could be achieved by tuning the crystal structure and local coordination environment acting on Eu 2+ 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. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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