Intriguing luminescence properties of (Ba, Sr)&lt;sub&gt;3&lt;/sub&gt;Si&lt;sub&gt;6&lt;/sub&gt;O&lt;sub&gt;9&lt;/sub&gt;N&lt;sub&gt;4&lt;/sub&gt;: Eu&lt;sup&gt;2+&lt;/sup&gt; phosphors via modifying synthesis method and cation substitution

Yin, L.J.; Ji, Wei Wei; Liu, Shi Yu; He, Wei Dong; Zhao, Lin; Xu, Xin; Fabre, A.; Dierre, B.F.P.R.; Lee, Ming Hsien; van Ommen, J.R.; Hintzen, H.T.J.M.

doi:10.1016/j.jallcom.2016.05.009

Intriguing luminescence properties of (Ba, Sr)₃Si₆O₉N₄

Title

Intriguing luminescence properties of (Ba, Sr)₃Si₆O₉N₄: Eu²⁺ phosphors via modifying synthesis method and cation substitution

Author

Yin, L.J. (TU Delft ChemE/Product and Process Engineering; University of Electronic Science and Technology of China)
Ji, Wei Wei (University of Science and Technology of China)
Liu, Shi Yu (University of Electronic Science and Technology of China)
He, Wei Dong (University of Electronic Science and Technology of China)
Zhao, Lin (University of Electronic Science and Technology of China)
Xu, Xin (University of Science and Technology of China)
Fabre, A. (TU Delft ChemE/Product and Process Engineering)
Dierre, B.F.P.R. (TU Delft RST/Fundamental Aspects of Materials and Energy)
Lee, Ming Hsien (Tamkang University)
van Ommen, J.R. (TU Delft ChemE/Product and Process Engineering)
Hintzen, H.T.J.M. (TU Delft RST/Fundamental Aspects of Materials and Energy)

Date

2016-05-03

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.