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

Liang Jun Yin, Wei Wei Ji, Shi Yu Liu, Wei Dong He, Lin Zhao, Xin Xu, Andrea Fabre, Benjamin Dierre, Ming Hsien Lee, J. Ruud Van Ommen, Hubertus T. Hintzen

Research output: Contribution to journalArticleScientificpeer-review

27 Citations (Scopus)
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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.

Original languageEnglish
Pages (from-to)481-488
JournalJournal of Alloys and Compounds
Volume682
DOIs
Publication statusPublished - 3 May 2016

Keywords

  • (Ba, Sr)SiON: Eu
  • Blueshift
  • Local structure disordering
  • Phosphor
  • Second-sphere shrinkage

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