Novel layered perovskite Sr3Ti2O7:Eu3+ phosphor with high-efficiency luminescence enhanced by charge compensation

Le Zhang, Bingheng Sun, Quan Liu, Nan Ding, Hao Yang, Lixi Wang, Qitu Zhang

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

A novel Sr3Ti2O7:Eu3+ red phosphor with double-layered perovskite structure was successfully synthesized by solid-state reaction method using Li+ ions as charge compensators. Its crystal structure, morphology and photoluminescence under different calcination temperatures and different compensation styles of Li+ were investigated. The phosphor could obtain pure tetragonal perovskite phase with I4/mmm space group at 1300 °C. Non-stoichiometric (NSC) compensation could keep more Sr2+ ions to hold the perovskite structure stable for higher doping concentration of Eu3+. The emission was dominated by the electric-dipole transition with obvious peak splitting due to two different doping sites with lower symmetry of Sr2+. Layered structure provided bigger space to hold more Li+ ions and NSC style had bigger advantage on the luminescence enhancement for higher doping concentration. Better excitation matches, higher quantum yield (25.1%, λex = 395 nm) and better color rendering properties provided a potential red material for white LEDs.

Original languageEnglish
Pages (from-to)27-31
Number of pages5
JournalJournal of Alloys and Compounds
Volume657
DOIs
StatePublished - 5 Feb 2016

Keywords

  • Layered perovskite
  • Luminescence
  • Optical materials
  • Phosphors

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