Effect of phase transition on photoluminescence of Er-doped KNN ceramics

Xiao Wu, Chi Man Lau, Kin Wing Kwok

Research output: Journal article publicationJournal articleAcademic researchpeer-review

27 Citations (Scopus)


The lead-free ceramics K0.5Na0.5NbO3doped with x mol% Er3+ions have been successfully manufactured and their photoluminescence properties, including the up-conversion visible (480-700 nm) emissions, down-conversion near infrared (1400-1680 nm) and middle infrared (2620-2850 nm) emissions, emission colors and lifetimes of the energy levels have been systemically investigated. The corresponding photoluminescence mechanism has been discussed in detail. Our results show that the Er-doping induces a phase transition from orthorhombic to cubic-like as well as inhibits the grain growth due to the donor-type nature. Both the change of crystallographic structures and concentration-quenching effect induced by Er3+ions have great influences on the photoluminescence properties. Because of the wide emission ranges and long lifetimes, Er-doped K0.5Na0.5NbO3ceramics are the promising candidates for optoelectronic applications.
Original languageEnglish
Pages (from-to)343-350
Number of pages8
JournalJournal of Luminescence
Publication statusPublished - 1 Jan 2014


  • Energy transfer
  • Er-doped KNN ceramics
  • Lifetime
  • Phase transition
  • Up-conversion photoluminescence

ASJC Scopus subject areas

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Biochemistry
  • Condensed Matter Physics


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