Time-resolved photoluminescence of barium titanate ultrafine powders

S. G. Lu, Z. K. Xu, Haydn Chen, Chee Leung Mak, K. H. Wong, K. F. Li, K. W. Cheah

Research output: Journal article publicationJournal articleAcademic researchpeer-review

41 Citations (Scopus)

Abstract

Time-resolved photoluminescence (PL) near 540 nm, taken from barium titanate (BaTi O3) ultrafine powders of ∼80, 90, and 110 nm in size, was measured at 11 K. Two-exponential functions were found to fit the decay curves well, and the decay lifetimes were composed of one short, about 10 ns, and one long, about 200 ns, time constants, respectively. Results also indicate that the PL peaks show a small blueshift with decreasing BaTi O3 particle size. The decay process consists of the recombination of self-trapped excitons (long lifetime decay) and of the electrons in the surface states with the holes in the valence band (short lifetime decay). The short lifetime component makes comparable contribution to the decay intensity of PL with the long lifetime one.
Original languageEnglish
Article number064103
JournalJournal of Applied Physics
Volume99
Issue number6
DOIs
Publication statusPublished - 14 Apr 2006

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

Cite this