Enhancement of white light emission from novel Ca3Y 2Si3O12: Dy3+ phosphors with Ce 3+ ion codoping

Vengala Rao Bandi, Yung Tang Nien, In Gann Chen

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Abstract

The luminescent properties of the Ce3+ or Dy3+ singly doped and Ce3+/Dy3+ codoped in Ca3Y 2Si3O12 novel phosphors were investigated, which are prepared by a sol-gel method. Ce3+ doped phosphor showed a brighter and broader violet-blue color emission band with a maximum peak centered at 389 nm, which is attributed to the parity and spin allowed 5d-4f transition. Photoluminescence spectra reveals that the white color emission is originated from the mixtures of two characteristic emission bands of Dy 3+ ion, viz., the 473 nm blue emission (4F 9/2-6H15/2) and the 580 nm yellow emission (4F9/2-6H13/2). Codoping of Ce 3+ has enhanced the luminescence of Dy3+ quite significantly upon the UV excitation wavelength (242 nm) and the optimized codopant concentration of Ce3+ is found to be 3 mol %. The mechanism involved in the energy transfer between Ce3+ and Dy3+ has been elucidated by an energy level diagram. The structure and morphology of the prepared samples have been analyzed by x-ray diffraction and transmission electron microscope.

Original languageEnglish
Article number023111
JournalJournal of Applied Physics
Volume108
Issue number2
DOIs
Publication statusPublished - 2010 Jul 15

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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