Luminescent characteristic of the CsBr phosphor activated with Eu 2+ and Mn2+ ions

E. Téllez-Flores, R. Aceves*, R. Pérez-Salas, I. Camarillo, U. Caldiño

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Spectra of excitation and emission were measured at RT and 15 K in crystals quenched (Q) of CsBr:Eu2+, CsBr:Mn2+ and CsBr:Eu 2+,Mn2+. Emission bands at 444, 480, 520 and 570 nm with different relative intensities are generated in the samples after UV excitation. The blue band at 444 nm was ascribed with unknown clusters or aggregated centers (AC) of dipoles type Eu2+-VC- and insulated dipole centers (IDC) like Eu2+-O2-. The bands at 480, 520 and 570 nm were assigned to Cs4EuBr6 nanocrystals; AC containing MnBr42- units in tetrahedral symmetry and another yet unidentified AC defect, respectively. In crystals of CsBr:Eu 2+,Mn2+ the excitation and emission spectra taken at 15 K show no clear evidence of an energy transfer mechanism. Instead, the results suggest that the emission is produced by direct excitation of the ions of Eu2+ and Mn2+. Accordingly, single- or double-doped CsBr crystals may contain the same type of defects, either AC and/or IDC.

Original languageEnglish
Pages (from-to)22-25
Number of pages4
JournalJournal of Luminescence
Volume144
DOIs
StatePublished - 2013

Bibliographical note

Funding Information:
We thank Dr. Brown for allowing us the use of the X-ray diffraction system. This work was partially supported under Grants MAA 2009-11 ( SEP, México ) and CB-2007-83648-F ( CONACYT, México ).

Keywords

  • Aggregated centers
  • CsBr:Eu
  • CsBr:Mn
  • Phosphors
  • Photoluminescence
  • White LED

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