The mechanism of photobleaching in Sm2+-doped alkaline-earth fluorohalides

Weiping Qin, Kiwan Jang, Seongtae Park, Yong Ill Lee, Changdae Kim

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The fluorescence intensity of divalent samarium (Sm2+) ions doped in alkaline-earth fluorohalides were found to decrease under the optical excitation from a blue laser, a green laser or even a red laser. This photobleaching effect has a mysterious and unknown mechanism. After the bleaching effect happened, no Sm3+ ions generation, no relative spectral change in Sm2+ emissions and no lifetime decrease for the levels of Sm2+ ions could be observed. Under blue- or green-laser irradiation, the decrease of Sm2+ fluorescence showed a perfect biexponential function; however, when the exciting photon energy was lower than that of 5D07F0 transition, the photobleaching effect could not be observed anymore. An identical mechanism in the photobleaching with that in the spectral hole burning was proposed.

Original languageEnglish
Pages (from-to)9-16
Number of pages8
JournalJournal of Luminescence
Volume113
Issue number1-2
DOIs
StatePublished - May 2005
Externally publishedYes

Keywords

  • Irradiation
  • Photobleaching
  • Photoluminescence

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