Luminescence studies on PZT:Eu 3+ sol-gel thin films

Jorge Garcia-Macedo, Jesús A.Martinez Zuñiga, Federico Gonzalez-Garcia, Guadalupe Valverde-Aguilar

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

PZT: Eu 3+ sol-gel thin films and bulk samples were synthesized by sol-gel method. The crystalline structure (perovskite) was obtained in these materials by heat treatment at different temperatures. The temperature for the films was lower than that used in the bulk samples to obtain the perovskite-type phase. X-ray diffraction shows the presence of the perovskite phase in both kinds of materials. Emission and excitation studies of the impurity Eu 3+ were made to determine its luminescence response. For PZT: Eu 3+ thin films, the excitation spectra shows a broad band from charge transfer and narrow peaks due to the 7F 05L 6 and 7F 15D 3 transitions with λo=612 nm; and due to 7F 05L 6 and 7F 05D 2 with λo=650 nm. The films exhibit a PZT pyrochlore phase. The decays show two general components: a fast one and a slow one. The bulk samples do not have the PZT pyrochlore phase, but a tetragonal phase was detected. They show hypersensitive transitions as 7F 05D 2 (excitation) and 5D 07F 2 (emission). These transitions reveal the presence of Eu 3+ in sites of low symmetry. In the bulk sample the luminescence decrease at 300°C, and disappear at higher temperature. It was recovered at 1000°C. Instead, the thin film recovers its luminescence at 600°C. This inhibition of the luminescence could be associated wit the crystallite size formed in the samples. The PZT: Eu 3+ thin films show several advantages in comparison to the bulk samples, as a short time of preparation, and a better perovskite phase obtained at lower temperature.

Original languageEnglish
Title of host publicationNanophotonic Materials III
DOIs
StatePublished - 2006
EventNanophotonic Materials III - San Diego, CA, United States
Duration: 13 Aug 200614 Aug 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6321
ISSN (Print)0277-786X

Conference

ConferenceNanophotonic Materials III
Country/TerritoryUnited States
CitySan Diego, CA
Period13/08/0614/08/06

Keywords

  • Luminescence
  • PZT
  • Rare earth
  • Sol-gel

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