TY - GEN
T1 - Luminescence studies on PZT:Eu 3+ sol-gel thin films
AU - Garcia-Macedo, Jorge
AU - Zuñiga, Jesús A.Martinez
AU - Gonzalez-Garcia, Federico
AU - Valverde-Aguilar, Guadalupe
PY - 2006
Y1 - 2006
N2 - 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 0→ 5L 6 and 7F 1→ 5D 3 transitions with λo=612 nm; and due to 7F 0→ 5L 6 and 7F 0→ 5D 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 0→ 5D 2 (excitation) and 5D 0→ 7F 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.
AB - 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 0→ 5L 6 and 7F 1→ 5D 3 transitions with λo=612 nm; and due to 7F 0→ 5L 6 and 7F 0→ 5D 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 0→ 5D 2 (excitation) and 5D 0→ 7F 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.
KW - Luminescence
KW - PZT
KW - Rare earth
KW - Sol-gel
UR - http://www.scopus.com/inward/record.url?scp=33751030812&partnerID=8YFLogxK
U2 - 10.1117/12.680867
DO - 10.1117/12.680867
M3 - Contribución a la conferencia
AN - SCOPUS:33751030812
SN - 0819464007
SN - 9780819464002
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Nanophotonic Materials III
T2 - Nanophotonic Materials III
Y2 - 13 August 2006 through 14 August 2006
ER -