Photoluminescence tuning and energy transfer process from Tb3+ to Eu3+ in GPTMS/TEOS-derived organic/silica hybrid films.
VICENTE, F. S.; FREDDI, P.; OTUKA, A. J. G.; MENDONÇA, Cleber Renato; BRITO, Hermi Felinto de; OLIVEIRA, Luiz Nunes de; VOLLET, D. R.; DONATTI, D. A.
VICENTE, F. S.; FREDDI, P.; OTUKA, A. J. G.; MENDONÇA, Cleber Renato; BRITO, Hermi Felinto de; OLIVEIRA, Luiz Nunes de; VOLLET, D. R.; DONATTI, D. A.
 Abstract: In this work the photoluminescence study and energy transfer from Tb3+ to Eu3+-ß-diketonate complexes incorporated into organic/Silica hybrid films derived from 3-glycidoxypropyltrimethoxysilane (GPTMS) and tetraethylorthosilicate (TEOS) alkoxysilanes were investigated. Highly homogeneous and transparent films of Ln3+-doped GPTMS/TEOS-derived organic/silica hybrids were obtained from the organic/silica sols prepared by sol-gel. Tb3+:Eu3+-doped GPTMS/TEOS-derived films showed very intense luminescence when excited with UV light. Films co-doped with Tb3+ concentration fixed at 40.0×10^18 ions/cm3 and Eu3+ concentrations of 0, 0.03, 0.05, 0.1, 0.3, 0.5, 1.0, 1.5, and 2.0×10^18 ions/cm3 were studied. The films presented characteristic transitions 5D4-7F6-3 of Tb3+ ions and 5D0-7F0-4 of Eu3+ ions measured on the visible spectrum region. Energy transfer from Terbium to Europium was studied through emission decay time measurements of 5D4-7F5 transition of Tb3+ (547 nm) which showed an accentuated decrease (from 1329 to 55 µs) due to the co-doping with Eu3+ ions concentrations varied from 0.03 to 1.5×10^18 ions/cm3. Energy transfer rate (WET) of 17.4×10^3 s-1 and relative energy transfer efficiency ('eta'T) of 96% were observed for films samples co-doped with 40×10^18 ions/cm3 of Tb3+ and 1.5×10^18 ions/cm3 of Eu3+. Due to the variation in WET and 'eta'T from Tb3+ to Eu3+, the intensity ratios of Tb3+ band at 547 nm (5D4-7F5) and Eu3+ band at 617 nm (5D0-7F2) vary remarkably making the co-doped film samples exhibit different luminescence colors varying from green to orange and red which can be tuned by the Tb3+/Eu3+ ratio incorporated into the samples. | |
| Journal of Luminescence |
| v. 197, p. 370-375 - Ano: 2018 |
| Fator de Impacto: 2,686 |
| http://dx.doi.org/10.1016/j.jlumin.2017.12.048 |  @article={002874556,author = {VICENTE, F. S.; FREDDI, P.; OTUKA, A. J. G.; MENDONÇA, Cleber Renato; BRITO, Hermi Felinto de; OLIVEIRA, Luiz Nunes de; VOLLET, D. R.; DONATTI, D. A.},title={Photoluminescence tuning and energy transfer process from Tb3+ to Eu3+ in GPTMS/TEOS-derived organic/silica hybrid films},journal={Journal of Luminescence},note={v. 197, p. 370-375},year={2018}} |
