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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Photoluminescence tuning and energy transfer process from Tb3+ to Eu3+ in GPTMS/TEOS-derived organic/silica hybrid films

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Author(s):
de Vicente, F. S. [1] ; Freddi, P. [1] ; Otuka, A. J. G. [2] ; Mendonca, C. R. [2] ; Brito, H. F. [3] ; Nunes, L. A. O. [2] ; Vollet, D. R. [1] ; Donatti, D. A. [1]
Total Authors: 8
Affiliation:
[1] Univ Estadual Paulista, UNESP, Dept Fis, IGCE, BR-13506900 Rio Claro, SP - Brazil
[2] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[3] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, BR-05508000 Sao Paulo, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Luminescence; v. 197, p. 370-375, MAY 2018.
Web of Science Citations: 0
Abstract

In this work the photoluminescence study and energy transfer from Tb3+ to Eu3+-beta-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 Ln(3+)-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 40.0x10(18) ions/cm(3) and Eu3+ concentrations of 0, 0.03, 0.05, 0.1, 0.3, 0.5, 1.0, 1.5, and 2.0x10(18) ions/cm(3) were studied. The films presented characteristic transitions D-5(4)-F-7(6-3) of Tb3+ ions and D-5(0)-F-7(0-4) of Eu3+ ions measured on the visible spectrum region. Energy transfer from Terbium to Europium was studied through emission decay time measurements of D-5(4)-F-7(5) transition of Tb3+ (547 nm) which showed an accentuated decrease (from 1329 to 55 mu s) due to the co-doping with Eu3+ ions concentrations varied from 0.03 to 1.5x10(18) ions/cm(3). Energy transfer rate (WET) of 17.4x10(3) s(-1) and relative energy transfer efficiency (eta(T)) of 96% were observed for films samples co-doped with 40x10(18) ions/cm(3) of Tb3+ and 1.5x10(18) ions/cm(3) of Eu3+. Due to the variation in WET and eta(T) from Tb3+ to Eu3+, the intensity ratios of Tb3+ band at 547 nm (D-5(4)-F-7(5)) and Eu3+ band at 617 nm (D-5(0)-F-7(2)) 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. (AU)

FAPESP's process: 16/20094-8 - Fabrication of biocompatible and biologically active platforms using laser processing techniques
Grantee:Adriano José Galvani Otuka
Support Opportunities: Scholarships in Brazil - Post-Doctoral