Enhanced Eu3+ emission by non-radiative energy transfer from Tb3+ in zinc phosphate glass

Joshi, B. C.

doi:10.1016/0022-3093(94)00478-1

Cited by 82 publications

(23 citation statements)

References 12 publications

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“…Terbium (Tb 3ϩ ) and europium (Eu 3ϩ ) were chosen as dopants to study the degree of ET within a single NP because both exhibit a strong, easily measured, visible photoluminescence and Tb 3ϩ is known to act as a sensitizer to Eu 3ϩ (20)(21)(22) Fig. 2b that the luminescence spectra of the mixed NP solution is approximately the sum of the peak intensities of the two ''pure'' NP emissions.…”

Section: Resultsmentioning

confidence: 99%

Controlling energy transfer between multiple dopants within a single nanoparticle

DiMaio

Sabatier²,

Kokuoz

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

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Complex core-shell architectures are implemented within LaF3 nanoparticles to allow for a tailored degree of energy transfer (ET) between different rare earth dopants. By constraining specific dopants to individual shells, their relative distance to one another can be carefully controlled. Core-shell LaF 3 nanoparticles doped with Tb 3؉ and Eu 3؉ and consisting of up to four layers were synthesized with an outer diameter of Ϸ10 nm. It is found that by varying the thicknesses of an undoped layer between a Tb 3؉ -doped layer and a Eu 3؉ -doped layer, the degree of ET can be engineered to allow for zero, partial, or total ET from a donor ion to an acceptor ion. More specifically, the ratio of the intensities of the 541-nm Tb 3؉ and 590 nm Eu 3؉ peaks was tailored from <0.2 to Ϸ2.4 without changing the overall composition of the particles but only by changing the internal structure. Further, the emission spectrum of a blend of singly doped nanoparticles is shown to be equivalent to the spectra of co-doped particles when a core-shell configuration that restricts ET is used. Beyond simply controlling ET, which can be limiting when designing materials for optical applications, this approach can be used to obtain truly engineered spectral features from nanoparticles and composites made from them. Further, it allows for a single excitation source to yield multiple discrete emissions from numerous lanthanide dopants that heretofore would have been quenched in a more conventional active optical material.core-shell ͉ rare earth T he past 10 years have witnessed an increase in research on rare earth-doped nanoparticles (NP) because of the numerous applications to which they may be applied. The rare earth ions, typically trivalent, although sometimes di-or tetravalent, can exhibit luminescent emissions ranging from 172 nm to Ͼ7 m providing that they are doped into a host of high intrinsic transparency and low vibrational energy. Because of such a broad spectral range of potential emissions, active NPs are being considered for practical use in LEDs (1), solar cell energy conversion (2, 3), lasers and amplifiers (4), and biological assaying (5, 6).Heavy metal halide crystals are known to be excellent host materials for rare earth ions because of their intrinsically low phonon energies. Unfortunately, they also tend to be hygroscopic, brittle, and not thermally robust. One solution to this problem was found in the development of glass-ceramics, where halide nanocrystallites are nucleated in an oxide glass matrix. Some of the optically active rare earth (RE) ions partition into the crystallites and emit from lower vibrational energy host nanocrystals with improved quantum efficiencies than if they were emitting from the oxide host matrix (7). For example, LaF 3 nanocrystals were precipitated from oxyfluoride compositions by Dejneka (8) to create glasses that were more easily processed than fluoride glasses while maintaining their superior optical properties over oxide glasses (8). While this approach is beneficial for improving t...

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Section: Resultsmentioning

confidence: 99%

Controlling energy transfer between multiple dopants within a single nanoparticle

DiMaio

Sabatier²,

Kokuoz

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

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show abstract

“…The reason is that the sensitized luminescence is not only of interest for applications but also for understanding of the basic mechanisms involved [8][9][10]. Many researchers have discussed the phenomena of radiative and non-radiative transitions in RE ions and succeeded in realizing energy transfer in co-doped glasses [11][12][13], as indicated by enhancement in the intensity of fluorescence or variation in the emitting levels lifetimes. It has also been observed that co-doping by Sm 3+ and Eu 3+ in zinc sodium phosphate glass leads to effective energy transfer that affects the emission from Eu 3+ ion [14].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic studies of Sm3+ and Eu3+ co-doped lithium borate glass

Elfayoumi

Farouk

Brik

et al. 2010

Journal of Alloys and Compounds

100

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“…The idea of energy transfer was strengthened by the decay curve analysis, which was fitted in second order exponential in Er 3+ -Eu 3+ co-doped glass, in place of single exponential used in singly doped Er 3+ glass. We have also calculated the energy transfer efficiencies ( ET ) using the equation given by Joshi [32].…”

Section: Resultsmentioning

confidence: 99%