Tunable green/red luminescence by infrared upconversion in biocompatible forsterite nanoparticles with high erbium doping uptake

Zampiva, Rúbia Young Sun; Acauan, Luiz; Venturini, Janio; Garcia, J. M.; Silva, Diego Silvério da; Han, Zhonghua; Kassab, L.R.P.; Wetter, Niklaus Ursus; Agarwal, Anuradha M.; Alves, Annelise Kopp; Bergmann, Carlos Pérez

doi:10.1016/j.optmat.2018.01.004

Cited by 20 publications

(8 citation statements)

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“…The PL intensity also varies in a quadratic manner with the excitation power (Figure 6b, ▽ and ○), evidencing a two-photon process for SHG and UC. 30,44,45 Regarding the UC efficiency, an indirect though common way to investigate it is to measure the green-to-red ratio (GRR) corresponding to the intensity ratio between the green and red emissions under a 980 nm excitation. 46,47 Indeed, the 4 F 9/2 level of Er 3+ , responsible for the red emission, is populated through the nonradiative de-excitations of the 4 S 3/2 level (dashed lines in Figure 7), itself responsible for the green emission.…”

Section: Resultsmentioning

confidence: 99%

“…29 The choice of Er 3+ ions lies on the known UC processes under excitation at 800 and 980 nm. 30 In this paper, a microwave-assisted hydrothermal route is presented to prepare phase-pure α-La(IO 3 ) 3 and α-(La, Er)(IO 3 ) 3 nanocrystals. The nanocrystal morphology was investigated by electron microscopy, and the size distribution was also studied in solution after dispersion of the raw powders in water or in ethylene glycol.…”

Section: Introductionmentioning

confidence: 99%

“…According to previous works on micron-sized lanthanum iodates, α-La(IO 3 ) 3 is known for its good SHG efficiency (comparable to that of LiIO 3 at the micrometer scale , ) and for being a host matrix for different lanthanides . The choice of Er 3+ ions lies on the known UC processes under excitation at 800 and 980 nm …”

Section: Introductionmentioning

confidence: 99%

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Microwave Synthesis and Up-Conversion Properties of SHG-Active α-(La, Er)(IO₃)₃ Nanocrystals

et al. 2019

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Pure α-La(IO 3 ) 3 and α-La 0.85 Er 0.15 (IO 3 ) 3 nanocrystals were synthesized by a microwave-assisted hydrothermal method leading to a reaction yield of 87 ± 4%. Electron microscopy and dynamic light scattering characterizations provide evidence for the formation of nanocrystals with an average size of 45 ± 10 nm for α-La(IO 3 ) 3 and 55 ± 10 nm for α-La 0.85 Er 0.15 (IO 3 ) 3 . When dispersed in ethylene glycol, the nanocrystal suspensions exhibit second-harmonic generation under near-infrared excitations at 800 and 980 nm whereas additional photoluminescence by up-conversion is simultaneously observed in the case of α-La 0.85 Er 0.15 (IO 3 ) 3 nanocrystals. Quantitative assessments of the second-harmonic generation efficiency from second-harmonic scattering experiments at 1064 nm result in relatively high ⟨d⟩ coefficients measured at 8.2 ± 2.0 and 8.0 ± 2.0 pm V −1 for α-La(IO 3 ) 3 and α-La 0.85 Er 0.15 (IO 3 ) 3 , respectively. The relative intensity between second-harmonic generation and photoluminescence is discussed following the excitation wavelength.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microwave Synthesis and Up-Conversion Properties of SHG-Active α-(La, Er)(IO₃)₃ Nanocrystals

et al. 2019

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“…Likewise, it has been previously shown that non-isolated Mg atoms were mostly coordinated by 6 oxygen atoms. It is also known that a Mg 2+ ion occupying a 6-coordinated oxygen site can be substituted more easily by an Er 3+ ion than by a Eu 3+ ion [28]. This observation is supported by considerations on ionic radii [29,30]: Er 3+ ionic radius, ranging from 0.89 Å (VI) to 0.945 Å (VII), is shorter than the one of Eu 3+ (0.947 Å (VI) -1.01 Å (VII)), and consequently closer to the one of Mg 2+ (0.72 Å).…”

Section: [Fig 6 Around Here]mentioning

confidence: 99%

In situ formation of rare-earth-doped nanoparticles in a silica matrix from Molecular Dynamics simulations

Turlier

Fourmont

Bidault

et al. 2020

Ceramics International

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Developing new rare-earth-doped optical glasses with "enhanced" spectroscopic properties requires the elaboration of new glass compositions. To overcome some typical limitations of silica glass, a strategy consists in encapsulating rare-earth (RE) ions within oxide nanoparticles (NPs) through a phase separation mechanism. In this paper, Molecular Dynamics simulations were performed using an interatomic potential reproducing the phase separation within a MgO-SiO2 binary melt to obtain RE-codoped glass models with RE = Eu or Er. In these structures, we observed that Mg-rich regions, included into a silica-rich matrix and identified as NPs, are amorphous and exhibit a large range of sizes. We showed that such nanoparticles are the host of a depolymerization phenomenon of the NPs' SiO4 tetrahedral network leading to a release of nonbridging oxygen atoms. In the NPs, the MgO concentration increases and the doping RE ions are mainly located into the NPs where they are over-concentrated compared with the nominal doping concentration.However, the induced clustering effect is limited because of the non-bridging-oxygen-rich environment encountered in the NPs. This numerical analysis allows to give an insight on the chemical composition of the NPs, and especially on the local environment of the encapsulated rare-earth ions.

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“…Synthesized forsterite nanoparticles have potential applications in enhanced weathering, namely sequestering CO 2 by mineral reactions [66][67][68][69][70], and as a biomaterial for implants [71][72][73][74][75]. Moreover, doping the forsterite nanomaterials with Eu 3+ , Tb 3+ , or Er 3+ induces enhancement of their photoluminescence properties [76][77][78], rendering them to have applications in optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Computational Simulation of Amorphous Silicates’ Structural, Dielectric, and Vibrational Spectroscopic Properties

2018

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Silicates are among the most abundant and important inorganic materials, not only in the Earth’s crust, but also in the interstellar medium in the form of micro/nanoparticles or embedded in the matrices of comets, meteorites, and other asteroidal bodies. Although the crystalline phases of silicates are indeed present in nature, amorphous forms are also highly abundant. Here, we report a theoretical investigation of the structural, dielectric, and vibrational properties of the amorphous bulk for forsterite (Mg2SiO4) as a silicate test case by a combined approach of classical molecular dynamics (MD) simulations for structure evolution and periodic quantum mechanical Density Functional Theory (DFT) calculations for electronic structure analysis. Using classical MD based on an empirical partial charge rigid ionic model within a melt-quenching scheme at different temperatures performed with the GULP 4.0 code, amorphous bulk structures for Mg2SiO4 were generated using the crystalline phase as the initial guess. This has been done for bulk structures with three different unit cell sizes, adopting a super-cell approach; that is, 1 × 1 × 2, 2 × 1 × 2, and 2 × 2 × 2. The radial distribution functions indicated a good degree of amorphization of the structures. Periodic B3LYP-geometry optimizations performed with the CRYSTAL14 code on the generated amorphous systems were used to analyze their structure; to calculate their high-frequency dielectric constants (ε∞); and to simulate their IR, Raman, and reflectance spectra, which were compared with the experimental and theoretical crystalline Mg2SiO4. The most significant changes of the physicochemical properties of the amorphous systems compared to the crystalline ones are presented and discussed (e.g., larger deviations in the bond distances and angles, broadening of the IR bands, etc.), which are consistent with their disordered nature. It is also shown that by increasing the unit cell size, the bulk structures present a larger degree of amorphization.

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Tunable green/red luminescence by infrared upconversion in biocompatible forsterite nanoparticles with high erbium doping uptake

Cited by 20 publications

References 56 publications

Microwave Synthesis and Up-Conversion Properties of SHG-Active α-(La, Er)(IO₃)₃ Nanocrystals

Microwave Synthesis and Up-Conversion Properties of SHG-Active α-(La, Er)(IO₃)₃ Nanocrystals

In situ formation of rare-earth-doped nanoparticles in a silica matrix from Molecular Dynamics simulations

Multiscale Computational Simulation of Amorphous Silicates’ Structural, Dielectric, and Vibrational Spectroscopic Properties

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Tunable green/red luminescence by infrared upconversion in biocompatible forsterite nanoparticles with high erbium doping uptake

Cited by 20 publications

References 56 publications

Microwave Synthesis and Up-Conversion Properties of SHG-Active α-(La, Er)(IO3)3 Nanocrystals

Microwave Synthesis and Up-Conversion Properties of SHG-Active α-(La, Er)(IO3)3 Nanocrystals

In situ formation of rare-earth-doped nanoparticles in a silica matrix from Molecular Dynamics simulations

Multiscale Computational Simulation of Amorphous Silicates’ Structural, Dielectric, and Vibrational Spectroscopic Properties

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Product

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Microwave Synthesis and Up-Conversion Properties of SHG-Active α-(La, Er)(IO₃)₃ Nanocrystals

Microwave Synthesis and Up-Conversion Properties of SHG-Active α-(La, Er)(IO₃)₃ Nanocrystals