Synthesis, Characterization, and Luminescence Properties of the Ternary Europium Complex Covalently Bonded to Mesoporous SBA-15

Peng, Chun‐Yun; Zhang, Hongjie; Yu, Jian; Meng, Qi; Fu, Lianshe; Li, Huanrong; Sun, Lining; Guo, Xianmin

doi:10.1021/jp051984n

Cited by 273 publications

(181 citation statements)

References 50 publications

(61 reference statements)

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“…For instance, the entrapment of lanthanide complexes into surface-modified mesoporous silica (MCM41, MCM48 and SBA15) by a two-step procedure has been widely studied. [86][87][88][89][90][91][92] In general, a lanthanide complex interacts with its surrounding silylating agents through weak hydrogen-bonding interactions, and optical processes (emission intensity, wavelength and lifetime) can be modulated depending on the lanthanide coordination.…”

Section: Luminescence Of Lanthanide Ions As a Probe In Mesostructuredmentioning

confidence: 99%

Photonic and nanobiophotonic properties of luminescent lanthanide-doped hybrid organic–inorganic materials

et al. 2008

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Research into lanthanide-doped organic-inorganic hybrid materials emerged in the 1990s with the development of interesting materials for optics: high efficiency and stable solid-state lasers, new fiber amplifiers and sensors, devices with upconversion, fast photochromic and non-linear responses, etc. Their interest relies on the possibility of combining properties of sol-gel host materials (shaping, tunable refractive index and mechanical properties, corrosion protection, specific adhesion, etc.) and the well-known luminescence of lanthanide ions (Ln). The fast development of photonic hybrids allowed the commercial exploitation of products with new or enhanced characteristics (megajoule pulsed Nd-YAG laser, protective coatings of glasses, screens or glasswares). However, recently, Ln-hybrid nanocomposites have found new applications in bio-sensors, bio-analytics and even clinical imaging diagnostics. These applications make use of the fluorescence properties of lanthanides that make luminescent hybrids ideal candidates for time-resolved fluoroimmunoassays, DNA hybridation assays, fluorescence imaging microscopy, or in vivo imaging. As a consequence, the goal of this review is twofold: (i) as a reminder of some general considerations that must be taken into account to design new optically active Ln-doped nanocomposites whatever the application field, and (ii) to show the most important advances achieved in the past years in different areas, paying special attention to bio-medical applications.

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Section: Luminescence Of Lanthanide Ions As a Probe In Mesostructuredmentioning

confidence: 99%

Photonic and nanobiophotonic properties of luminescent lanthanide-doped hybrid organic–inorganic materials

et al. 2008

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“…From a review of the literature [45,47,52,74,75] we find that the acac ligand has an S 0 → S 1 transition corresponding to ≈ 3.596 eV (345 nm), phen has an S 0 → S 1 transition corresponding to ≈ 3.263 eV (380 nm), and Dy 3+ 's primary luminescent state ( 4 F 9/2 ) is at ≈ 2.583 eV (480 nm). In our study we use a frequency tripled Nd:YAG laser with a wavelength of 355 nm for our excitation source, which places the excitation wavelength nearly resonant with acac's S 0 → S 1 transition.…”

Section: B Ligand Enhanced Luminescencementioning

confidence: 99%

“…One such material, satisfying this criterion is [Dy(acetylacetonate) 3 (1,10-phenanthroline)] ([Dy(acac) 3 (phen)]) [52,[70][71][72][73], which is the subject material of this study. To demonstrate the energy level spacing of the ligands and Dy ion we provide a simplified energy level diagram in Figure 1 where the energy levels are taken from the literature [45,47,52,74,75]. Note that in general there are many more energy levels for the ligands and Dy than displayed in Figure 1, but we simplify the diagram to highlight the relevant transitions.…”

Section: B Ligand Enhanced Luminescencementioning

confidence: 99%

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

2017

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We develop a two-color thermometry (TCT) phosphor based on [Y1−xDyx(acetylacetonate)3(1,10-phenanthroline)] ([Y1−xDyx(acac)3(phen)]) molecular crystals for use in heterogeneous materials. We characterize the optical properties of [Y1−xDyx(acac)3(phen)] crystals at different temperatures and Dy concentrations and find that the emission is strongly quenched by increasing temperature and concentration. We also observe a broad background emission (due to the ligands) and find that [Y1−xDyx(acac)3(phen)] photodegrades under 355 nm illumination with the photodegradation resulting in decreased luminescence intensity. However, while decreasing the overall emission intensity, photodegradation is not found to influence the integrated intensity ratio of the 4 I 15/2 → 6 H 15/2 and 4 F 9/2 → 6 H 15/2 transitions. This ratio allows us to compute the temperature of the complex Based on the temperature dependence of these ratios we calculate that [Y1−xDyx(acac)3(phen)] has a maximum sensitivity of 1.5 % K −1 and our TCT system has a minimum temperature resolution of 1.8 K. Finally, we demonstrate the use of [Y1−xDyx(acac)3(phen)] as a TCT phosphor by determining a dynamic temperature profile using the emission from [Y1−xDyx(acac)3(phen)].

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“…The Judd-Ofelt approach is important because it makes it possible to replace some parameters that are quite difficult to accurately estimate theoretically by experimental parameters easily obtained by fitting optical absorption or emission (line strength) data. This enables us to estimate radiative rates for the Ln 3+ ion-matrix combinations with the aid of simple absorption or photoluminescence experiments 61 .…”

Section: Photon Absorption and Emission -Judd-ofelt Theorymentioning

confidence: 99%

“…However since the ED transitions for the Ln 3+ ions are, in principle, forbidden and only partly allowed because of the perturbations caused by the host crystal, the spectral signatures of ED and MD transitions may be comparable in specific cases. MD transitions are only weakly affected by the crystal field and they can therefore be used as a benchmark for ED transitions described by the Judd-Ofelt formalism 61 .…”

Section: Photon Absorption and Emission -Judd-ofelt Theorymentioning

confidence: 99%

Lanthanide upconversion luminescence at the nanoscale: fundamentals and optical properties

2016

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Upconversion photoluminescence is a nonlinear effect where multiple lower energy excitation photons produce higher energy emission photons. This fundamentally interesting process has many applications in biomedical imaging, light source and display technology, and solar energy harvesting. In this review we discuss the underlying physical principles and their modelling using rate equations. We discuss how the understanding of photophysical processes enabled strategic influence over the optical properties of upconversion especially in rationally designed materials. We subsequently present an overview of recent experimental strategies to control and optimize the optical properties of upconversion nanoparticles, focussing on their emission spectral properties and brightness. TOC

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Synthesis, Characterization, and Luminescence Properties of the Ternary Europium Complex Covalently Bonded to Mesoporous SBA-15

Cited by 273 publications

References 50 publications

Photonic and nanobiophotonic properties of luminescent lanthanide-doped hybrid organic–inorganic materials

Photonic and nanobiophotonic properties of luminescent lanthanide-doped hybrid organic–inorganic materials

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

Lanthanide upconversion luminescence at the nanoscale: fundamentals and optical properties

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