Modification of the luminescence spectra of chloro(tetrapyridylcyclotetramine)europium complexes by fine tuning of the Eu–Cl distance with outer-sphere counterions in the solid state, in a polymer matrix and in solution

2008 ◽  
pp. 1671 ◽  
Author(s):  
Atsushi Wada ◽  
Masayuki Watanabe ◽  
Yoshinori Yamanoi ◽  
Hiroshi Nishihara
Keyword(s):  
Solid State ◽  
Polymer Matrix ◽  
Outer Sphere ◽  
Fine Tuning ◽  
Luminescence Spectra ◽  
Europium Complexes ◽  
The Eu

Synthesis and Luminescence Properties of Three Europium Complexes with Phenanthroline Derivatives and β-Diketonates

2012 ◽  
Vol 455-456 ◽  
pp. 671-676
Author(s):  
Chao Long Yang ◽  
Jian Xin Luo ◽  
Li Yan Liang ◽  
Man Geng Lu
Keyword(s):  
Quantum Efficiency ◽  
Luminescence Properties ◽  
Luminescence Spectra ◽  
Europium Complexes ◽  
Element Analysis ◽  
H Nmr ◽  
Characteristic Emission ◽  
Ft Ir ◽  
The Eu ◽  
Eu Complexes

Three novel Eu-complexes based on phenanthroline derivatives as second ligands have been synthesized and characterized by element analysis, 1H NMR, FT-IR, UV-vis, and PL. The luminescence spectra presented characteristic emission lines of Eu3+ ion. The results of luminescence spectra indicated that the Eu3+ ion occupied only a single site, and the ligand filed surrounding the Eu3+ ion was highly polarizable. Meanwhile, all complexes exhibited relative high luminescence quantum efficiency (η). Among these Eu-complexes, the complex Eu (DBM)3HPIP exhibited the lowest quantum efficiency due to the presence of O-H oscillators in this complex, the result indicated different phenanthroline derivatives as second ligands can significantly influence the luminescence properties of Eu-complexes.

Thermodynamics of the hydration equilibrium derived from the luminescence spectra of the solid state for the case of the Eu–EDTA system

2015 ◽  
Vol 17 (44) ◽  
pp. 29558-29565 ◽  
Author(s):  
R. Janicki ◽  
A. Mondry
Keyword(s):  
Solid State ◽  
Luminescence Spectra ◽  
Spectroscopic Evidence ◽  
System P ◽  
The Eu

Spectroscopic evidence of the hydration equilibrium for the case of the Eu–EDTA system.

Hydrothermal Synthesis and Solid-State Laser Refrigeration of Ytterbium-Doped Potassium Lutetium Fluoride (KLF) Microcrystals

2020 ◽  
Author(s):  
Xiaojing Xia ◽  
Anupum Pant ◽  
Xuezhe Zhou ◽  
Elena Dobretsova ◽  
Alex Bard ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Solid State ◽  
Information Science ◽  
Point Group ◽  
Solid State Laser ◽  
Lanthanide Ions ◽  
Group Symmetry ◽  
Luminescence Spectra ◽  
Crystalline Phases ◽  
State Laser

Fluoride crystals, due to their low phonon energies, are attractive hosts of trivalent lanthanide ions for applications in upconverting phosphors, quantum information science, and solid-state laser refrigeration. In this article, we report the rapid, low-cost hydrothermal synthesis of potassium lutetium fluoride (KLF) microcrystals for applications in solid-state laser refrigeration. Four crystalline phases were synthesized, namely orthorhombic K<sub>2</sub>LuF<sub>5</sub> (Pnma), trigonal KLuF<sub>4</sub> (P3<sub>1</sub>21), orthorhombic KLu<sub>2</sub>F<sub>7</sub> (Pna2<sub>1</sub>), and cubic KLu<sub>3</sub>F<sub>10</sub> (Fm3m), with each phase exhibiting unique microcrystalline morphologies. Luminescence spectra and emission lifetimes of the four crystalline phases were characterized based on the point-group symmetry of trivalent cations. Laser refrigeration was measured by observing both the optomechanical eigenfrequencies of microcrystals on cantilevers in vacuum, and also the Brownian dynamics of optically trapped microcrystals in water. Among all four crystalline phases, the most significant cooling was observed for 10%Yb:KLuF<sub>4</sub> with cooling of 8.6 $\pm$ 2.1 K below room temperature. Reduced heating was observed with 10%Yb:K<sub>2</sub>LuF<sub>5</sub>

Solid-state Reversible Optical Switch Based on Two Dendritic Molecules with dual sensitivity of mechanochromism and photochromism

2021 ◽  
Author(s):  
Yuhui Yang ◽  
Zhe He ◽  
Junzhao He ◽  
Yuqing Li ◽  
Yilong Chen ◽  
...  
Keyword(s):  
Solid State ◽  
Polymer Matrix ◽  
Optical Switch ◽  
New Method ◽  
Photochromic Molecules ◽  
Conformational Freedom

Efficient isomerization of photochromic molecules requires conformational freedom and is often limited to the solution or polymer matrix. Thus, developing a new method to improve photochromism in the solid state...

A ligand field theory-based methodology for the characterization of the Eu 2+ [Xe]4f 6 5d 1 excited states in solid state compounds

2015 ◽  
Vol 622 ◽  
pp. 120-123 ◽  
Author(s):  
Amador García-Fuente ◽  
Fanica Cimpoesu ◽  
Harry Ramanantoanina ◽  
Benjamin Herden ◽  
Claude Daul ◽  
...  
Keyword(s):  
Field Theory ◽  
Solid State ◽  
Excited States ◽  
Ligand Field ◽  
Ligand Field Theory ◽  
The Eu

Eu3+ Ion Luminescence Spectra from Lanthanide Sesquioxides Exhibiting Three Different Crystal Structures

1992 ◽  
Vol 46 (2) ◽  
pp. 273-276 ◽  
Author(s):  
G. Chen ◽  
R. G. Haire ◽  
J. R. Peterson
Keyword(s):  
Crystal Structure ◽  
Crystal Structures ◽  
Room Temperature ◽  
Luminescence Spectra ◽  
Spectral Splitting ◽  
The Eu

We have investigated the Eu3+ ion luminescence spectra from different host crystals of the lanthanide sesquioxides exhibiting either the A, B, or C form. The Eu3+ ion luminescence spectra from B-type Eu2O3 and from Eu3+-doped A-type La2O3 and C-type Lu2O3 were obtained at room temperature. It is suggested that the luminescence from f-f transitions in the Eu3+ ion can be used to determine the crystal structure, because the different Eu3+ ion site symmetries in the different crystal structures give rise to different characteristic spectral splitting patterns.

scholarly journals Electrochemiluminescence Study of Europium (III) Complex with Coumarin3-Carboxylic Acid

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Stefan Lis ◽  
Krzysztof Staninski ◽  
Tomasz Grzyb
Keyword(s):  
Aqueous Solution ◽  
Spectral Analysis ◽  
Energy Transfer ◽  
Solid State ◽  
Carboxylic Acid ◽  
Elemental Analysis ◽  
Aluminium Electrode ◽  
The Eu

The europium (III) complex of coumarin-3-carboxylic acid (C3CA) has been prepared and characterized on the basis of elemental analysis, IR, and emission (photoluminescence and electrochemiluminescence) spectroscopy. The synthesised complex having a formula Eu was photophysically characterized in solution and in the solid state. Electrochemiluminescence, ECL, of the system containing the Eu(III)/C3CA complex was studied using an oxide-covered aluminium electrode. The goal of these studies was to show the possibility of the use of electrochemical excitation of the Eu(III) ion in aqueous solution for emission generation. The generated ECL emission was very weak, and therefore its measurements and spectral analysis were carried out with the use of cut-off filters method. The studies proved a predominate role of the ligand-to-metal energy transfer (LMET) in the generated ECL.

Molecular Motion Analysis of 5CB in PDLCs Using Solid-State 13C NMR Relaxation Spectroscopy

1993 ◽  
Vol 47 (7) ◽  
pp. 933-941 ◽  
Author(s):  
Karen L. Buchert ◽  
Jack L. Koenig ◽  
Shi-Qing Wang ◽  
John L. West
Keyword(s):  
Liquid Crystal ◽  
Solid State ◽  
Polymer Matrix ◽  
Nmr Relaxation ◽  
Domain Size ◽  
Chemical Structures ◽  
Similar Chemical ◽  
Polymer Dispersed ◽  
Submicron Droplets ◽  
Significant Change

In samples of polymer-dispersed liquid crystals (PDLCs), submicron droplets of liquid crystal reside within a polymer matrix. By the use of the cross polarization technique for solid-state 13C NMR spectroscopy, the NMR spectrum of the liquid crystal can be obtained without interference from the polymer spectrum, even though the two materials have some similar chemical structures. Both 13C T1 and 13C T1 ρ relaxation experiments were performed on a PDLC system of 5CB in epoxy as a function of 5CB domain size. The 13C T1 relaxation constants and the localized motions they measure showed no significant change over the liquid crystal domain size studied. However, the 13C T1 ρ relaxation constants and the segmental motions of molecules they measure revealed a significant change over the liquid crystal domain size studied. Therefore, the 13C T1 ρ values can be used to determine the change in mobility of the molecular segments of the SCB molecules resulting from increased interaction between the liquid crystal and the polymer matrix and to further understand the importance of the molecular motions of the liquid crystal in the switching phenomenon for PDLC materials.

Er3+Incorporated Transparent Ternary Nanocomposite as Active Core Material in Polymer Optical Preform with Improved Photo-emission Performance

2021 ◽  
Vol 04 ◽  
Author(s):  
Ipsita Chinya ◽  
Ranjan Sen ◽  
Anirban Dhar
Keyword(s):  
Polymer Matrix ◽  
In Situ Polymerization ◽  
Fine Tuning ◽  
Core Material ◽  
Scattering Loss ◽  
Quenching Effect ◽  
Ternary Nanocomposite ◽  
Active Core ◽  
20 Nm ◽  
Re Elements

Background: A polymer as a host in the optical waveguide has many advantages and, when doped with rare-earth (RE) elements, offers an efficient connection, compared to its glass-based counterparts as an amplifier. However, a polymer matrix causes the concentration quenching effect of REs in the polymer matrix, making the fabrication of RE-doped polymer waveguides more complicated as compared to the fabrication of glass-based complements. Moreover, controlling scattering loss at the particle-polymer interface for maintaining the optical clarity of the composite is also a great challenge. Objective: The main aim of the present study was to optimize the synthesis of Er2O3grafted Polymethylmethacrylate (PMMA)-Polystyrene (PS) composite based transparent ternary nanocomposite and its characterization to implement them as a potential material for active core in Polymer Optical Preform (POP). Methods: Nano Erbium Oxide (Er2O3) was successfully synthesized by the wet-chemical method and encapsulated by a polymerizable surfactant, i.e., 3-Methacyloxypropyltrimethoxy silane (MPS). The encapsulated nanoparticles were further subjected to grafting with PMMA using in-situ polymerization of methyl methacrylate (MMA) followed by blending with PS via solvent mixing technique. Results: The optical transparency of the ternary composite was achieved by fine-tuning the diameter (15-20 nm) of the PMMA coated Er2O3. The crystallinity present in Er2O3 was significantly reduced after PMMA coating. The comparatively higher refractive index obtained at 589 nm wavelength for the synthesized material indicated its usability as active core material in the presence of a commercial acrylate cladding tube. A photoluminescence (Pl) study indicated that the technique might be used for a higher level of Er3+doping in polymer matrix without sacrificing its transparency. Conclusion: The obtained results indicated that the sample synthesized with the adopted technique gives better Pl intensity compared to the other methods of Er3+ incorporation in polymer optical preform (POP).

Investigating structure-fluorescence properties of imidazole fused tetraphenylethylene AIEgens: Reversible mechanofluorochromism and polymer matrix controlled fluorescence tuning

CrystEngComm ◽  
2021 ◽  
Author(s):  
Palaniyappan Nagarasu ◽  
Anu Kundu ◽  
Vijay Thiruvenkatam ◽  
Raghavaiah Pallepogu ◽  
Philip Philip Anthony ◽  
...  
Keyword(s):  
Solid State ◽  
Polymer Matrix ◽  
Fluorescence Properties ◽  
Stimuli Responsive ◽  
Fluorescent Properties ◽  
Imidazole Derivatives

A series of stimuli-responsive AIEgens of tetraphenylethyelene (TPE) fused Imidazole derivatives (1-7) were synthesized and explored their substituents controlled fluorescent properties in the solid state. The structure of the synthesized...

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