Effects of High Pressure on the Luminescence and Upconversion Properties of Ti<sup>2+</sup>-Doped NaCl

Wenger, Oliver S.; Salley, G. Mackay; Güdel, Hans U.

doi:10.1021/jp021140t

Cited by 9 publications

(7 citation statements)

References 40 publications

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“…The investigation of NaCl crystal at high pressure is of considerable current interest, particularly in the case of elements. The knowledge of structural properties of NaCl at high pressure is important for high-pressure behavior investigations of solids. − For a long time, experiments to measure the structural properties of NaCl at high pressure remain a formidable challenge with existing measurement facilities. Furthermore, most of the theoretical work about the structural properties of NaCl is only performed at pressures below 70 GPa. ,,, We therefore think that it is worthwhile to perform a theoretical calculation for the structural properties of NaCl under high pressure in order to provide reference data for the experimentalists.…”

Section: Resultsmentioning

confidence: 99%

“…( 1 tigations of solids. [43][44][45][46] For a long time, experiments to measure the structural properties of NaCl at high pressure remain a formidable challenge with existing measurement facilities. Furthermore, most of the theoretical work about the structural properties of NaCl is only performed at pressures below 70 GPa.…”

Section: G*(v;p T) ) E(v)mentioning

confidence: 99%

“…With the rapid development of high-pressure techniques, there has been considerable interest in recent years in the investigations of the structural phase transition and high-pressure behavior in material because the knowledge of physical and chemical properties of material at high pressure is important for a variety of scientific and technological applications. − For instance, the optical properties, the thermodynamic properties, and the equation of state (EOS) of mineral material at high pressure is essential in the investigations of the interior of the earth in geophysics and for the investigations of the evolutions of stars in astrophysics. NaCl is one of the most widely used nonmetallic mineral materials.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the High-Pressure Structural Transition and Thermodynamic Properties in Sodium Chloride: A Computational Investigation on the Basis of the Density Functional Theory

2008

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Using first-principles calculations, the elastic constants, the thermodynamic properties, and the structural phase transition between the B1 (rocksalt) and the B2 (cesium chloride) phases of NaCl are investigated by means of the pseudopotential plane-waves method. The calculations are performed within the generalized gradient approximation to density functional theory with the Perdew-Burke-Ernzerhof exchange-correlation functional. On the basis of the third-order Birch-Murnaghan equation of states, the transition pressure Pt between the B1 phase and the B2 phase of NaCl is determined. The calculated values are generally speaking in good agreement with experiments and with similar theoretical calculations. From the theoretical calculations, the shear modulus, Young's modulus, rigidity modulus, and Poisson's ratio of NaCl are derived. According to the quasi-harmonic Debye model, we estimated the Debye temperature of NaCl from the average sound velocity. Moreover, the pressure derivatives of elastic constants, partial differentialC11/partial differentialP, partial differentialC12/partial differentialP, partial differentialC44/partial differentialP, partial differentialS11/partial differential P, partial differentialS12/partial differentialP, and partial differentialS44/partial differentialP, for NaCl crystal are investigated for the first time. This is a quantitative theoretical prediction of the elastic and thermodynamic properties of NaCl, and it still awaits experimental confirmation.

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Section: Resultsmentioning

confidence: 99%

Section: G*(v;p T) ) E(v)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of the High-Pressure Structural Transition and Thermodynamic Properties in Sodium Chloride: A Computational Investigation on the Basis of the Density Functional Theory

2008

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“…In the present case it clearly identifies the process in question as a resonant process, rather than a phonon-assisted one. The principle can be applied to any sharp line donor-acceptor pair with direct spectral overlap, offering for instance a way to tune upconversion efficiencies in transition metal ion [25] and co-doped lanthanide containing systems. 4 were synthesised according to the general literature method of Decurtins et al [26] For this, stoichiometric mixtures of 10 À2 m aqueous solutions of the starting materials except for NaCl, for which the concentration was 2 10 À2 m, were prepared.…”

Section: Discussionmentioning

confidence: 99%

Effect of External Pressure on the Excitation Energy Transfer from [Cr(ox)₃]³⁻ to [Cr(bpy)₃]³⁺ in [Rh_1−xCr_x(bpy)₃][NaM_1−yCr_y(ox)₃]ClO₄

2010

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Resonant excitation energy transfer from [Cr(ox)(3)](3-) to [Cr(bpy)(3)](3+) in the doped 3D oxalate networks [Rh(1-x)Cr(x)(bpy)(3)][NaM(III) (1-y)Cr(y)(ox)(3)]ClO(4) (ox=C(2)O(4) (-), bpy=2,2'-bipyridine, M=Al, Rh) is due to two types of interaction, namely super exchange coupling and electric dipole-dipole interaction. The energy transfer probability for both mechanisms is proportional to the spectral overlap of the (2)E→(4)A(2) emission of the [Cr(ox)(3)](3-) donor and the (4)A(2)→(2)T(1) absorption of the [Cr(bpy)(3)](3+) acceptor. The spin-flip transitions of (pseudo-)octahedral Cr(3+) are known to shift to lower energy with increasing pressure. Because the shift rates of the two transitions in question differ, the spectral overlap between the donor emission and the acceptor absorption is a function of applied pressure. For [Rh(1-x)Cr(x)(bpy)(3)][NaM(1-y)Cr(y)(ox)(3)]ClO(4) the spectral overlap is thus substantially reduced on increasing pressure from 0 to 2.5 GPa. As a result, the energy transfer probability decreases with increasing pressure as evidenced by a decrease in the relative emission intensity from the [Cr(bpy)(3)](3+) acceptor.

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“…Similarly, Wenger et al investigated the luminescence properties of 3d‐metal systems (NaCl:Ti 2+ and CsCdCl 3 :Ni 2+ ) under an external hydrostatic pressure. The pressure‐dependent luminescence spectra of NaCl:Ti 2+ at 15 K under 15454 cm −1 excitation were reported . Each spectrum includes two broad emission bands: one located in the visible area and another one located in the NIR range.…”

Section: Metal Ion‐doped Phosphorsmentioning

confidence: 99%

Tuning the Luminescence of Phosphors: Beyond Conventional Chemical Method

Bai

Tsang

Hao

2014

Advanced Optical Materials

134

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thermoluminescence (TL), and so on. [ 2 ] Nowadays, a large number of phosphors have been synthesized and developed, each one having its own characteristic emission wavelength, bandwidth, and luminescence lifetime. Here, the lifetime normally means the time in which the emission intensity decays to 1/ e . Moreover, phosphors have been extensively utilized in many areas, both scientifi c research and practical applications. For instance, phosphor-converted fl uorescent lamps and white light-emitting devices (LEDs) have been used as light sources in a widespread range of daily life and industrial applications. [ 3 ] CL and EL phosphors have been applied to traditional or modern display devices presenting visual information. [ 4 ] In the past few decades, fl uorescent nanoparticles, such as quantum dots (QDs) [ 5 ] and lanthanide (Ln) ion-doped nanocrystals, [ 6 ] have attracted considerable attention and showed great promise in fl uorescent probes, biosensing, bioimaging, therapies, and optoelectronic devices. [ 7 ] The ability to tune the luminescence properties of phosphors is highly desired in the optical materials community. [ 8 ] For various applications such as solid-state lasers, bioimaging, optical sensing, and display devices, precise control over the luminescence properties is essential for optimizing the performance and processing of optical devices and systems. Tuning luminescence is also of great signifi cance for fundamental studies of the luminescence mechanisms of phosphors. In general, tuning luminescence in the visible region is popularly known as varying the emission colour and brightness obtained by the naked eye. Broadly speaking, tuning luminescence changes the emission intensity, wavelength, bandwidth, luminescence decay or lifetime, and polarization.Numerous studies have extensively focused on tuning the luminescence of phosphors by conventional chemical ways, typically changing chemical compositions, crystal structure, phase, nanocrystal size, surface groups, and so on. [ 9 ] Comparatively, there have been less results that show the tunable luminescence of phosphors through physical methods. So far, few attempts have been made to provide a comprehensive coverage of the strategies pertaining to this emerging research fi eld and a broad overview of research advances in diverse areas of application. In this review, chemically driven luminescence tuning is Tuning the luminescence of phosphors is extremely important in controlling and processing light for active components of light sources, optical sensing, display devices, and biomedicine. So far, conventional chemical approaches have routinely been employed to modify the luminescence during the phosphor's synthesis. It is interesting to broaden the modulation of luminescence by physical methods, such as electric fi eld, magnetic fi eld, mechanical stress, temperature, photons, ionizing radiation, and so on. Since some physical methods may provide unusual routes to tune the luminescence in in-situ, real-time, dynamical and reversible mann...

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Effects of High Pressure on the Luminescence and Upconversion Properties of Ti²⁺-Doped NaCl

Cited by 9 publications

References 40 publications

Characterization of the High-Pressure Structural Transition and Thermodynamic Properties in Sodium Chloride: A Computational Investigation on the Basis of the Density Functional Theory

Characterization of the High-Pressure Structural Transition and Thermodynamic Properties in Sodium Chloride: A Computational Investigation on the Basis of the Density Functional Theory

Effect of External Pressure on the Excitation Energy Transfer from [Cr(ox)₃]³⁻ to [Cr(bpy)₃]³⁺ in [Rh_1−xCr_x(bpy)₃][NaM_1−yCr_y(ox)₃]ClO₄

Tuning the Luminescence of Phosphors: Beyond Conventional Chemical Method

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Effects of High Pressure on the Luminescence and Upconversion Properties of Ti2+-Doped NaCl

Cited by 9 publications

References 40 publications

Characterization of the High-Pressure Structural Transition and Thermodynamic Properties in Sodium Chloride: A Computational Investigation on the Basis of the Density Functional Theory

Characterization of the High-Pressure Structural Transition and Thermodynamic Properties in Sodium Chloride: A Computational Investigation on the Basis of the Density Functional Theory

Effect of External Pressure on the Excitation Energy Transfer from [Cr(ox)3]3− to [Cr(bpy)3]3+ in [Rh1−xCrx(bpy)3][NaM1−yCry(ox)3]ClO4

Tuning the Luminescence of Phosphors: Beyond Conventional Chemical Method

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Product

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Effects of High Pressure on the Luminescence and Upconversion Properties of Ti²⁺-Doped NaCl

Effect of External Pressure on the Excitation Energy Transfer from [Cr(ox)₃]³⁻ to [Cr(bpy)₃]³⁺ in [Rh_1−xCr_x(bpy)₃][NaM_1−yCr_y(ox)₃]ClO₄