Low temperature optical study of manganous chloride

Régis, M.; Farge, Y.

doi:10.1051/jphys:01976003705062700

Cited by 23 publications

(6 citation statements)

References 16 publications

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“…The nearest neighbour Mn 2 + -Mn 2 + distance within the layers is 3.82 . Both compounds are low-temperature antiferromagnets with NØel temperatures T N = 1.96 and 2.16 K for MnCl 2 [18] and MnBr 2 , [19] respectively. Partial two-dimensional magnetic order is persistent to temperatures far above the NØel temperature.…”

Section: Resultsmentioning

confidence: 99%

Cooperative Near‐IR to Visible Photon Upconversion in Yb³⁺‐Doped MnCl₂ and MnBr₂: Comparison with a Series of Yb³⁺‐Doped Mn²⁺ Halides

Gerner

Reinhard

Güdel

2004

Chemistry A European J

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Yb3+-doped MnCl2 and MnBr2 crystals exhibit strong red upconversion luminescence under near-infrared excitation around 10 000 cm(-1) at temperatures below 100 K. The broad red luminescence band is centred around 15 200 cm(-1) for both compounds and identified as the Mn2+ 4T1g-->6A1g transition. Excitation with 10 ns pulses indicates that the upconversion process consists of a sequence of ground-state and excited-state absorption steps. The experimental VIS/NIR photon ratio at 12 K for an excitation power of 191 mW focused on the sample with a 53 mm lens is 4.1% for MnCl2:Yb3+ and 1.2% for MnBr2:Yb3+. An upconversion mechanism based on exchange coupled Yb3+-Mn2+ ions is proposed. Similar upconversion properties have been reported for RbMnCl3:Yb3+, CsMnCl3:Yb3+, CsMnBr3:Yb3+, RbMnBr3:Yb3+, Rb2MnCl4:Yb3+. The efficiency of the upconversion process in these compounds is strongly dependent on the connectivity between the Yb3+ and Mn2+ ions. The VIS/NIR photon ratio decreases by three orders of magnitude along the series of corner-sharing Yb3+-Cl--Mn2+, edge-sharing Yb3+-(Cl-)2-Mn2+ to face-sharing Yb3+-(Br-)3-Mn2+ bridging geometry. This trend is discussed in terms of the dependence of the relevant super-exchange pathways on the Yb(3+)-Mn2+ bridging geometry.

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Section: Resultsmentioning

confidence: 99%

Cooperative Near‐IR to Visible Photon Upconversion in Yb³⁺‐Doped MnCl₂ and MnBr₂: Comparison with a Series of Yb³⁺‐Doped Mn²⁺ Halides

Gerner

Reinhard

Güdel

2004

Chemistry A European J

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“…MCD measurements were performed with what is now classical equipment and has been described elsewhere [15]. This apparatus gives directly the circular polarization rate versus wavelength.…”

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confidence: 99%

Optical properties and ferromagnetic order in K2 CuF4

Kleemann

Farge

1975

J. Phys. France

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A crystal field analysis of the 3d9 multiplet of Cu+ + in K2CuF4 is presented, taking into account optical absorption spectra, linear dichroism, and the anisotropy of the g tensor. The calculations are based on local D'4h symmetry arising from elongated ligand octahedra with their long axes in the c planes, as it has been proposed theoretically and confirmed by X-ray studies. An additional orthorhombic distortion must be assumed to explain the dichroic properties. Magnetic circular dichroism, Faraday rotation, and magnetic field dependence of the linear birefringence have been used to measure in- and out-of-plane magnetization curves below Tc = 6.25 K. The Faraday rotary dispersion in the visible region and domain effects are discussed

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“…Table 2. Comparison between experimental energies at the band maximum and calculated excitedstate energies of Mn 2+ in NH 4 MnCl 3 from the T = 10 K excitation spectrum detecting PL at 1.82 eV (figure 6), and in MnCl 2 from the T = 4 K OA [46]. The fit parameters B, C, and 10Dq, together with the calculated energies, are also included for comparison purposes.…”

Section: Time-resolved Spectroscopy; Excited-state Dynamicsmentioning

confidence: 99%

“…The emission intensity has been normalized to the excitation intensity throughout this analysis. Taking the measured lifetimes for the 1.82 eV band, τ p ≈ 5 ms, and the 2.10 eV band, τ h ≈ 2.5 ms (figure 4), the absorption coefficients, k h (2.95 eV) = 2.7 cm −1 (figure 1) and k p (2.70 eV) = 10.8 cm −1 [46], and the emission spectra of figure 2, we finally get f = [MnCl 2 ] [NH 4 MnCl 3 ] = 0.003. This result illustrates the usefulness of correlation spectroscopy for unambiguously detecting MnCl 2 precipitates formed inside the NH 4 MnCl 3 crystal, and determining its concentration.…”

Section: Influence Of Mncl 2 Precipitates In Nh 4 Mnclmentioning

confidence: 99%

Intrinsic and extrinsic photoluminescence in the NH₄MnCl₃cubic perovskite: a spectroscopic study

Hernández¹,

Rodrı́guez

2003

J. Phys.: Condens. Matter

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This work investigates the photoluminescence (PL) properties of the cubic chloroperovskite NH 4 MnCl 3 . Like in most concentrated materials, the Mn 2+ PL which is located at 2.10 eV at T = 10 K strongly depends on the temperature. Optical absorption (OA), emission, and excitation spectroscopy, as well as lifetime measurements, performed on NH 4 MnCl 3 indicate that the PL is mainly intrinsic at T = 10 K and consists of a broad band located at 2.10 eV. Above this temperature, the PL gradually transforms to extrinsic PL due to exciton migration and subsequent trapping. Further temperature increase above 100 K yields transfer to killers of excitation which are responsible for the PL quenching, and hence the absence of PL at ambient conditions. The exciton traps are identified with perturbed Mn 2+ sites with the effective activation energy of 52 meV, whilst the activation energy for energy transfer is 47 meV. The existence of these traps has been directly revealed by time-resolved spectroscopy. The detected intrinsic and extrinsic PL bands are displaced by 6 meV, which coincides with the activation energy difference between pure Mn 2+ and trap Mn 2+ , as derived from temperature dependence studies of the lifetime τ (T ). Interestingly, a PL band at 1.82 eV is observed above 60 K. This band, which was initially associated with deeper excitation traps, actually corresponds to precipitates of MnCl 2 inside NH 4 MnCl 3 . The correlation analysis performed on NH 4 MnCl 3 using OA, PL, and lifetime data provides an estimate of the precipitate concentration of 0.3 mol %. The presence of two separated Mn 2+ PL bands at different temperatures is a rather common phenomenon in concentrated materials such as AMnX 3 (A = NH 4 , Rb; X = Cl, F), and has been interpreted in terms of exciton transfer to deeper traps. The present finding stresses the relevance of an adequate structural characterization in dealing with PL in concentrated materials.

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Low temperature optical study of manganous chloride

Abstract: Résumé. 2014

Cited by 23 publications

References 16 publications

Cooperative Near‐IR to Visible Photon Upconversion in Yb³⁺‐Doped MnCl₂ and MnBr₂: Comparison with a Series of Yb³⁺‐Doped Mn²⁺ Halides

Cooperative Near‐IR to Visible Photon Upconversion in Yb³⁺‐Doped MnCl₂ and MnBr₂: Comparison with a Series of Yb³⁺‐Doped Mn²⁺ Halides

Optical properties and ferromagnetic order in K2 CuF4

Intrinsic and extrinsic photoluminescence in the NH₄MnCl₃cubic perovskite: a spectroscopic study

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Low temperature optical study of manganous chloride

Abstract: Résumé. 2014

Cited by 23 publications

References 16 publications

Cooperative Near‐IR to Visible Photon Upconversion in Yb3+‐Doped MnCl2 and MnBr2: Comparison with a Series of Yb3+‐Doped Mn2+ Halides

Cooperative Near‐IR to Visible Photon Upconversion in Yb3+‐Doped MnCl2 and MnBr2: Comparison with a Series of Yb3+‐Doped Mn2+ Halides

Optical properties and ferromagnetic order in K2 CuF4

Intrinsic and extrinsic photoluminescence in the NH4MnCl3cubic perovskite: a spectroscopic study

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Cooperative Near‐IR to Visible Photon Upconversion in Yb³⁺‐Doped MnCl₂ and MnBr₂: Comparison with a Series of Yb³⁺‐Doped Mn²⁺ Halides

Cooperative Near‐IR to Visible Photon Upconversion in Yb³⁺‐Doped MnCl₂ and MnBr₂: Comparison with a Series of Yb³⁺‐Doped Mn²⁺ Halides

Intrinsic and extrinsic photoluminescence in the NH₄MnCl₃cubic perovskite: a spectroscopic study