Vibrational structure in the luminescence spectra of ions in solids

Blasse, G.

doi:10.1007/3-540-58155-3_1

Cited by 10 publications

(5 citation statements)

References 65 publications

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“…24 In this dilute limit, the vibronic structure was attributed to a pseudo-secondorder Jahn−Teller distortion, where the Bi ions shifted away from the center of the regular octahedra to create one short and one long axial bond length. 25 These previous reports found several sharp emission lines on top of a broader band, much like in the spectra seen here for Cs 3 Bi 2 Br 9 , albeit only at liquidhelium temperatures.…”

supporting

confidence: 87%

“…Similar luminescent properties have been reported when small concentrations of absorbing ions containing a pair of s 2 electrons (such as Bi 3+ , Sb 3+ , or Pb 2+ ) were substituted into nonabsorbing matrixes like Cs 2 NaYCl 6 . In this dilute limit, the vibronic structure was attributed to a pseudo-second-order Jahn–Teller distortion, where the Bi ions shifted away from the center of the regular octahedra to create one short and one long axial bond length . These previous reports found several sharp emission lines on top of a broader band, much like in the spectra seen here for Cs 3 Bi 2 Br 9 , albeit only at liquid-helium temperatures.…”

supporting

confidence: 76%

“…It, therefore, appears that optical excitation of the films may trigger a similar Jahn−Teller distortion of the BiBr 6 octahedra in the same way as was previously observed for isolated Bi ions. 25 At the q points L and M, one of the previously degenerate E g imaginary modes remains imaginary, but with lower B g symmetry, corresponding to a rotation of the BiBr 6 octahedra about the [211̅ ] direction at M. At L, the phase of this rotation alternates between layers.…”

mentioning

confidence: 95%

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Vibronic Structure in Room Temperature Photoluminescence of the Halide Perovskite Cs₃Bi₂Br₉

et al. 2016

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We report a study on the optical properties of the layered polymorph of vacancy-ordered triple perovskite CsBiBr. The electronic structure, determined from density functional theory calculations, shows the top of the valence band and bottom of the conduction band minima are, unusually, dominated by Bi s and p states, respectively. This produces a sharp exciton peak in the absorption spectra with a binding energy that was approximated to be 940 meV, which is substantially stronger than values found in other halide perovskites and, instead, more closely reflects values seen in alkali halide crystals. This large binding energy is indicative of a strongly localized character and results in a highly structured emission at room temperature as the exciton couples to vibrations in the lattice.

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supporting

confidence: 87%

supporting

confidence: 76%

mentioning

confidence: 95%

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Vibronic Structure in Room Temperature Photoluminescence of the Halide Perovskite Cs₃Bi₂Br₉

et al. 2016

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“…As shown in the figure insets, of these crystals only CaMoO 4 shows noticeable emission at room temperature, the other two start to emit light at 30 (MgMoO 4 ) and 250 K (CdMoO 4 ). The emission spectra have composite structure and by analogy with the tungstate crystals the high-energy band is used to be interpreted as the radiative recombination of the electron-hole pairs localised at the MoO 4 2group [9]. The low-energy part of the spectrum is tentatively assigned to defect emission.…”

Section: Research Lettermentioning

confidence: 99%

Studies of electronic excitations in MgMoO₄, CaMoO₄ and CdMoO₄ crystals using VUV synchrotron radiation

Mikhailik

Kraus

Wahl

et al. 2005

Physica Status Solidi (b)

103

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The search for rare events is an important topic on the agenda of the astro-particle physics community. Finding neutrinoless double-beta decay and the detection of weakly interacting massive particles (WIMP) possibliy constituting the galactic Dark Matter requires the capability of discriminating between rare interactions with nuclei and radioactive backgrounds with electrons. Research and development are underway for the implementation of new instrumentation in low-background particle physics experiments. Event-by-event discrimination through measuring a combination of phonon and scintillation response from cryogenic phonon-scintillation detectors (CPSD) is considered to be a particularly promising technique for this purpose because of its ability to achieve active background rejection for a range of different materials [1]. These detectors are likely to play an important role in experiments searching for rare events, such as interactions with WIMPs [2], double beta decay [3] and radioactive decay of very long-living isotopes [4].There is strong interest in additional materials capable of meeting the stringent requirements of low-temperature and low-background experiments. A high light yield at low temperatures is a key criterion for CPSDs and tungstates are an obvious scintillator choice [1,2,4]. Interest is now turning to materials in the molybdate family. As for the optical properties, to the best of our knowledge only UVexcited luminescence and reflectivity of CaMoO 4 have been studied [5,6]. Therefore investigation of low-temperature luminescence properties of these materials is an important task.We carried out a series of optical measurements of three crystals, MgMoO 4 CaMoO 4 and CdMoO 4 . In this paper we present the results of measurements on reflection, luminescence and luminescence excitation spectra of the crystals, made over a wide temperature range (8 -295 K), using monochromatic VUV synchrotron radiation in the energy range 4 -25 eV.Single crystals have been grown by the Czochralski technique. The sample of MgMoO 4 was cleaved from a larger ingot, while CaMoO 4 and CdMoO 4 were polished to the optical quality. The absorption edges of the crystals at 300 K are estimated to be 3.8, 3.7 and 3.25 eV respectively.The luminescence characterisation of the crystals was carried out using the spectroscopic instrumentation of the SUPERLUMI station at HASYLAB. The 2-m primary vacuum monochromator equipped with an Al-coated gratReflection, emission and luminescence spectra of Czochralski grown molybdate crystals, i.e. MgMoO 4 , CaMoO 4 and CdMoO 4 have been investigated over a 8-295 K temperature range using VUV synchrotron radiation. Preliminary interpretation of the spectroscopic properties has been carried out on the basis of present knowledge of the electronic structure and emission properties of these materials. The results of this study support the conclusion that molybdate crystals have good prospect for application in the search for rare events as cryogenic phonon-scintillation detectors.

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“…However, in the present case, the emission band of the self‐luminescence of “WO 2 ” group is structureless. The large Stokes shift (~20 400 cm −1 ) in NWOF, arising from the extensive electronic redistribution between O 2− and W 6+ after charge transfer, should be responsible for the absence of vibrational structure . Moreover, the degeneracy of the electronic levels may be lifted in the highly distorted [WO 2 F 4 ] 2− octahedron, which also results in the disappearance of the fine structure in the PL spectrum, as proposed by Srivastava et al…”

Section: Resultsmentioning

confidence: 79%

Host sensitization of Mn⁴⁺ in self‐activated Na₂WO₂F₄:Mn⁴⁺

Lin

Gao

et al. 2018

J Am Ceram Soc

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Self-activated compound serving as host sensitizer for trivalent rare-earth ions has been intensively studied, but only in more recent years did it extend to non-rareearth ions. In the present work, it is demonstrated for the first time that the parity-forbidden Mn 4+ red emission can be effectively enhanced by utilizing the strong parity-allowed absorption of O 2À -W 6+ charge transfer band and the energy transfer from "WO 2 " groups to Mn 4+ ions. Hopefully, the presently studied selfactivated Na 2 WO 2 F 4 can be developed as stable color converter for field-emission displays.

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Vibrational structure in the luminescence spectra of ions in solids

Cited by 10 publications

References 65 publications

Vibronic Structure in Room Temperature Photoluminescence of the Halide Perovskite Cs₃Bi₂Br₉

Vibronic Structure in Room Temperature Photoluminescence of the Halide Perovskite Cs₃Bi₂Br₉

Studies of electronic excitations in MgMoO₄, CaMoO₄ and CdMoO₄ crystals using VUV synchrotron radiation

Host sensitization of Mn⁴⁺ in self‐activated Na₂WO₂F₄:Mn⁴⁺

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Vibrational structure in the luminescence spectra of ions in solids

Cited by 10 publications

References 65 publications

Vibronic Structure in Room Temperature Photoluminescence of the Halide Perovskite Cs3Bi2Br9

Vibronic Structure in Room Temperature Photoluminescence of the Halide Perovskite Cs3Bi2Br9

Studies of electronic excitations in MgMoO4, CaMoO4 and CdMoO4 crystals using VUV synchrotron radiation

Host sensitization of Mn4+ in self‐activated Na2WO2F4:Mn4+

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Vibronic Structure in Room Temperature Photoluminescence of the Halide Perovskite Cs₃Bi₂Br₉

Vibronic Structure in Room Temperature Photoluminescence of the Halide Perovskite Cs₃Bi₂Br₉

Studies of electronic excitations in MgMoO₄, CaMoO₄ and CdMoO₄ crystals using VUV synchrotron radiation

Host sensitization of Mn⁴⁺ in self‐activated Na₂WO₂F₄:Mn⁴⁺