Luminescent spectroscopy of Eu2+ centers in CsBr:Eu single crystals at 10–550K

Zorenko, Yu.; Turchak, R.; Gryk, W.; Grinberg, M.

doi:10.1016/j.jlumin.2003.11.005

Journal of Luminescence

2004

DOI: 10.1016/j.jlumin.2003.11.005

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Luminescent spectroscopy of Eu2+ centers in CsBr:Eu single crystals at 10–550K

Yu. Zorenko

R. Turchak

W. Gryk

et al.

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Cited by 15 publications

(21 citation statements)

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“…At the same time, the intense luminescence band in the 520 nm region in the photoluminescence spectra of the annealed CsBr:Eu films indicates formation of CsEuBr 3 aggregate luminescence centers with emission in the band with λ max = 515-525 nm. Evidence in favor of formation of aggregate emission centers in the 520 nm region also comes from the dependence we found for the intensity of this luminescence on the film annealing temperature, matching the analogous dependence for CsBr:Eu single crystals [3].…”

supporting

confidence: 83%

“…Typically further increase in the film annealing temperature (T > 473 K) leads to decreased intensity of luminescence in both the indicated bands. We observed a quite similar dependence of the intensity of luminescence for the aggregate centers on the annealing temperature with heat treatment of CsBr:Eu crystals [3]. Consequently, we may conclude that in CsBr:Eu films grown from an aqueous alcoholic solution and subjected to heat treatment in the range T a = 443-463 K, at least two types of luminescence centers of different natures are formed, emitting in the green and orange regions of the spectrum respectively.…”

supporting

confidence: 70%

“…2) with the corresponding spectra for CsBr:Eu single crystals grown from the melt [3] suggests that they have both similarities and differences. In the photoluminescence spectra of freshly grown CsBr:Eu films, as in the photoluminescence spectra of CsBr:Eu single crystals, we observe bands in the 440 nm region, which indicates formation of isolated dipole centers Eu 2+ -V Cs [2,3]. At the same time, the intense luminescence band in the 520 nm region in the photoluminescence spectra of the annealed CsBr:Eu films indicates formation of CsEuBr 3 aggregate luminescence centers with emission in the band with λ max = 515-525 nm.…”

mentioning

confidence: 89%

“…In particular, in the photoluminescence spectra of CsBr:Eu films, we observe intense bands in the 470 nm and 600 nm regions which are missing in the photoluminescence spectra of CsBr:Eu single crystals. Note that in the CsBr:Eu films, degradation of the blue luminescence centers occurs at lower annealing temperatures (443 K) than in the single crystals (463 K) [3]. Such characteristic features of the photoluminescence spectra of the CsBr:Eu films and single crystals are probably due to the different structures of the defects formed during their crystallization.…”

mentioning

confidence: 93%

“…Comparison of the photoluminescence spectra of CsBr:Eu epitaxial structures obtained from an aqueous alcoholic solution and annealed in air at 423-483 K (Fig. 2) with the corresponding spectra for CsBr:Eu single crystals grown from the melt [3] suggests that they have both similarities and differences. In the photoluminescence spectra of freshly grown CsBr:Eu films, as in the photoluminescence spectra of CsBr:Eu single crystals, we observe bands in the 440 nm region, which indicates formation of isolated dipole centers Eu 2+ -V Cs [2,3].…”

mentioning

confidence: 98%

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Luminescence of CsBr:Eu films grown by liquid-phase epitaxy

et al. 2006

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By liquid-phase epitaxy from an aqueous alcoholic solution, we have obtained films of the well-known storage phospor CsBr:Eu, and we have studied their cathodoluminescence and photoluminescence (PL) spectra compared with the undoped CsBr films. We have established that the structure of the photoluminescence centers of the CsBr:Eu films when excited by laser radiation in the absorption band of the Eu 2+ ions (λ = 337 nm) includes Eu 2+ -V Cs isolated dipole centers and CsEuBr 3 aggregate centers, and also luminescence centers based on inclusions of hydroxyl group OH − with the corresponding emission bands in the 440 nm, 520 nm, and 600 nm regions. We have studied the dependence of the spectra and the intensity of the photoluminescence for CsBr:Eu films on annealing temperature in air at 423-483 K, compared with analogous dependences for CsBr:Eu single crystals obtained from the melt. We have shown that annealing the films at T = 423-463 K leads to rapid formation of CsEuBr3 aggregate luminescence centers, while for T > 473 K thermal degradation of these centers occurs. We conclude that the observed differences between the photoluminescence spectra of CsBr:Eu films and CsBr:Eu single crystals may be due to additional doping of the films with OH − ions.Introduction. Optically isotropic CsBr:Eu crystals are well-known storage phosphors for digital luminescence x-ray radiography [1]. At the moment, there have been studies of the characteristic features of crystallization and the luminescent properties of these phosphors in the form of single crystals grown from the melt [2, 3] and powders prepared by solid-phase synthesis [1,4], and also NIPs 1 (needle image plates), consisting of needle-shaped close-packed crystals obtained by thermal evaporation under vacuum [5]. At the same time, no information is available about the luminescent properties of CsBr:Eu phosphors grown from solutions.It has been established [1-4] that regardless of the chemical composition of europium impurity added to the mix (EuBr 3 ⋅8.9H 2 O, EuOBr, Eu 2 O 3 , Eu met ), incorporation of europium ions into CsBr crystals occurs in the divalent state. A characteristic feature of incorporation of Eu 2+ ions into CsBr crystals is also the fact that along with Eu 2+ -V Cs isolated dipole centers, for impurity concentrations 0.05%-0.50%, aggregate luminescence centers are also formed as CsEuBr 3 nanocrystals [2, 3]. When CsBr:Eu crystals are excited by UV light in the absorption bands of the Eu 2+ ions with λ max = 250 nm and 350 nm, the isolated dipole centers and the aggregate centers emit in the blue (λ max = 440 nm) and green (λ max = 520 nm) regions of the spectrum respectively. It has been shown [3] that aggregate centers are formed both during growth of the CsBr:Eu crystals and during their heat treatment at 443-473 K, which is accompanied by increased intensity of emission from the aggregate centers in the green region of the spectrum. At temperatures above 473 K, degradation of these luminescence centers occurs. Such characteristic features of th...

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supporting

confidence: 83%

supporting

confidence: 70%

mentioning

confidence: 89%

mentioning

confidence: 93%

mentioning

confidence: 98%

See 3 more Smart Citations

Luminescence of CsBr:Eu films grown by liquid-phase epitaxy

et al. 2006

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Bright Blue Light‐Emitting Doped Cesium Bromide Nanocrystals: Alternatives of Lead‐Free Perovskite Nanocrystals for White LEDs

Yang

Zhao

Liu

et al. 2019

Advanced Optical Materials

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A X B X t r r r r ), where r A , r B , and r X stand for the ionic radii of A, B, and X, respectively. For cubic or pseudo-cubic crystal structures, the ideal value for t is 1 or a wave between 0.813 and 1.107; tolerance values that deviate significantly from 1 lead to warping and destruction of the structure. [25,26] As reported by Shannon, [27] the ionic radii for Pb 2+ and Eu 2+ are 1.19 and 1.17 Å, respectively. The similarity in size between lead and europium suggests the potential to replace lead with the more environmental-friendly europium. In this vein, many CsEuX n (X = Cl, I) structures have been reported, including CsEuCl 3 , [28,29] CsEu 2 I 5 , [30] and CsEuI 3 . [30,31] Preparation Lead-based perovskite nanocrystals (NCs) are promising candidates for use in lighting and display applications; however, the toxicity of lead is one critical issue that needs to be solved for its commercialization. Consequently, less toxic tin and bismuth-based perovskite NCs have been developed, but these materials exhibit low photoluminescence quantum yields (PLQYs) and large full width at half maximum (FWHM) values. Due to their similarity in size for Eu 2+ and Pb 2+ , the more environmental-friendly europium shows the potential to replace lead. Herein, the synthesis of Eu 2+ doped CsBr NCs with an average size of 51.5 nm via a facile hot-injection method is reported. The prepared CsBr:Eu 2+ NCs exhibit an emission peak at 440 nm with an FWHM of 31 nm and PLQY up to 32.8%, which is persistent for at least 60 d. Moreover, the size and FWHM of CsBr:Eu 2+ NCs can be tuned to 18.9 and 29 nm, respectively, by co-doping of Ca 2+ ions into the NCs. It is also demonstrated that the prepared CsBr:Eu 2+ NCs can be employed as efficient color conversion materials for fabricating white light-emitting diodes.

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Luminescence and storage properties of CsBr:Cu and CsBr:CuO crystals

Zorenko

Turchak

Voznjak

et al. 2005

Physica Status Solidi (a)

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The absorption, photoluminescence, photo-stimulated luminescence (PSL) and emission decay of CsBr : Cu and CsBr : CuO crystals have been studied for estimation of the application possibilities of the compounds based on CsBr:Cu as a storage phosphors. The role of the Cu 2+ and Cu + ions in the PSL proceses of the CsBr : Cu compounds was considered. The comparison with the storage properties of the CsBr : Cu and CsBr : CuO crystals with the CsBr:Eu crystals have been provided.

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Luminescent spectroscopy of Eu2+ centers in CsBr:Eu single crystals at 10–550K

Cited by 15 publications

References 12 publications

Luminescence of CsBr:Eu films grown by liquid-phase epitaxy

Luminescence of CsBr:Eu films grown by liquid-phase epitaxy

Bright Blue Light‐Emitting Doped Cesium Bromide Nanocrystals: Alternatives of Lead‐Free Perovskite Nanocrystals for White LEDs

Luminescence and storage properties of CsBr:Cu and CsBr:CuO crystals

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