Crystal growth and scintillation properties of CsCaBr3:Eu2+(CsCa1−xEuxBr3, 0≤x≤0.08)

Grippa, A.Yu.; Rebrova, N.V.; Gorbacheva, T.E.; Pedash, V.Yu.; Kosinov, N. N.; Cherginets, V.L.; Тарасов, В. А.; Tarasenko, О.А.; Lopin, A. V.

doi:10.1016/j.jcrysgro.2013.02.020

Cited by 38 publications

(13 citation statements)

References 15 publications

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“…However, a thermoluminescence study revealed that co‐doping of Ca 2+ ions into CsBr:Eu 2+ NCs can decrease thermally stimulated luminescence FWHM of CsBr:Eu 2+ NCs . The PL FWHM of Ca 2+ incorporated CaBr:Eu 2+ and CsCa 1− x Eu x Br 3 crystals is in the range of 16–18 nm, much narrower than what is observed with CsBr:Eu 2+ crystals. Applying these concepts to our study, we introduced Ca 2+ ions into the CsBr:Eu 2+ NCs aiming to improve their color purity (see the Experimental Section for details).…”

Section: Resultsmentioning

confidence: 89%

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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Section: Resultsmentioning

confidence: 89%

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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“…Eu 2 þ luminescence has also very recently been investigated in the perovskite CsCaBr 3 :Eu 2 þ , serving as scintillator crystal 11 . Indeed, our results may be most readily compared with this compound as the structures are closely related.…”

Section: Resultsmentioning

confidence: 99%

Structure and properties of complex hydride perovskite materials

et al. 2014

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Perovskite materials host an incredible variety of functionalities. Although the lightest element, hydrogen, is rarely encountered in oxide perovskite lattices, it was recently observed as the hydride anion H À , substituting for the oxide anion in BaTiO 3 . Here we present a series of 30 new complex hydride perovskite-type materials, based on the non-spherical tetrahydroborate anion BH 4 À and new synthesis protocols involving rare-earth elements. Photophysical, electronic and hydrogen storage properties are discussed, along with counterintuitive trends in structural behaviour. The electronic structure is investigated theoretically with density functional theory solid-state calculations. BH 4 -specific anion dynamics are introduced to perovskites, mediating mechanisms that freeze lattice instabilities and generate supercells of up to 16 Â the unit cell volume in AB(BH 4 ) 3 . In this view, homopolar hydridic di-hydrogen contacts arise as a potential tool with which to tailor crystal symmetries, thus merging concepts of molecular chemistry with ceramic-like host lattices. Furthermore, anion mixing BH 4 À 2X À (X À ¼ Cl À , Br À , I À ) provides a link to the known ABX 3 halides.

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“…There are several studies devoted to CsSr 1‐x Eu x X 3 and CsCa 1‐x Eu x X 3 (X = Cl, Br, I). The reported light yields are 18,000 ph/MeV for CsCa 0.9 Eu 0.1 Cl 3 , 28,000 ph/MeV for CsCa 0.92 Eu 0.08 Br 3 and 38,500 ph/MeV for CsCa 0.97 Eu 0.03 I 3 . Their energy resolutions at 662 keV are rather close 8.9%, 9.3% and 8%, respectively.…”

Section: Introductionmentioning

confidence: 80%

“…Before the crystal growth KBr and RbBr were dried at 200°C in a dynamic vacuum (5‐10 Pa) in order to remove any traces of moisture. The routine of EuBr 2 and CaBr 2 synthesis are presented in detail elsewhere ; due to the hygroscopic nature of these ingredients all steps of the charge preparation and the crystal treatment were performed in a glove box. Different stoichiometric mixtures of RbCa 1‐x Eu x Br 3 (y = 0.005, 0.03, 0.05, 0.08) and KCa 0.995 Eu 0.005 Br 3 were prepared.…”

Section: Methodsmentioning

confidence: 99%

Scintillation properties of crystals based on ternary bromides of calcium and alkali metals activated with europium

Rebrova

Grippa

Pushak

et al. 2017

Crystal Research and Technology

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Single crystals of new scintillation materials ACaBr 3 :Eu 2+ (A = K, Rb) were grown using the Bridgman-Stockbarger method. The luminescence spectra of RbCa 1-x Eu x Br 3 crystals include a single band with a maximum which position shifts from 433 to 443 nm with the increase of mole fraction of Eu 2+ from 0.005 to 0.08. The decay of the scintillation pulse can be described using single component and the decay time rises towards concentration of Eu 2+ in crystals from 2.70 μs (x = 0.03) to 3.14 μs (x = 0.05). The relative light yield achieves 77 per cent vs. NaI:Tl for RbCa 0.92 Eu 0.08 Cl 3 sample and the energy resolution is 8.2%. Comparing with the K-based analogs RbCa 1-x Eu x Br 3 materials are more stable and they are considerably brighter scintillators than CsCa 1-x Eu x Br 3 .

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Crystal growth and scintillation properties of CsCaBr3:Eu2+(CsCa1−xEuxBr3, 0≤x≤0.08)

Cited by 38 publications

References 15 publications

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

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

Structure and properties of complex hydride perovskite materials

Scintillation properties of crystals based on ternary bromides of calcium and alkali metals activated with europium

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