Crystal chemistry of BaCa2Ln6O12 (Ln  In, Sc, Y, Dy, Ho, Er, Tm, Yb, Lu) and luminescence of europium- and terbium-activated BaCa2Y6O12

Hintzen, Htjm Bert; Hal, van Ham; Langereis, Cor G.; Denissen, Cjm Kees

doi:10.1016/0022-5088(89)90238-5

Cited by 7 publications

(4 citation statements)

References 27 publications

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“…The crystal structure of BaCa 2 Y 6 O 12 is very peculiar, offering different sites for the incorporation of luminescent ions. 9,17 Ba 2+ ions are randomly present inside the tunnel along c-axis. Then, the surrounding of Ba can take various symmetry in theory.…”

Section: Resultsmentioning

confidence: 99%

“…The additional intensity can be explained by increased mixing of the 4f levels with the lowlying charge-transfer band with opposite parity. 17 A short distance between europium and the surrounding anions has been reported to cause a high 5 D 0 → 7 F 0 transition energy. 17 Hence, the low energy of the 5 D 0 → 7 F 0 transition for the Eu Ca 3+ ions can be understood as a consequence of the fairly long Eu−O distance (average Ca−O distance:0.275 nm, average Y−O distance: 0.228 nm).…”

Section: Resultsmentioning

confidence: 99%

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Structure and Luminescence Properties of Single-Phased BaCa₂Y₆O₁₂:Eu³⁺, Dy³⁺

Wang

Liu

et al. 2014

ECS J. Solid State Sci. Technol.

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Single-phased Eu3+/Dy3+ activated BaCa2Y6O12 photoluminescence materials have been prepared via solid state reaction and their crystal structures and luminescent properties were investigated in detail. For prepared BaCa2Y6O12:Eu3+, the Eu3+ ion is identified occupying two different crystallographic sites, which can be excited selectively with different excitation wavelengths. Energy transfers between Dy3+ and from Dy3+ to Eu3+ are investigated. The overall emission color can be tuned from yellowish red to white light by adjusting the relative content between Eu3+ and Dy3+. Furthermore, the luminescence intensity of BaCa2Y6O12:0.03Eu3+, 0.09Dy3+ is 91% of the initial value at 623 K, which shows excellent thermal stability.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Structure and Luminescence Properties of Single-Phased BaCa₂Y₆O₁₂:Eu³⁺, Dy³⁺

Wang

Liu

et al. 2014

ECS J. Solid State Sci. Technol.

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“…In 1989, the quantum efficiency of Eu

^{3 +}

in BaCa

_{2}

_{6}

_{12}

was found to be up to 25% [53]. The quantum efficiency of nanocrystalline powder of Lu

_{2}

_{3}

:Eu

^{3 +}

reaches 90% [54] and that of bulk Y

_{2}

_{3}

:Eu

^{3 +}

of 92% [55].…”

Section: The Lanthanide Ions Eu2+/eu3+ and Their Optical Propertiesmentioning

confidence: 99%

“…At the site with the lower shift, Eu

^{3 +}

replaces Y

^{3 +}

and for the higher Eu

^{2 +}

replaces Ca

^{2 +}

. The Y

^{3 +}

site is preferred with respect to the Ca

^{2 +}

site by about a factor of 2 [53]. …”

Section: Materials Overviewmentioning

confidence: 99%

Characterization of Luminescent Materials with 151Eu Mössbauer Spectroscopy

Steudel

Johnson

et al. 2018

Materials

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The application of Mössbauer spectroscopy to luminescent materials is described. Many solids doped with europium are luminescent, i.e., when irradiated with light they emit light of a longer wavelength. These materials therefore have practical applications in tuning the light output of devices like light emitting diodes. The optical properties are very different for the two possible valence states Eu2+ and Eu3+, the former producing ultraviolet/visible light that shifts from violet to red depending on the host and the latter red light, so it is important to have a knowledge of their behavior in a sample environment. Photoluminescence spectra cannot give a quantitative analysis of Eu2+ and Eu3+ ions. Mössbauer spectroscopy, however, is more powerful and gives a separate spectrum for each oxidation state enabling the relative amount present to be estimated. The oxidation state can be identified from its isomer shift which is between −12 and −15 mm/s for Eu2+ compared to around 0 mm/s for Eu3+. Furthermore, within each oxidation state, there are changes depending on the ligands attached to the europium: the shift is more positive for increased covalency of the bonding ligand X, or Eu concentration, and decreases for increasing Eu–X bond length.

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