Electronic structure and linear optical property of BaSi2N2O2 crystal

Wang, Lingli; Ni, Haiyong; Zhang, Liqun; Xiao, Fang

doi:10.1016/j.jallcom.2011.08.060

Cited by 7 publications

(7 citation statements)

References 21 publications

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“…Based on the experimental results, we can propose an energy level scheme for the afterglow emission in BaSi 2 O 2 N 2 :Eu 2+ . The band gap of BaSi 2 O 2 N 2 :Eu 2+ is 5.16 eV . The emission energies (2.5 eV) can be obtained from the elementary photoluminescence studies, and the trap energies (0.46 and 0.48 eV) are acquired from TL glow curves as described above.…”

Section: Resultsmentioning

confidence: 99%

“…The band gap of BaSi 2 O 2 N 2 :Eu 2+ is 5.16 eV. 28 The emission energies (2.5 eV) can be obtained from the elementary photoluminescence studies, and the trap energies (0.46 and 0.48 eV) are acquired from TL glow curves as described above. In the case of BaSi 2 O 2 N 2 :Eu 2+ , trap is most efficient using UV radiation (k < 325 nm) while it can also be filled upon excitation with near-UV to blue light (360 nm < k < 500 nm), when exciting into the higher 5d excited states (H-5d) and the lower 5d excited states (L-5d), respectively.…”

Section: Resultsmentioning

confidence: 99%

“…A larger value for S indicates a larger electron– lattice coupling. The Stokes shift (SS) is an importance feature of luminescence, and it can be obtained by taking SS as (2 Shw ) . According to Eq.…”

Section: Resultsmentioning

confidence: 99%

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Thermoluminescence and Temperature‐Dependent Afterglow Properties in BaSi₂O₂N₂:Eu²⁺

et al. 2013

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BaSi2O2N2:Eu2+ phosphor was successfully synthesized by using a simple solid‐state reaction method. Its properties were systematically investigated utilizing XRD, photoluminescence, excited state decay curve, afterglow emission spectra, and thermoluminescence (TL) glow curve. With increasing temperature, its emission intensity decreases with the broadening full widths at half maximum. Particularly, its temperature‐dependent afterglow emission spectra were investigated for the first time. Based on the information from TL glow curve, temperature‐dependent afterglow decay curves, and afterglow emission spectra, a model was constructed to explain the mechanism of afterglow. This study provides a new perspective to use the temperature‐dependent luminescence properties for studying the afterglow processes of long‐lasting phosphorescence phosphors.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Thermoluminescence and Temperature‐Dependent Afterglow Properties in BaSi₂O₂N₂:Eu²⁺

et al. 2013

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“…Furthermore, the observed narrow-band signature in SrMg 3 SiN 4 :Eu 2+ (fwhm of ∼43 nm) was also ascribed to the lone site occupied by the Eu emitter. , It is worth noting that the experimentally observed narrow-band emission is usually associated with a more symmetric coordination environment around the dopant, as seen in SrLiAl 3 N 4 , SrMg 3 SiN 4 , and BaSi 2 N 2 O 2 lattices with the cuboidal coordination. These symmetric coordination features can be identified by comparing the density of state of the nonequivalent nitrogen sites. ,, Conversely, nonequivalent substitution sites featuring an asymmetric coordination polyhedron are likely to generate broad-band emissions. The observation of two nonequivalent Y sites with different electronic structures in Y 3 Si 5 N 9 O phosphor is in accordance with the broadband emission recorded for the phosphors upon Ce 3+ doping .…”

Section: Design Criteria Of Lanthanide-activated Phosphorsmentioning

confidence: 99%

Lanthanide-Activated Phosphors Based on 4f-5d Optical Transitions: Theoretical and Experimental Aspects

et al. 2017

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The synthesis of lanthanide-activated phosphors is pertinent to many emerging applications, ranging from high-resolution luminescence imaging to next-generation volumetric full-color display. In particular, the optical processes governed by the 4f-5d transitions of divalent and trivalent lanthanides have been the key to enabling precisely tuned color emission. The fundamental importance of lanthanide-activated phosphors for the physical and biomedical sciences has led to rapid development of novel synthetic methodologies and relevant tools that allow for probing the dynamics of energy transfer processes. Here, we review recent progress in developing methods for preparing lanthanide-activated phosphors, especially those featuring 4f-5d optical transitions. Particular attention will be devoted to two widely studied dopants, Ce and Eu. The nature of the 4f-5d transition is examined by combining phenomenological theories with quantum mechanical calculations. An emphasis is placed on the correlation of host crystal structures with the 5d-4f luminescence characteristics of lanthanides, including quantum yield, emission color, decay rate, and thermal quenching behavior. Several parameters, namely Debye temperature and dielectric constant of the host crystal, geometrical structure of coordination polyhedron around the luminescent center, and the accurate energies of 4f and 5d levels, as well as the position of 4f and 5d levels relative to the valence and conduction bands of the hosts, are addressed as basic criteria for high-throughput computational design of lanthanide-activated phosphors.

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“…As a result of the larger chemical differences of the respective sites, the emission maxima and Stokes shifts are more distinct and thus lead to a relatively broad composite emission (FWHM ∼ 2,050-2,600 cm −1 ; refs 8,16,17,35). A comparison of the local Eu 2+ coordination geometry of SLA with Eu 2+ in BaSi 2 O 2 N 2 :Eu 2+ , a narrow-band green emitter (490 nm peak emission, FWHM ∼ 1,250 cm −1 ) with a surprisingly similar cuboidal coordination [36][37][38][39][40][41] , suggests that such a structural motif results in a small Stokes shift and thus in a narrow emission bandwidth, most likely due to hindered structure relaxation around the activator in its excited state 42 . Larger Stokes shifts and thus broader emission bands observed for Eu 2+ phosphors have been commonly associated with a more asymmetric dopantsite geometry 43 .…”

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confidence: 99%

Narrow-band red-emitting Sr[LiAl3N4]:Eu2+ as a next-generation LED-phosphor material

et al. 2014

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To facilitate the next generation of high-power white-light-emitting diodes (white LEDs), the discovery of more efficient red-emitting phosphor materials is essential. In this regard, the hardly explored compound class of nitridoaluminates affords a new material with superior luminescence properties. Doped with Eu(2+), Sr[LiAl3N4] emerged as a new high-performance narrow-band red-emitting phosphor material, which can efficiently be excited by GaN-based blue LEDs. Owing to the highly efficient red emission at λ(max) ~ 650 nm with a full-width at half-maximum of ~1,180 cm(-1) (~50 nm) that shows only very low thermal quenching (>95% relative to the quantum efficiency at 200 °C), a prototype phosphor-converted LED (pc-LED), employing Sr[LiAl3N4]:Eu(2+) as the red-emitting component, already shows an increase of 14% in luminous efficacy compared with a commercially available high colour rendering index (CRI) LED, together with an excellent colour rendition (R(a)8 = 91, R9 = 57). Therefore, we predict great potential for industrial applications in high-power white pc-LEDs.

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Electronic structure and linear optical property of BaSi2N2O2 crystal

Cited by 7 publications

References 21 publications

Thermoluminescence and Temperature‐Dependent Afterglow Properties in BaSi₂O₂N₂:Eu²⁺

Thermoluminescence and Temperature‐Dependent Afterglow Properties in BaSi₂O₂N₂:Eu²⁺

Lanthanide-Activated Phosphors Based on 4f-5d Optical Transitions: Theoretical and Experimental Aspects

Narrow-band red-emitting Sr[LiAl3N4]:Eu2+ as a next-generation LED-phosphor material

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Electronic structure and linear optical property of BaSi2N2O2 crystal

Cited by 7 publications

References 21 publications

Thermoluminescence and Temperature‐Dependent Afterglow Properties in BaSi2O2N2:Eu2+

Thermoluminescence and Temperature‐Dependent Afterglow Properties in BaSi2O2N2:Eu2+

Lanthanide-Activated Phosphors Based on 4f-5d Optical Transitions: Theoretical and Experimental Aspects

Narrow-band red-emitting Sr[LiAl3N4]:Eu2+ as a next-generation LED-phosphor material

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Thermoluminescence and Temperature‐Dependent Afterglow Properties in BaSi₂O₂N₂:Eu²⁺

Thermoluminescence and Temperature‐Dependent Afterglow Properties in BaSi₂O₂N₂:Eu²⁺