Refractive index and optical absorption of bariumhexa-aluminate BaAl12O19

Enke, K.; Mateika, D.

doi:10.1007/bf00552127

Cited by 2 publications

(2 citation statements)

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“…The PBE0 (α = 0.31)-calculated band gaps of CAO, SAO, and BAO are 7.34, 7.52, and 7.57 eV, respectively. In contrast, the measured optical gap of BAO is 6.1 eV . The principal components of the conduction band (CB) and valence band (VB) are Al–s/O–s and O–p character, respectively.…”

Section: Resultsmentioning

confidence: 88%

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First-Principles and Experimental Study of Trace Impurities and Near-Infrared Emission in Alkaline Earth Hexaaluminates

et al. 2023

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First-principles calculations have been performed for bismuth and iron doped into the lattices BaAl12O19 (BAO) and CaAl12O19 (CAO). Experimental data for the optical spectra of CAO at temperatures down to 10 K are presented to support the calculation results. Even undoped samples of CAO exhibit luminescence bands due to trace impurities in the starting materials employed for synthesis. In particular, Mn4+ is ubiquitous. The near-infrared emission band at ∼810 nm in CAO is assigned to Fe3+ at the five-coordinated bipyramidal Al site. The near-ultraviolet emission of Bi-doped CAO is assigned to Bi3+ at the Ca site. The family MAO (M = Ba, Sr, and Ca) has been widely adopted for use as phosphors, when doped with transition metal or lanthanide ions, and the present study highlights the importance of reagent chemical purity in order to avoid energy losses and emission integrity via chemical impurity emissions. The emission wavelength of ∼810 nm presents interesting applications.

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Section: Resultsmentioning

confidence: 88%

“…In contrast, the measured optical gap of BAO is 6.1 eV. 25 The principal components of the conduction band (CB) and valence band (VB) are Al−s/ O−s and O−p character, respectively.…”

Section: ■ Methodsmentioning

confidence: 98%

First-Principles and Experimental Study of Trace Impurities and Near-Infrared Emission in Alkaline Earth Hexaaluminates

et al. 2023

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Colour centres in barium hexaaluminate (Phase I). Study by electron paramagnetic resonance, optical absorption, and thermally stimulated luminescence

Gourier

Gbehi

Visocekas³

et al. 1989

Physica Status Solidi (b)

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Colour centres produced by X-ray irradiation of barium hexaaluminate (phase I) with' p-alumina structure are studied by electron paramagnetic resonance, optical absorption, and thermally stimulated luminescence. It is shown that in addition to the F+ centres characteristic of p-alumina phases, this compound presents other colour centres such as F, 0-, and possibly V-type centres.The stability of these defects is investigated by means of thermal bleaching experiments and thermally stimulated luminescence. An alternative model to the generally accepted one is proposed, for the FC centres, together with a mechanism of defect formation.Les centres colo&s produits par irradiation X de l'hexaaluminate debarium (phase I) sont btudih par RPE, absorption UV-visible et luminescence stimulbe thermiquement. Nous montrons qu'en plus des centres F+ caractbristiques des phases de type alumine-p, d'autres centres sont produits tels que des centres F, 0-et peut etre des centres de type V. La stabilith de ces defauts est btudibe a l'aide d'expbriences de blanchiment thermique et de luminescence stimulbe thermiquement. Un autre modBle de centre F+ diff6rent de celui gbnhralement admis est proposb ainsi qu'un mhcanisme de formation des d6fauts.

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Refractive index and optical absorption of bariumhexa-aluminate BaAl12O19

Cited by 2 publications

References 3 publications

First-Principles and Experimental Study of Trace Impurities and Near-Infrared Emission in Alkaline Earth Hexaaluminates

First-Principles and Experimental Study of Trace Impurities and Near-Infrared Emission in Alkaline Earth Hexaaluminates

Colour centres in barium hexaaluminate (Phase I). Study by electron paramagnetic resonance, optical absorption, and thermally stimulated luminescence

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