First principles investigation of host excitation of LaPO4, La2O3 and AlPO4

Mishra, K. C.; Osterloh, I.; Anton, Herbert; Hannebauer, Bernd; Schmidt, Peter; Johnson, K. H.

doi:10.1016/s0022-2313(96)00324-9

Cited by 21 publications

(14 citation statements)

References 1 publication

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“…It should be noticed that the SO for LaPO 4 (SO 2 eV) has been chosen in such a way to reproduce its experimental optical gap of 7.8 eV [29]. Calculated band structure of LaPO 4 is not given here but compares well with the one determined by Mishra et al [30].…”

Section: Resultsmentioning

confidence: 91%

Prediction of the transparency in the visible range of x-ray absorbing nanocomposites built upon the assembly of LaF_3 or LaPO_4 nanoparticles with poly(methyl methacrylate)

Haber¹,

Rocquefelte²,

Amrani³

et al. 2012

J. Opt. Soc. Am. B

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A theoretical multiscale approach combining density functional theory and four-flux calculations based on the radiative transfer theory is used to prospect the optical properties of nanocomposite materials composed of inorganic nanoparticles of lanthanum-containing compounds (LaF 3 or LaPO 4 ) embedded in Poly(methyl methacrylate) (PMMA). This theoretical investigation shows that a potential route to produce lead-free x-ray shielding screens with high transparency in the visible range (>70% of incident light) may consist in incorporating colorless LaF 3 or LaPO 4 spherical particles with a diameter lower than 6 nm in a PMMA panel from a minimum thickness of 3 mm with a volumetric fraction of at least 10%. In terms of x-ray attenuation, this would lead to lead equivalency of 0.1 mm (lead foil).

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Section: Resultsmentioning

confidence: 91%

Prediction of the transparency in the visible range of x-ray absorbing nanocomposites built upon the assembly of LaF_3 or LaPO_4 nanoparticles with poly(methyl methacrylate)

Haber¹,

Rocquefelte²,

Amrani³

et al. 2012

J. Opt. Soc. Am. B

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“…A high-energy band at 169 nm is observed in the excitation spectra of Eu 3+ and Gd 3+ emission. This should be attributed to the excitation of the host matrix in the absorption region of the PO 4 groups [12,15,16].…”

Section: Resultsmentioning

confidence: 99%

“…Third, since the energy transfer is a phonon-assisted process, hosts with a high Debye frequency are preferable. Analysis of published data shows that phosphates with a PO 4 group, which absorb photons of energy 47 eV [12] and exhibit a high frequency of internal vibration modes [10], satisfy these conditions. This motivated the choice of the barium rare-earth orthophosphate Ba 3 Ln(PO 4 ) 3 as host.…”

Section: Introductionmentioning

confidence: 99%

VUV sensitisation of Eu3+ emission by Tb3+ in Ba3Tb(PO4)3–Eu

Mikhailik

Kraus

2009

Journal of Luminescence

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“…Recent studies [9][10][11] have found that RE 3+ -activated phosphates could exhibit excellent luminescence properties due to the absorption of PO 4 3− in VUV region [12]. It was reported that Ca 10 K(PO 4 ) 7 (CKP) compound is isostructural toˇ-Ca 3 (PO 4 ) 2 , which have a polar whitlockite-type crystal structure [13].…”

Section: Introductionmentioning

confidence: 99%