Synthesis and Crystal Structure of LiLaP4O12

Boujelbene, Mohamed; Mhiri, Tahar

doi:10.2116/xraystruct.27.21

Cited by 3 publications

(2 citation statements)

References 7 publications

(7 reference statements)

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“…To explain this fact, the presence of two crystallographic positions for a Bi 3+ ion in the phosphate host was suggested. However, a later work [247] on the single crystal X-ray diffraction excluded such possibility.…”

Section: Appendix Amentioning

confidence: 99%

Luminescence Spectroscopy and Origin of Luminescence Centers in Bi-Doped Materials

et al. 2020

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Bi-doped compounds recently became the subject of an extensive research due to their possible applications as scintillator and phosphor materials. The oxides co-doped with Bi3+ and trivalent rare-earth ions were proposed as prospective phosphors for white light-emitting diodes and quantum cutting down-converting materials applicable for enhancement of silicon solar cells. Luminescence characteristics of different Bi3+-doped materials were found to be strongly different and ascribed to electronic transitions from the excited levels of a Bi3+ ion to its ground state, charge-transfer transitions, Bi3+ dimers or clusters, radiative decay of Bi3+-related localized or trapped excitons, etc. In this review, we compare the characteristics of the Bi3+-related luminescence in various compounds; discuss the possible origin of the corresponding luminescence centers as well as the processes resulting in their luminescence; consider the phenomenological models proposed to describe the excited-state dynamics of the Bi3+-related centers and determine the structure and parameters of their relaxed excited states; address an influence of different interactions (e.g., spin-orbit, electron-phonon, hyperfine) as well as the Bi3+ ion charge and volume compensating defects on the luminescence characteristics. The Bi-related luminescence arising from lower charge states (namely, Bi2+, Bi+, Bi0) is also reviewed.

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Section: Appendix Amentioning

confidence: 99%

Luminescence Spectroscopy and Origin of Luminescence Centers in Bi-Doped Materials

et al. 2020

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“…Earlier, in the example of LiLa 0.9−- x Nd 0.1 Yb x P 4 O 12 , it was shown that the optimal ratio between neodymium and ytterbium ions in luminescent thermometers is Nd 3+ : Yb 3+ = 1 : 5, 38 which we selected as the starting point for optimization. To select the gadolinium fraction, we compared the crystallographic data of Eu(ant) 3 (Eu⋯Eu distance 3.714 Å) and LiLaP 4 O 12 39 (La⋯La distance 6.413 Å). Despite the fact that the volume concentrations of lanthanide ions for the phosphate and anthracenate structures differed by almost 4 times (225 Å 3 and 846.3 Å 3 , respectively), the smallest distances between the lanthanides in the anthracenate structure turned out to be even less than in the case of phosphate.…”

Section: Resultsmentioning

confidence: 99%