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Flux Synthesis, Monoclinic Structure, and Luminescence of Europium(III)‐Doped K 3 La(PO 4 ) 2
Author(s) -
Terebilenko Kateryna V.,
Kyselov Dmitryi V.,
Baumer Vyacheslav N.,
Slobodyanik Mykola S.,
Petrenko Olga V.,
Khomenko Olena V.,
Dotsenko Volodymir P.
Publication year - 2018
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201800158
Subject(s) - luminescence , monoclinic crystal system , molybdate , phosphor , europium , lanthanum , flux method , photoluminescence , analytical chemistry (journal) , doping , crystal structure , solid solution , potassium , chemistry , crystallography , emission spectrum , ion , cerium , quenching (fluorescence) , single crystal , materials science , spectral line , inorganic chemistry , fluorescence , optics , physics , optoelectronics , organic chemistry , chromatography , astronomy
Single crystals of potassium lanthanum orthophosphate are prepared from high‐temperature melts containing potassium molybdate as a flux and structurally investigated by single‐crystal X‐ray diffraction. The framework is shown to be constructed from isolated LaO 7 monocapped prisms and PO 4 tetrahedra through corner‐ and edge‐sharing giving rise to 2D sheets with composition [La(PO 4 ) 2 ] 3− . Three types of potassium cations reside between these layers. For the solid solutions K 3 La 1− x Eu x (PO 4 ) 2 ( x = 0.1–0.9) prepared by the solid‐state route, the excitation and emission luminescence spectra are studied at room temperature. The emission spectra exhibit strong reddish performance, which is due to the 5 D 0 → 7 F J transitions of Eu 3+ ions. The correlation between the structure and the photoluminescent properties of the phosphors is studied. The energy transfer and concentration quenching of the phosphors are discussed. Solid solutions K 3 La 1− x Eu x (PO 4 ) 2 have a potential application for white‐light‐emitting diodes.