Anomalous oxidation state of europium in the Sr3(PO4)2-type phosphors doped with alkaline cations

被引：5
作者：
Deyneko, Dina, V [1 ,2 ]
Spassky, Dmitry A. [3 ,4 ]
Antropov, Andrey, V [1 ]
Ril, Aleksey I. [5 ]
Baryshnikova, Oksana, V [1 ]
Pavlova, Erzhena T. [6 ]
Lazoryak, Bogdan I. [1 ]
机构：
[1] Lomonosov Moscow State Univ, Dept Chem, Moscow 119991, Russia
[2] Russian Acad Sci, Kola Sci Ctr, Lab Arctic Mineral & Mat Sci, 14 Fersman str, Apatity 184209, Russia
[3] Univ Tartu, Inst Phys, W Ostwald Str 1, EE-50411 Tartu, Estonia
[4] Lomonosov Moscow State Univ, Skobeltsyn Inst Nucl Phys, Leninskie Gory 1, Moscow 119991, Russia
[5] Russian Acad Sci, Kurnakov Inst Gen & Inorgan Chem IG, Moscow 119991, Russia
[6] Buryat State Univ, Smolin St 24a, Ulan Ude 670000, Russia
来源：
MATERIALS RESEARCH BULLETIN | 2023年 / 165卷
基金：
俄罗斯科学基金会;
关键词：
LUMINESCENCE PROPERTIES; PHOTOLUMINESCENCE PROPERTIES; EXCITATION DENSITY; ABNORMAL REDUCTION; CRYSTAL-STRUCTURE; ENERGY-TRANSFER; VALENCE-CHANGE; RED PHOSPHORS; SITE SYMMETRY; EU3+;
D O I：
10.1016/j.materresbull.2023.112296
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A series of new phosphors Sr2.98Eu0.01M0.01(PO4)(2) (SEMP), M = Li+, Na+, K+ have been synthesized by high temperature solid state reaction. Powder X-ray diffraction study reveals that SEMP samples are isostructural to palmierite-type Sr-3(PO4)(2) phosphate. The anomalous reduction Eu3+ -> Eu2+ in nonreduction media in Sr-3(PO4)(2) host has been reported for the first time. The blue emission from Eu2+ (similar to 425 nm) corresponding to the 4f(6)5d(1)-> 4f(7)(S-8(7/2)) transitions and red emission from Eu3+ (550-750 nm), corresponding to the 4f-4f transitions D-5(0) -> F-7(J) (J = 0-4) were observed. The highest Eu3+ luminescence intensity was observed for Li(+-)doped host both at 296 K and at 10 K. The results show that the synthesized samples with tunable blue/red-orange emission can be considered for thermal sensing application.
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页数：11
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