Bekker Tatyana B, Ryadun Alexey A, Rashchenko Sergey V, Davydov Alexey V, Baykalova Elena B, Solntsev Vladimir P
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia.
Department of Geology and Geophysics, Novosibirsk State University, 630090 Novosibirsk, Russia.
Materials (Basel). 2023 Jul 29;16(15):5344. doi: 10.3390/ma16155344.
The present study is aimed at unveiling the luminescence potential of BaSr(BO)F (BSBF) crystals doped with Eu, Tb, and Ce. Owing to the incongruent melting character of the phase, the NaF compound was used as a solvent for BSBF crystal growth. The structure of BSBF: Eu with EuO concentration of about 0.7(3) wt% was solved in the non-centrosymmetric point group 6. The presence of EuO in BSBF: Eu leads to a shift of the absorption edge from 225 nm to 320 nm. The photoluminescence properties of the BSBF: Ce, BSBF: Tb, BSBF: Eu, and BSBF: Eu, Tb, Ce crystals have been studied. The unusual feature of europium emission in BSBF is the intensively manifested D→F transition at about 574 nm, which is the strongest for BSBF: Eu at 370 nm excitation and for BSBF: Eu, Tb, Ce at 300 nm and 370 nm excitations. No evidence of Tb→Eu energy transfer was found for BSBF: Eu, Tb, Ce. The PL spectra of BSBF: Eu at 77 and 300 K are similar with CIE chromaticity coordinates of (0.617; 0.378) at 300 nm excitation and (0.634; 0.359) at 395 nm excitation and low correlated color temperature which implies application prospects in the field of lightning. Due to the high intensity of D→F Eu transition at 370 nm excitation, the BSBF: Eu emission is yellow-shifted.
本研究旨在揭示掺杂铕（Eu）、铽（Tb）和铈（Ce）的BaSr(BO)F（BSBF）晶体的发光潜力。由于该相的不一致熔融特性，NaF化合物被用作BSBF晶体生长的溶剂。在非中心对称点群6中解析了EuO浓度约为0.7(3) wt%的BSBF:Eu的结构。BSBF:Eu中EuO的存在导致吸收边从225 nm移至320 nm。研究了BSBF:Ce、BSBF:Tb、BSBF:Eu以及BSBF:Eu,Tb,Ce晶体的光致发光特性。BSBF中铕发射的不寻常特征是在约574 nm处强烈表现出的D→F跃迁，这对于370 nm激发的BSBF:Eu以及300 nm和370 nm激发的BSBF:Eu,Tb,Ce来说是最强的。对于BSBF:Eu,Tb,Ce，未发现Tb→Eu能量转移的证据。BSBF:Eu在77 K和300 K时的PL光谱相似，在300 nm激发下的CIE色度坐标为(0.617; 0.378)，在395 nm激发下为(0.634; 0.359)，且相关色温较低，这意味着在照明领域具有应用前景。由于在370 nm激发下D→F Eu跃迁强度高，BSBF:Eu发射发生黄移。
