Site Occupation of Eu2+ in Ba2-xSrxSiO4 (x=0-1.9) and Origin of Improved Luminescence Thermal Stability in the Intermediate Composition

doi:10.1021/acs.inorgchem.8b00773

	Site Occupation of Eu2+ in Ba2-xSrxSiO4 (x=0-1.9) and Origin of Improved Luminescence Thermal Stability in the Intermediate Composition
	Lin, LT; Ning, LX; Chen, J; Huang, YC; Peng, MY; Jiang, CY; Zhou, RF; Huang, Y; Tao, Y; Liang, HB
刊名	INORGANIC CHEMISTRY
	2018
卷号	57 期号:12 页码:7090-7096
ISSN号	0020-1669
DOI	10.1021/acs.inorgchem.8b00773
文献子类	Article
英文摘要	Knowledge of site occupation of activators in phosphors is of essential importance for understanding and tailoring their luminescence properties by modifying the host composition. Relative site preference of Eu2+ for the two distinct types of alkaline earth (AE) sites in Ba1.9995-xSrxEu0.0005SiO4 (x = 0-1.9) is investigated based on photoluminescence measurements at low temperature. We found that Eu2+ prefers to be at the 9-coordinated AE2 site at x = 0, 0.5, and 1.0, while at x = 1.5 and 1.9, it also occupies the 10-coordinated AE1 site with comparable preference, which is verified by density functional theory (DFT) calculations. Moreover, by combining low-temperature measurements of the heat capacity, the host band gap, and the Eu2+ 4f(7), ground level position, the improved thermal stability of Eu2+ luminescence in the intermediate composition (x = 1.0) is interpreted as due to an enlarged energy gap between the emitting 5d level and the bottom of the host conduction band (CB), which results in a decreased nonradiative probability of thermal ionization of the 5d electron into the host CB. Radioluminescence properties of the samples under X-ray excitation are finally evaluated, suggesting a great potential scintillator application of the compound in the intermediate composition.
电子版国际标准刊号	1520-510X
WOS关键词	AUGMENTED-WAVE METHOD ; CHARGE-TRANSFER ; ENHANCED PHOTOLUMINESCENCE ; STRUCTURAL RIGIDITY ; ENERGY-TRANSFER ; AB-INITIO ; PHOSPHORS ; OXIDE ; CE3+
WOS研究方向	Chemistry
语种	英语
WOS记录号	WOS:000436023800038
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/286077]
专题	高能物理研究所_多学科研究中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Lin, LT,Ning, LX,Chen, J,et al. Site Occupation of Eu2+ in Ba2-xSrxSiO4 (x=0-1.9) and Origin of Improved Luminescence Thermal Stability in the Intermediate Composition[J]. INORGANIC CHEMISTRY,2018,57(12):7090-7096.
APA	Lin, LT.,Ning, LX.,Chen, J.,Huang, YC.,Peng, MY.,...&陶冶.(2018).Site Occupation of Eu2+ in Ba2-xSrxSiO4 (x=0-1.9) and Origin of Improved Luminescence Thermal Stability in the Intermediate Composition.INORGANIC CHEMISTRY,57(12),7090-7096.
MLA	Lin, LT,et al."Site Occupation of Eu2+ in Ba2-xSrxSiO4 (x=0-1.9) and Origin of Improved Luminescence Thermal Stability in the Intermediate Composition".INORGANIC CHEMISTRY 57.12(2018):7090-7096.