Premium
Structural Evolution and Effect of the Neighboring Cation on the Photoluminescence of Sr(LiAl 3 ) 1− x (SiMg 3 ) x N 4 :Eu 2+ Phosphors
Author(s) -
Fang MuHuai,
Mahlik Sebastian,
Lazarowska Agata,
Grinberg Marek,
Molokeev Maxim S.,
Sheu HwoShuenn,
Lee JyhFu,
Liu RuShi
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201903178
Subject(s) - photoluminescence , phosphor , spectroscopy , europium , luminescence , strontium , materials science , ion , absorption (acoustics) , crystallography , analytical chemistry (journal) , chemistry , physics , optoelectronics , organic chemistry , chromatography , quantum mechanics , composite material
In this study, a series of Sr(LiAl 3 ) 1− x (SiMg 3 ) x N 4 :Eu 2+ (SLA‐SSM) phosphors were synthesized by a solid‐solution process. The emission peak maxima of SLA‐SSM range from 615 nm to 680 nm, which indicates structural differences in these materials. 7 Li solid‐state NMR spectroscopy was utilized to distinguish between the Li(1)N 4 and Li(2)N 4 tetrahedra in SLA‐SSM. Differences in the coordination environments of the two Sr sites were found which explain the unexpected luminescent properties. Three discernible morphologies were detected by scanning electron microscopy. Temperature‐dependent photoluminescence and decay times were used to understand the diverse environments of europium ions in the two strontium sites Sr1 and Sr2, which also support the NMR analysis. Moreover, X‐ray absorption near‐edge structure studies reveal that the Eu 2+ concentration in SLA‐SSM is much higher than that in in SrLiAl 3 N 4 :Eu 2+ and SrSiMg 3 N 4 :Eu 2+ phosphors. Finally, an overall mechanism was proposed to explain the how the change in photoluminescence is controlled by the size of the coordinated cation.