| Autor: |
Zhou QJ; Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China., Cao P; Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China., Zhou ZN; Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China., Xu K; Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China., Yang YW; Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China., He L; Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China., Ye Q; Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China. |
| Abstrakt: |
Double perovskites (DPs) have attracted attention in the field of luminescence due to their inherent broadband emission of self-trapping excitons. In this work, we choose [(CH 3 ) 3 NCH 2 CHCH 2 ] + and [CH 3 CHOHCH 2 NH 2 ] + as organic cations to synthesize two new organic-inorganic hybrid DPs, [(CH 3 ) 3 NCH 2 CHCH 2 ] 2 KInCl 6 ( 1 ) and [CH 3 CHOHCH 2 NH 2 ] 2 KInCl 6 ( 2 ). The [KCl 6 ] 3- and [InCl 6 ] 3- octahedra are interchangeably connected by sharing two opposite faces, forming a one-dimensional coordination chain. Each K atom coordinates with six chlorine atoms in 1 , while it coordinates with two oxygen atoms in addition to the six chlorine atoms in 2 . The coordination between ions K and O in compound 2 may have significantly reduced its luminescence. As a result, compound 1 shows bright-yellow light with a quantum yield of more than 90%, while 2 shows weak blue light with a quantum yield of only 0.98%. In addition, different from no phase transition found in 2 , 1 undergoes a reversible phase transition at 324/307 K in the heating-cooling cycle. Through structural and spectral analysis and density functional theory calculation, we conclude that the larger degree of [InCl 6 ] 3- octahedral distortion and the larger anion distance (In···In) also cause the PLQY of compound 1 to be higher than that of compound 2 . |
