Synthesis, structures, photoluminescence and magnetic properties of three dinuclear lanthanide(III) complexes derived from 4‐fluorophenylselenoacetic acid

Abstract

Three novel dinuclear lanthanide(III) complexes [Ln 2 L 6 (phen) 2 ] (Ln=Eu III (1), Tb III (2), Dy III (3)), derived from 4-fluorophenylselenoacetic acid and 1,10-phenanthroline, have been synthesized and characterized by elemental analysis, IR, TGA, powder X-ray diffraction and single-crystal X-ray diffraction analysis. Single crystal X-ray diffraction reveal they are isostructural and crystallize in the monoclinic crystal system, space group P2(1)/c. The investigations on luminescent properties of Eu(III) complex 1 and Tb(III) complex 2 exhibit the characteristic emissions of Eu III ( 5 D 0 ! 7 F 0-4 ) and Tb III ( 5 D 4 ! 7 F 6-3 ), and the corresponding luminescent lifetimes are 1.52 and 1.10 ms, respectively. Temperature-dependent photoluminescence studies show the emission intensities and lifetimes for both complexes decrease upon increasing temperature, which indicates complexes 1 and 2 have the potential for sensing temperature. The magnetic studies reveal that Dy(III) complex 3 exhibits weak antiferromagnetic interactions and slow magnetic relaxation behavior.

Organic‐Inorganic Hybrid Low‐dimensional Lead Iodides with Broadband Yellow to Red Light Emissions

“…Lead halide perovskites, as a family of emerging semiconductor optoelectronic materials, have been widely investigated in recent years due to their abundant structural types, adjustable band structures and the potential applications in the fields of solar cells, photodetectors, lasers, and light‐emitting diodes [1–5] . Especially, traditional CsPbX 3 perovskites display outstanding photoluminescence (PL) performances with various advantages of adjustable composition and band gaps, tunable emission wavelength covering the entire visible spectra, narrow bandwidth, high photoluminescence quantum yield (PLQY) as well as facile syntheses processes [6–10] . At the same time, 3D perovskites can be tailored into manifold 2D layers, 1D chains and 0D clusters containing various connecting manners of corner‐, edge‐ and face‐sharing between octahedral [PbX 6 ] units.…”

“…[1][2][3][4][5] Especially, traditional CsPbX 3 perovskites display outstanding photoluminescence (PL) performances with various advantages of adjustable composition and band gaps, tunable emission wavelength covering the entire visible spectra, narrow bandwidth, high photoluminescence quantum yield (PLQY) as well as facile syntheses processes. [6][7][8][9][10] At the same time, 3D perovskites can be tailored into manifold 2D layers, 1D chains and 0D clusters containing various connecting manners of corner-, edge-and face-sharing between octahedral [PbX 6 ] units. By using organic cations to replace Cs + , a large amount of organic-inorganic hybrid lead halide perovskites have been explored extensively as luminescent materials.…”