Dynamic CPL switching realized in chiral Mn-based metal halides with reversible thermochromism

Abstract

Circularly polarized luminescence (CPL) active materials have attracted much attention due to their extensive applications in 3D optical displays and encrypted transmission. The switchable regulation of CPL is of great...

Thermal/Water-Induced Phase Transformation and Photoluminescence of Hybrid Manganese(II)-Based Chloride Single Crystals

“…The PL decay lifetime of (1-mpip) 2 MnCl 6 is shown in Figure f. And fitted by the biexponential decay function, the average PL decay lifetime of (1-mpip) 2 MnCl 6 is around 1423.56 ns (1.424 μs), which is consistent with that of the previously reported hybrid manganese halides. ,, Because (1-mpip) 2 MnCl 6 belongs to the orthorhombic systems with chiral space group P 2 1 2 1 2 1 , the (1-mpip) 2 MnCl 6 single-crystalline powders in KBr pellets were prepared to conduct circular dichroism (CD) measurements. As shown in Figure S5, it is obvious that (1-mpip) 2 MnCl 6 single-crystalline grinding powders exhibited distinct CD spectra from 210 to 500 nm wavelength range before the extinction band edge, which indicated an obvious chiral characteristic of (1-mpip) 2 MnCl 6 attributed to the chiral arrangements of the [MnCl 4 ] group.…”

“…The PL decay lifetime of (1-mpip) 2 MnCl 6 is shown in Figure6f. And fitted by the biexponential decay function, the average PL decay lifetime of (1-mpip) 2 MnCl 6 is around 1423.56 ns (1.424 μs), which is consistent with that of the previously reported hybrid manganese halides 58,71,72. Because (1-mpip) 2 MnCl 6 belongs to the orthorhombic systems with chiral space group P2 1 2 1 2 1 , the (1-mpip) 2 MnCl 6 single-crystalline powders in KBr pellets were prepared to conduct circular dichroism (CD) measurements.…”

Dielectric/SHG/PL triple-channel properties in chiral spirocyclic organic–inorganic hybrids

“…It is worth noting that, the UV absorption and CD signal of ( R / S -HASD) 2 MnBr 4 appears before 350 nm, in keeping with most zero-dimensional Mn( ii )-based organic–inorganic hybrids. 46 Thus, the CD signals of both compounds confirm that ( R / S -HASD) 2 MnBr 4 contains chiral structure.…”

“…The PL properties come from the d–d transition of tetrahedral coordinated Mn 2+ , corresponding to the 3d 5 electronic transition of Mn 2+ from the excited state 4 T 1 to the ground state 6 A 1 . 46,54 The CIE chromaticity coordinates of ( R -HASD) 2 MnBr 4 and ( S -HASD) 2 MnBr 4 are (0.206, 0.697) and (0.211, 0.695), respectively, which are located in the green area shown in Fig. 5f.…”

Methanol‐Induced Crystallization of Chiral Hybrid Manganese (II) Chloride Single Crystals for Achieving Circularly Polarized Luminescence and Second Harmonic Generation

“…In the crystal structure of chiral (R/S-MBA)MnCl 3 •CH 3 OH, one Mn(II) atom coordinates with five Cl atoms and one oxygen atom derived from methanol (CH 3 OH) molecule forming a six-coordinated deformed octahedron {MnCl 5 (CH 3 OH)}, which deviates from standard octahedron in reported structure of (R/S-Br-MBA) 3 MnBr 5 single crystals. [67] (R/S-MBA)MnCl 3 •CH 3 OH preferentially crystallized due to the formation of the bond with the methanol molecules, rather than (R/S-MBA)MnCl 3 . [68] Moreover, the formation of Mn-O bond induces (R/S-MBA)MnCl 3 •CH 3 OH into chiral space group P2 1 (no.4), which exhibits lower structural symmetry than those Mn(II)-based halides crystallized in P2 1 2 1 2 1 or P2 1 /c.…”