Structural design enables highly-efficient green emission with preferable blue light excitation from zero-dimensional manganese (II) hybrids

An Efficient Cyan Emission from Copper (II) Complexes with Mixed Organic Conjugate Ligands

“…These complexes possess unique optical and magnetic properties arising from unpaired d-electrons and a non-zero spin angular momentum. Although some examples of complexes with high-spin ground states and ordered structures have been achieved (Mn) [ 2 , 3 , 4 , 5 ], the rational design and synthesis of novel transition metal complexes remains a challenge for luminescent sensors, photo-luminescent devices, and biological probes [ 6 , 7 , 8 , 9 ].…”

Unraveling the Ultrafast Self-assembly and Photoluminescence in Zero-Dimensional Mn2+-Based Halides with Narrow-Band Green Emissions

“…A variety of 0D Mn 2+ -based/Mn 2+ -doped halides have been reported, resulting in green-light emissions and red-light emissions, respectively. ,,− In this work, we emphasize and investigate the synthesis methods, crystal structure, and PL characteristics of 0D Mn 2+ -based halides with narrow-band green emissions. It is worth noting that the halogen atoms and subtle changes in crystal structure will become factors in regulating the fluorescence emission peak position (500–550 nm), emission line widths (40–60 nm), and lifetimes (the shortest for iodides, the second for bromides, and the longest for chlorides) by influencing the ligand-field effects and nephelauxetic effects. , Moreover, Xia et al and Seshadri et al have discussed in depth the tuning relationship between the crystal structure and luminescence performances and found that a sufficiently long Mn···Mn distance enables all Mn 2+ centers to emit spontaneously, thereby leading to near-unity narrow-band green-light emissions in 0D Mn 2+ -based halides. , Even though most Mn 2+ -based emitters were applied as green-light components in LCD backlight and similar 0D Mn 2+ -based halides show a good application prospect in the field of solid-state displays, an easy-to-operate and large-scale synthesis method has not been proposed, and the characteristics of ultrafast self-assembly have not yet been fundamentally unraveled. It is well known that the preparation methods of metal halides are as follows: cooling crystallization, antisolvent crystallization, hydrothermal crystallization, etc.…”

Dipole-Orientation-Dependent Förster Resonance Energy Transfer from Aromatic Head Groups to MnBr42– Blocks in Organic–Inorganic Hybrids

“…The selection could be relaxed by mixing other electronic orbitals or vibrionic modes with opposite parity into Mn d wave function. Thus, a low site symmetry (to mix odd vibrionic modes) and a stronger bond covalency (to mix more p orbitals of the ligand) should accelerate the PL decay, particularly in the case of tetrahedrally coordinated Mn without inversion symmetry . The distorted MnBr 4 2– tetrahedra with low Mn 2+ site symmetry could also determine the dipole moments, which may significantly influence the PL properties.…”

“…Thus, a low site symmetry (to mix odd vibrionic modes) and a stronger bond covalency (to mix more p orbitals of the ligand) should accelerate the PL decay, particularly in the case of tetrahedrally coordinated Mn without inversion symmetry. 34 The distorted MnBr 4 2− tetrahedra with low Mn 2+ site symmetry could also determine the dipole moments, which may significantly influence the PL properties. The calculated distortion indices for [C16mim] 2 MnBr 4 are 6.77 × 10 −4 and 5.74 × 10 −4 , respectively, for Mn1 and Mn2 tetrahedrons (as seen in Figure 4b and Table S8).…”