Optical activity levels of metal centers controlling multi-mode emissions in low-dimensional hybrid metal halides for anti-counterfeiting and information encryption.

In-depth insight into the electronic competition principles between inorganic units and organic ligands proves to be extremely challenging for controlling multi-mode emissions in low-dimensional hybrid metal halides (LHMHs). Herein, an efficient blue emission from organic ligand was engineered in (DppyH)MCl (Dppy = diphenyl-2-pyridylphosphine, M = Zn, Cd) due to the reverse type I band alignment constructed by optically inert units with nd shell electrons. By contrast, the optically active [MnCl] with semi-fully filled 3d shell electrons prompts the band alignment of type II, resulting in the narrowband green emission of Mn, along with an energy transfer from DppyH to [MnCl].

Ligand Engineering Triggered Efficiency Tunable Emission in Zero-Dimensional Manganese Hybrids for White Light-Emitting Diodes.

Zero-dimensional (0D) hybrid manganese halides have emerged as promising platforms for the white light-emitting diodes (-LEDs) owing to their excellent optical properties. Necessary for researching on the structure-activity relationship of photoluminescence (PL), the novel manganese bromides (CHN)MnBr and (CHN)MnBr are reported by screening two ligands with similar atomic arrangements but various steric configurations. It is found that (CHN)MnBr with planar configuration tends to promote a stronger electron-phonon coupling, crystal filed effect and concentration-quenching effect than (CHN)MnBr with chair configuration, resulting in the broadband emission (FWHM = 63 nm) to peak at 539 nm with a large Stokes shift (70 nm) and a relatively low photoluminescence quantum yield (PLQY) (46.