All-inorganic halide perovskite crystals
are considered excellent
optical host lattices for various dopants to obtain wavelength-tunable
emissions with ultra-broad bands even over a wide spectral range.
Here, a series of Mn2+-doped bulk ligand-free CsCdCl3 (CCC) perovskite crystals with a hexagonal shape and size
of about 1 millimeter (mm) have been prepared by a facile hydrothermal
method. These CCC:Mn2+ (CCC:Mn) crystals emit the representative
orange-red photoluminescence (PL) of Mn2+ (4T1(G)-6A1(S)) in the centers of
hexagonal octahedrons coordinated with six Cl– ions.
A fine-tuning of the Mn2+ concentration from 1 to 50 mol
% Cd2+ induces a substantial red shift of emission spectra
from 570 to 630 nm due to the shrinkage of the crystalline host lattice,
and the maximum intensity of emission is achieved at 20 mol % Mn2+ doping. A further increase in the Mn2+ concentration
causes a decrease of the PL intensity due to the phase transition
from CCC to CsMnCl3·2H2O (CMCH). The strong
excitation bands at 360, 370, 420, and 440 nm can make the excitation
of the emissive CCC:Mn crystals possible with ultraviolet (UV) and
blue chips for application in white light-emitting diodes (WLEDs).
The similarity of the Mn2+-concentration-dependent emission
spectra excited by various wavelengths indicates that there is only
one type of site for Mn2+ occupation in CCC.
A facile strategy for water probing with visible perception is of particular importance to water transport, ecosystem sustainability, and the ocean industry. Here, we have developed a simple technology to...
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