Bulk Assembly of Multicomponent Zero-Dimensional Metal Halides with Dual Emission

Bulk
assemblies of zero-dimensional (0D) metal halides with exceptional
structural versatility have enabled the development of a number of
highly efficient emitters with tunable photophysical properties. Here,
we report a novel single crystalline bulk assembly of multicomponent
0D metal halides, (bmpy)9[SbCl5]2[Pb3Cl11] (bmpy = 1-butyl-1-methylpyrrolidinium),
which exhibits dual emissions from distinct metal halide species.
Excitation-dependent warm white light emissions with high photoluminescence
quantum efficiencies of >70% can be obtained by combining green
emission
from Pb3Cl115– and orange
emission from SbCl52–. Because of complete
site isolation by wide bandgap organic moieties and little-to-no spectral
overlaps, no energy transfer occurs between two distinct emitting
species, allowing for precise color control by manipulating the excitation
wavelengths. Our discovery of dual emitting organic metal halide hybrid
opens up a new way to develop precisely ordered single-crystalline
multicomponent materials with multi-functionalities.