2 research outputs found
All-Perovskite Multicomponent Nanocrystal Superlattices
Nanocrystal superlattices (NC SLs) have long been sought
as promising
metamaterials, with nanoscale-engineered properties arising from collective
and synergistic effects among the constituent building blocks. Lead
halide perovskite (LHP) NCs come across as outstanding candidates
for SL design, as they demonstrate collective light emission, known
as superfluorescence, in single- and multicomponent SLs. Thus far,
LHP NCs have only been assembled in single-component SLs or coassembled
with dielectric NC building blocks acting solely as spacers between
luminescent NCs. Here, we report the formation of multicomponent LHP
NC-only SLs, i.e., using only CsPbBr3 NCs of different
sizes as building blocks. The structural diversity of the obtained
SLs encompasses the ABO6, ABO3, and NaCl structure
types, all of which contain orientationally and positionally locked
NCs. For the selected model system, the ABO6-type SL, we
observed efficient NC coupling and FoĢrster-like energy transfer
from strongly confined 5.3 nm CsPbBr3 NCs to weakly confined
17.6 nm CsPbBr3 NCs, along with characteristic superfluorescence
features at cryogenic temperatures. Spatiotemporal exciton dynamics
measurements reveal that binary SLs exhibit enhanced exciton diffusivity
compared to single-component NC assemblies across the entire temperature
range (from 5 to 298 K). The observed coherent and incoherent NC coupling
and controllable excitonic transport within the solid NC SLs hold
promise for applications in quantum optoelectronic devices
All-Perovskite Multicomponent Nanocrystal Superlattices
Nanocrystal superlattices (NC SLs) have long been sought
as promising
metamaterials, with nanoscale-engineered properties arising from collective
and synergistic effects among the constituent building blocks. Lead
halide perovskite (LHP) NCs come across as outstanding candidates
for SL design, as they demonstrate collective light emission, known
as superfluorescence, in single- and multicomponent SLs. Thus far,
LHP NCs have only been assembled in single-component SLs or coassembled
with dielectric NC building blocks acting solely as spacers between
luminescent NCs. Here, we report the formation of multicomponent LHP
NC-only SLs, i.e., using only CsPbBr3 NCs of different
sizes as building blocks. The structural diversity of the obtained
SLs encompasses the ABO6, ABO3, and NaCl structure
types, all of which contain orientationally and positionally locked
NCs. For the selected model system, the ABO6-type SL, we
observed efficient NC coupling and FoĢrster-like energy transfer
from strongly confined 5.3 nm CsPbBr3 NCs to weakly confined
17.6 nm CsPbBr3 NCs, along with characteristic superfluorescence
features at cryogenic temperatures. Spatiotemporal exciton dynamics
measurements reveal that binary SLs exhibit enhanced exciton diffusivity
compared to single-component NC assemblies across the entire temperature
range (from 5 to 298 K). The observed coherent and incoherent NC coupling
and controllable excitonic transport within the solid NC SLs hold
promise for applications in quantum optoelectronic devices