Bright-Emitting Perovskite Films by Large-Scale Synthesis
and Photoinduced Solid-State Transformation of CsPbBr3 Nanoplatelets
Version 2 2017-10-18, 15:20
Version 1 2017-09-29, 19:23
Posted on 2017-10-18 - 15:20
Lead
halide perovskite nanocrystals are an emerging class of materials
that have gained wide interest due to their facile color tuning and
high photoluminescence quantum yield. However, the lack of techniques
to translate the high performance of nanocrystals into solid films
restricts the successful exploitation of such materials in optoelectronics
applications. Here, we report a heat-up and large-scale synthesis
of quantum-confined, blue-emitting CsPbBr3 nanoplatelets
(NPLs) that self-assemble into stacked lamellar structures. Spin-coated
films fabricated from these NPLs show a stable blue emission with
a photoluminescence quantum yield (PLQY) of 25%. The morphology and
the optoelectronic properties of such films can be dramatically modified
by UV-light irradiation under ambient conditions at a high power,
which transforms the self-assembled stacks of NPLs into much larger
structures, such as square-shaped disks and nanobelts. The emission
from the transformed thin films falls within the green spectral region
with a record PLQY of 65%, and they manifest an amplified spontaneous
emission with a sharp line width of 4 nm at full-width at half-maximum
under femtosecond-pulsed excitation. The transformed films show stable
photocurrents with a responsivity of up to 15 mA/W and response times
of tens of milliseconds and are robust under treatment with different
solvents. We exploit their insolubility in ethanol to fabricate green-emitting,
all-solution-processed light-emitting diodes with an external quantum
efficiency of 1.1% and a luminance of 590 Cd/m2.
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Shamsi, Javad; Rastogi, Prachi; Caligiuri, Vincenzo; Abdelhady, Ahmed L.; Spirito, Davide; Manna, Liberato; et al. (2017). Bright-Emitting Perovskite Films by Large-Scale Synthesis
and Photoinduced Solid-State Transformation of CsPbBr3 Nanoplatelets. ACS Publications. Collection. https://doi.org/10.1021/acsnano.7b04761
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AUTHORS (7)
JS
Javad Shamsi
PR
Prachi Rastogi
VC
Vincenzo Caligiuri
AA
Ahmed L. Abdelhady
DS
Davide Spirito
LM
Liberato Manna
RK
Roman Krahne