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Templated‐Assembly of CsPbBr 3 Perovskite Nanocrystals into 2D Photonic Supercrystals with Amplified Spontaneous Emission
Author(s) -
VilaLiarte David,
Feil Maximilian W.,
Manzi Aurora,
GarciaPomar Juan Luis,
Huang He,
Döblinger Markus,
LizMarzán Luis M,
Feldmann Jochen,
Polavarapu Lakshminarayana,
Mihi Agustín
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202006152
Subject(s) - materials science , nanocrystal , photonic crystal , photonics , perovskite (structure) , optoelectronics , light emission , colloidal crystal , nanotechnology , colloid , crystallography , chemistry
Perovskite nanocrystals (NCs) have revolutionized optoelectronic devices because of their versatile optical properties. However, controlling and extending these functionalities often requires a light‐management strategy involving additional processing steps. Herein, we introduce a simple approach to shape perovskite nanocrystals (NC) into photonic architectures that provide light management by directly shaping the active material. Pre‐patterned polydimethylsiloxane (PDMS) templates are used for the template‐induced self‐assembly of 10 nm CsPbBr 3 perovskite NC colloids into large area (1 cm 2 ) 2D photonic crystals with tunable lattice spacing, ranging from 400 nm up to several microns. The photonic crystal arrangement facilitates efficient light coupling to the nanocrystal layer, thereby increasing the electric field intensity within the perovskite film. As a result, CsPbBr 3 2D photonic crystals show amplified spontaneous emission (ASE) under lower optical excitation fluences in the near‐IR, in contrast to equivalent flat NC films prepared using the same colloidal ink. This improvement is attributed to the enhanced multi‐photon absorption caused by light trapping in the photonic crystal.