Abstract
Thanks to solution processability and broad emission in the visible spectral range, 2D hybrid perovskite-like materials are interesting for the realization of large area and flexible lighting devices. However, the deposition of these materials requires broad-spectrum solvents that can easily dissolve most of the commercial polymers and make perovskites incompatible with flexible photonics. Here, we demonstrated the integration of broadband-emitting (EDBE)PbCl4 (where EDBE = 2,2-(ethylenedioxy)bis(ethylammonium)) thin films with a solution-processed polymer planar microcavities, employing a sacrificial polymer multilayer. This approach allowed for spectral and angular redistribution of the perovskite-like material, photoluminescence, that can pave the way to all-solution-processed and flexible lightning devices that do not require complex and costly fabrication techniques.
Highlights
Hybrid perovskites garnered increasing interest due to the ease of engineering their optoelectronic properties via simple wet chemistry and to the good power conversion efficiencies achieved in photovoltaics [1,2,3,4,5,6,7,8,9,10]
In a previous work, we coupled white emitting (EDBE)PbCl4 thin films casted on fused silica or thick polyethylene terephthalate substrates, with distributed Bragg reflectors (DBRs) that where successively grown on top of the perovskite layer to create half microcavities able of emission enhancement and suppression [21]
(EDBE)PbCl4 thin films were spun-cast at 4000 RPM for 60 s from a 0.1 M solution prepared by mixing stoichiometric amounts of (EDBE)Cl2 and PbCl2 (99.999% trace metal basis, Aldrich) in dimethyl sulfoxide
Summary
Hybrid perovskites garnered increasing interest due to the ease of engineering their optoelectronic properties via simple wet chemistry and to the good power conversion efficiencies achieved in photovoltaics [1,2,3,4,5,6,7,8,9,10]. Among the large variety of photonic structures demonstrated in recent decades, spun-cast planar microcavities and distributed Bragg reflectors (DBRs) are a viable and low-cost approach to this task thanks to solution processing and the large availability of polymer media [35] These structures consist of dielectric lattices made of thin film with different refractive indexes, alternated periodically, that interact with light generating specific frequency regions forbidden photon propagation, namely photonic band gaps (PBGs). As with most solution-processable perovskites, (EDBE)PbCl4 can only be casted from broad-spectrum solvents such as dimethylformamide (DMF) and dimethyl sulfoxide (DMSO), which are solvents for most of the commercial polymers, making mutual processing of polymer photonic structures and perovskites incompatible To circumvent these limitations, in a previous work, we coupled white emitting (EDBE)PbCl4 thin films casted on fused silica or thick polyethylene terephthalate substrates, with DBRs that where successively grown on top of the perovskite layer to create half microcavities able of emission enhancement and suppression [21]. Notwithstanding the fact that this layer was dissolved during the (EDBE)PbCl4 deposition by a DMSO-based precursor solution, the resulting structure could reshape the perovskite-like material emission and enhance its intensity
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