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Investigation into the Photoluminescence Red Shift in Cesium Lead Bromide Nanocrystal Superlattices

[Image: see text] The formation of cesium lead bromide (CsPbBr(3)) nanocrystal superlattices (NC SLs) is accompanied by a red shift in the NC photoluminescence (PL). The values of the PL red shift reported in the literature range from none to ∼100 meV without unifying explanation of the differences....

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Detalles Bibliográficos
Autores principales: Baranov, Dmitry, Toso, Stefano, Imran, Muhammad, Manna, Liberato
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2019
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6477804/
https://www.ncbi.nlm.nih.gov/pubmed/30676762
http://dx.doi.org/10.1021/acs.jpclett.9b00178
Descripción
Sumario:[Image: see text] The formation of cesium lead bromide (CsPbBr(3)) nanocrystal superlattices (NC SLs) is accompanied by a red shift in the NC photoluminescence (PL). The values of the PL red shift reported in the literature range from none to ∼100 meV without unifying explanation of the differences. Using a combination of confocal PL microcopy and steady-state optical spectroscopies we found that an overall PL red shift of ∼96 meV measured from a macroscopic sample of CsPbBr(3) NC SLs has several contributions: ∼ 10–15 meV from a red shift in isolated and clean SLs, ∼ 30 meV from SLs with impurities of bulklike CsPbBr(3) crystals on their surface, and up to 50 meV or more of the red shift coming from a photon propagation effect, specifically self-absorption. In addition, a self-assembly technique for growing micron-sized NC SLs on the surface of perfluorodecalin, an inert perfluorinated liquid and an antisolvent for NCs, is described.