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Luminescent perovskites: From materials to light-emitting devices

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Luminescent perovskites: From materials to light-emitting devices

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dc.contributor.advisor Bolink, Henk
dc.contributor.advisor Sessolo, Michele
dc.contributor.author Martínez Sarti, Laura
dc.contributor.other Màster en Nanociència i Nanotecnologia Molecular es_ES
dc.date.accessioned 2020-01-23T10:18:45Z
dc.date.available 2020-01-24T05:45:05Z
dc.date.issued 2019 es_ES
dc.date.submitted 27-01-2020 es_ES
dc.identifier.uri https://hdl.handle.net/10550/72691
dc.description.abstract The thesis describes the preparation of efficient and simple bright halide perovskite materials and light-emitting devices. In the different chapters, several perovskite types are described and studied: Perovskites with different crystal sizes, from nanosized perovskites (Chapter 2, 3 and 4) to bulk perovskites (Chapter 5) all with a 3D crystal structure; and perovskites with different crystal structure dimensionalities, such as 3D or nanoplatelets with 2D (Chapter 3) and even quasi-2D structures (Chapter 2). Photoluminescence and electroluminescence with colours ranging from red to green and blue are reported. Chapter 2 focuses on obtaining stable and very PL efficient red-emitting hybrid quasi-2D perovskite NCs with a narrow linewidth. The work experiments with a controllable shift of the bandgap, accomplished by varying the chain length of the alkylammonium ligands employed in its synthesis. Chapter 3 describes the novel use of a bifunctional ligand for the synthesis of highly photoluminescent green-emitting MAPbBr3 NPs. Additionally, the ligand allows the nanostructures to effectively anchor on a variety of conducting polymers and inorganic semiconducting surfaces, which is used for the preparation of solution-based multilayer LEDs. Chapter 4 is about green-emitting LEDs with a remarkably high combination of EQE, luminance, power and current efficiency. The outstanding performance is described to be due to an energy cascade from hierarchical self-assembled structures. These structures, low-dimensional octylammonium lead bromide microplatelets (MPLs) and 3D FAPbBr3 NCs, form ultra-smooth films with a very high PLQY. Chapter 5 describes a mechanochemical synthesis of stable mixed-cation/mixed-halide lead perovskites powders (MA1-yCsyPb(BrnCl1-n)3) with emission spanning the green to blue region of the visible spectrum. Upon addition of amantadine hydrochloride, a strong enhancement in the PLQY can be obtained with only minor structural changes. es_ES
dc.format.extent 192 p. es_ES
dc.language.iso en es_ES
dc.subject perovskite es_ES
dc.title Luminescent perovskites: From materials to light-emitting devices es_ES
dc.type doctoral thesis es_ES
dc.subject.unesco UNESCO::QUÍMICA es_ES
dc.embargo.terms 0 days es_ES

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