Descripción del proyecto
Una nueva ruta de síntesis química de puntos cuánticos sin cadmio
El mundo académico y el de la industria han prestado mucha atención a los nanocristales semiconductores coloidales, o puntos cuánticos, debido a sus propiedades electrónicas y ópticas únicas. Por lo general, los puntos cuánticos están hechos de compuestos binarios que, a menudo, contienen cadmio, una sustancia tóxica que obstaculiza su uso en productos de consumo. Los avances recientes en la síntesis de puntos cuánticos de fosfuro de indio los convierten en una alternativa prometedora sin cadmio. Un parámetro crítico para su uso en dispositivos fotoemisores es lograr un espectro de emisión de fluorescencia de banda estrecha. Los investigadores del proyecto InPlane, financiado por las Acciones Marie Skłodowska-Curie, están desarrollando un nuevo método de síntesis química de nanoplaquetas bidimensionales de fosfuro de indio. Para lograrlo, se centrarán en la recristalización de pequeños nanocristales de fosfuro de indio y en el intercambio catiónico.
Objetivo
Colloidal semiconductor nanocrystals (NCs) attract immense interest both from the scientific community and industrial companies/startups, due to their unique optical properties that are tunable in a wide range through changing their composition, size, shape, etc. However, currently, the implementation of the well-developed NCs in consumer products is hindered by the presence of toxic cadmium and the development of “Cd-free” NCs, investigation and optimization of their properties are important challenges in the field. Among the most promising “Cd-free” alternatives are indium phosphide (InP) NCs but despite all advances in their synthesis, there is still a need to achieve narrow fluorescence of such NCs – a parameter crucial for their applications in light-emitting devices (e.g. in displays).
In this project, we propose a novel approach to solve this issue, which consists in the chemical synthesis of two-dimensional InP nanoplatelets (NPls). To achieve this, two strategies will be examined: recrystallization of small InP NCs and cation exchange. The research of the first strategy will involve studying precursor reactivity, searching for a suitable promoter of anisotropic growth, and on the optimization of the reaction conditions. The cation exchange strategy will focus on the investigation of the incorporation of indium ions into the pre-synthesized Cu3-xP NPls to achieve complete cation exchange. In the next stages, further work will concentrate on the optimization of obtained NPls for practical applications through achieving spectral tunability by alloying and through maximizing photoluminescence quantum yield and stability by covering InP NPls with a wide bandgap shell. Additionally, to demonstrate the application potential of the prepared NPls and related heterostructures the extensive characterization of chemical and physical properties of InP NPls will be conducted with the specific focus on the properties relevant for light-emitting applications.
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MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)Coordinador
01069 Dresden
Alemania