Switchable Anion Exchange in Polymer-Encapsulated APbX 3 Nanocrystals Delivers Stable All-Perovskite White Emitters
| Autor: | Teresa Pellegrino, Binh T. Mai, Liberato Manna, Francesco Di Stasio, Matilde Cirignano, Luca Goldoni, Muhammad Imran, Houman Bahmani Jalali |
|---|---|
| Jazyk: | angličtina |
| Předmět: |
chemistry.chemical_classification
Photoluminescence Materials science Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology Halide 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Styrene chemistry.chemical_compound Fuel Technology Formamidinium chemistry Chemical engineering Nanocrystal Chemistry (miscellaneous) Materials Chemistry 0210 nano-technology Bifunctional Perovskite (structure) |
| Zdroj: | ACS Energy Letters |
| ISSN: | 2380-8195 |
| DOI: | 10.1021/acsenergylett.1c01232 |
| Popis: | We report a one-step synthesis of halide perovskite nanocrystals embedded in amphiphilic polymer (poly(acrylic acid)-block-poly(styrene), PAA-b-PS) micelles, based on injecting a dimethylformamide solution of PAA-b-PS, PbBr2, ABr (A = Cs, formamidinium, or both) and "additive" molecules in toluene. These bifunctional or trifunctional short chain organic molecules improve the nanocrystal-polymer compatibility, increasing the nanocrystal stability against polar solvents and high flux irradiation (the nanocrystals retain almost 80% of their photoluminescence after 1 h of 3.2 w/cm2 irradiation). If the nanocrystals are suspended in toluene, the coil state of the polymer allows the nanocrystals to undergo halide exchange, enabling emission color tunability. If the nanocrystals are suspended in methanol, or dried as powders, the polymer is in the globule state, and they are inert to halide exchange. By mixing three primary colors we could prepare stable, multicolor emissive samples (for example, white emitting powders) and a UV-to-white color converting layer for light-emitting diodes entirely made of perovskite nanocrystals. |
| Databáze: | OpenAIRE |
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