Enhanced Stability of FAPbBr<SUB>3 </SUB>Nanoparticle-Polymer Composite Films
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초록
내용
Lead halide perovskite nanoparticles are promising materials for light-emitting diodes (LEDs) because of their superior optical properties. However, their practical applications are often hindered by the poor stability of perovskite nanoparticles against polar solvents including water. Additionally, micropatterning of perovskite is highly demanded for their LED device fabrications. In this experiment, perovskite nanoparticle composite films are prepared by photosynthesis of polymers and formamidinium lead bromide (FAPbBr3) nanoparticles. Patterns of FAPbBr3 nanoparticles are formed by controlling the size exclusive flow of nanoparticles in polymer networks and the position of nanoparticles is spatially controlled in both lateral and vertical directions. The composite films show not only high-resolution pattern and excellent resistance to various aqueous and organic solvents, but also high photoluminescence quantum yield (up to 44%) and broad color tunability in visible region.