Luminescent lead halide perovskite nanocrystals (LHP NCs) have attracted great attention. This work reports the synthesis of well‐defined core/shell structured CH3NH3PbBr3/β‐cyclodextrin (MAPbBr3/β‐CD) nanodots via host‐guest interaction between β‐cyclodextrin and hexylamine. The MAPbBr3/β‐CD nanodots show high luminescence with photoluminescence quantum yields (PLQYs) of 89.7% in solution and 38.0% in solid state. The MAPbBr3/β‐CD nanodots have superior stability in water, under heat and UV light exposure due to the formation of a β‐CD shell, which gives them great potential for optoelectrical and biological applications.

Stretchable and self-healing polymer gels with luminescent property are very promising materials for next generation soft optical devices. This work presents the preparation of self-healing and luminescent polymer gels by simply blending organometal halide perovskite nanocrystals (OHP NCs) with poly(dimethylsiloxane)-urea copolymer (PDMS-urea). On the one hand, the obtained luminescent gels are not only flexible, stretchable and relatively transparent, they also exhibit excellent self-healing capability due to the reversible hydrogen bonding network in the PDMS-urea copolymer. On the other hand, the embedding of OHP NCs (MAPbBr3 and MAPbI3 NCs) inside the hydrophobic PDMS-urea gel greatly improved the photoluminescence stability of OHP NCs against water. Their applications as phosphors for LEDs have been demonstrated. Both the MAPbBr3/PDMS-urea gel and MAPbI3/PDMS-urea gel can fully convert the blue emission of GaN chip to green and red emissions, respectively. These gels can be used as photoluminescent materials in flexible optical devices with good self-healing capability.

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In this study, TiO2/CuS nanocomposites with cauliflower-like protrusions were successfully prepared using a simple one-step hydrothermal method with the assistance of 3-mercaptopropionic acid (3-MPA). The TiO2 and CuS formed heterojunction...

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