Instability of perovskite nanocrystals driven by their ionic crystal characteristic poses a grand challenge for long-term practical applications in optoelectronic materials and devices. Herein, we report the crafting of amphiphilic perovskite nanocrystal composites (APNCCs) with a set of markedly improved stabilities via capitalizing on polymer-grafted silica nanosheets as nanoreactors in conjunction with surface ligand engineering. First, SiO2 nanosheets grafted with poly(acrylic acid)-block-polystyrene (denoted SiO2 @PAA-b-PS) are rationally designed and exploited as nanoreactors to form SiO2 @CsPbBr3 @PS. Subsequent passivation with small-molecule ligands (L) yields highly emissive SiO2 @CsPbBr3 @ (PS/L) APNCCs with an array of outstanding stabilities against UV, heat, water, long-term storage, and various polar organic solvents. Remarkably, our strategy integrating polymer-grafted SiO2 nanosheet nanoreactor with surface ligand engineering is general and viable. A diversity of stable APNCCs can be readily created. Finally, white light-emitting diode (WLED) with wide color gamut and excellent stability composed of green-emitting SiO2 @CsPbBr3 @ (PS/L) APNCCs is demonstrated. This work highlights the robustness of the synergy of judiciously-designed nanoreactor and surface ligand engineering to produce highly emissive, ultrastable perovskite nanocrystals shielded with soft and hard materials (i.e., possessing a Janus surface chemistry).
Bibliographical noteFunding Information:
This work was supported by the National Natural Science Foundation of China (52173207), Hunan Provincial Natural Science Foundation of China (2020JJ5542, 2021JJ10029) and National Science Foundation of the United States (CMMI 1914713; CBET 1803495).
This work was supported by the National Natural Science Foundation of China ( 52173207 ), Hunan Provincial Natural Science Foundation of China ( 2020JJ5542 , 2021JJ10029 ) and NSF ( CMMI 1914713 ).
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- High emission
- Perovskite nanocrystal
- Polymer-grafted silica nanoreactor
- Surface ligand engineering