A Facile Synthesis of Water‐Resistant CsPbBr₃ Perovskite Quantum Dots Loaded Poly(methyl methacrylate) Composite Microspheres Based on In Situ Polymerization

Abstract

In this paper, a facile synthesis of water‐resistant CsPbBr3 perovskite quantum dots (PQDs) loaded poly(methyl methacrylate) (PMMA) composite microspheres (CsPbBr3@PMMA) is reported. The method is based on the precipitation polymerization of methyl methacrylate in hexane in the presence of CsPbBr3 PQDs and stabilizer. The CsPbBr3@PMMA microspheres show a tunable size and a narrow size distribution, with the CsPbBr3 PQDs being uniformly dispersed in the PMMA microspheres. The effective incorporation of PQDs is attributed to the strong coordination interactions between Pb ions on the surface of PQDs and carbonyl groups (CO) from PMMA. Based on this mechanism, multicolor composite microspheres can be easily prepared through absorbing CsPbX3 (X = Cl, Br, I) PQDs into blank PMMA microspheres. Protected by the PMMA microspheres, the imbedded CsPbBr3 PQDs show improved water resistance and storage stability. Further, a wide‐color‐gamut (129%) white light‐emitting diode (LED) is demonstrated by combining the green‐emitting CsPbBr3@PMMA composite microspheres and red‐emitting K2SiF6: Mn4+ with a blue LED, which enables to be used as backlights for liquid crystal displays.

Water‐Dispersing Perovskite Probes for the Rapid Imaging of Glioma Cells

“…[24] The stretching vibration of the CO bond in pure PLGA appears at 1730 cm −1 , while it shifts to 1715 cm −1 upon interaction with PbBr 2 , indicating a weakened CO bond caused by interaction with the Lewis acid PbBr 2 . [25] Figure 1c illustrates the FTIR results. Peaks corresponding to PQDs at 1710 and 1554 cm −1 are observed, which are attributed to the vibrations of CO and oleate anions (-COO-) stretching, respectively.…”

The Stability of Metal Halide Perovskite Nanocrystals—A Key Issue for the Application on Quantum-Dot-Based Micro Light-Emitting Diodes Display

“…Cai et al prepare the composite microspheres of polymethyl methacrylate (PMMA) loaded with CsPbBr 3 PQDs (CsPbBr 3 @ PMMA) by in situ polymerization of methyl methacrylate in hexane in the presence of CsPbBr 3 NC and stabilizer [ 81 ]. Due to the strong coordination interaction between the Pb ion on the surface of NC and the carbonyl group (C=O) of PMMA, NCs can be gradually incorporated as the microspheres grow, making them uniformly and firmly dispersed in the microspheres, shown in Figure 33 .…”

“…Inset in ( a ) is the corresponding high-resolution TEM image of a selected MAA-CsPbBr 3 PQD. Reproduced from [ 81 ].…”

Organic additive engineering toward efficient perovskite light‐emitting diodes

“…Xie, Wang, and coworkers also mixed CsPbBr 3 crystals with PMMA by a different method and demonstrated similar results. 81 Yang and coworkers incorporated poly(maleic anhydride-alt-1-octadecene) into CsPbBr 3 perovskite films as a protection agent. The perovskite composite film nearly maintained its PL intensity after 40 days in the air.…”