Enhancing the Stability of Perovskite Quantum Dots by Encapsulation in Crosslinked Polystyrene Beads via a Swelling–Shrinking Strategy toward Superior Water Resistance

Abstract

Organic/inorganic hybrid lead halide perovskites are promising optoelectronic materials due to their unique structure, excellent properties, and fascinating potential applications in lighting, photovoltaic, etc. However, perovskite materials are very sensitive to moisture and polar solvent, which greatly hinders their practical applications. Here, highly luminescent perovskite-polystyrene composite beads with uniform morphology are prepared via a simple swelling-shrinking strategy. This process is carried out only in nonpolar toluene and hexane without the addition of any polar reagents. As a result, the as-prepared composite beads not only retain high luminescence but also exhibit superior water-resistant property. The composites emit strong luminescence after being immersed into water over nine months. Moreover, even in some harsh environments such as acid/alkali aqueous solution, phosphate buffer solution, and Dulbecco's modified eagle medium biological buffers, they still preserve high luminescence. The applications in light-emitting diodes and cellular labeling agents are also carried out to demonstrate their ultrastability.

Confinement and passivation of perovskite quantum dots in porous natural palygorskite toward an efficient and ultrastable light-harvesting system in water

“…S16†) in water, which is higher than that of CsPbBr 3 –zeolite-Y, CsPbBr 3 –SiO 2 and CsPbBr 3 –AlPO-5 composite phosphors. 37,39,64 However, the CsPbBr 3 QDs have almost no PL (Fig. S17†) in water, which is in agreement with previous reports about the low QY for perovskite QDs without ligand passivation or matrix encapsulation.…”

Confinement and passivation of perovskite quantum dots in porous natural palygorskite toward an efficient and ultrastable light-harvesting system in water

“…S16†) in water, which is higher than that of CsPbBr 3 –zeolite-Y, CsPbBr 3 –SiO 2 and CsPbBr 3 –AlPO-5 composite phosphors. 37,39,64 However, the CsPbBr 3 QDs have almost no PL (Fig. S17†) in water, which is in agreement with previous reports about the low QY for perovskite QDs without ligand passivation or matrix encapsulation.…”

Spray‐Assisted Coil–Globule Transition for Scalable Preparation of Water‐Resistant CsPbBr3@PMMA Perovskite Nanospheres with Application in Live Cell Imaging

“…The fluorescence intensity of CPB PQD colloid declined nearly 100% within 1 h in case of either water or ethanol, as shown in Figure a. Meanwhile, the CPB@PMMA nanospheres retained stable fluorescence intensities over the 80 days of this study in both water and ethanol, with the intensity loss of only 19% and 8%, respectively, comparable to literatures …”

Preparation and Fluorescence Properties of Silicon-Coated Cruciform CsPbBr3 Nanocrystals

“…These results indicate that the prepared CsPbBr 3 @SiO 2 composite retains excellent high ethanol resistance. 23 Similar findings were reported by Mohapatra et al, who found that silica-encapsulated CsPbBr 3 NCs exhibited low cytotoxicity and sustained fluorescence in polar biological environments, highlighting the dual benefits of optics and stability. 69 To further evaluate the optical stability of the CsPbBr 3 @SiO 2 NCs under practical excitation conditions, we tested their photoluminescence retention under continuous blue-light (450 nm) and UV-light (365 nm) irradiation.…”

Confinement and passivation of perovskite quantum dots in porous natural palygorskite toward an efficient and ultrastable light-harvesting system in water

“…S16†) in water, which is higher than that of CsPbBr 3 –zeolite-Y, CsPbBr 3 –SiO 2 and CsPbBr 3 –AlPO-5 composite phosphors. 37,39,64 However, the CsPbBr 3 QDs have almost no PL (Fig. S17†) in water, which is in agreement with previous reports about the low QY for perovskite QDs without ligand passivation or matrix encapsulation.…”

Spray‐Assisted Coil–Globule Transition for Scalable Preparation of Water‐Resistant CsPbBr3@PMMA Perovskite Nanospheres with Application in Live Cell Imaging

“…The fluorescence intensity of CPB PQD colloid declined nearly 100% within 1 h in case of either water or ethanol, as shown in Figure a. Meanwhile, the CPB@PMMA nanospheres retained stable fluorescence intensities over the 80 days of this study in both water and ethanol, with the intensity loss of only 19% and 8%, respectively, comparable to literatures …”

Preparation and Fluorescence Properties of Silicon-Coated Cruciform CsPbBr3 Nanocrystals

“…These results indicate that the prepared CsPbBr 3 @SiO 2 composite retains excellent high ethanol resistance. 23 Similar findings were reported by Mohapatra et al, who found that silica-encapsulated CsPbBr 3 NCs exhibited low cytotoxicity and sustained fluorescence in polar biological environments, highlighting the dual benefits of optics and stability. 69 To further evaluate the optical stability of the CsPbBr 3 @SiO 2 NCs under practical excitation conditions, we tested their photoluminescence retention under continuous blue-light (450 nm) and UV-light (365 nm) irradiation.…”

Confinement and passivation of perovskite quantum dots in porous natural palygorskite toward an efficient and ultrastable light-harvesting system in water

“…S16†) in water, which is higher than that of CsPbBr 3 –zeolite-Y, CsPbBr 3 –SiO 2 and CsPbBr 3 –AlPO-5 composite phosphors. 37,39,64 However, the CsPbBr 3 QDs have almost no PL (Fig. S17†) in water, which is in agreement with previous reports about the low QY for perovskite QDs without ligand passivation or matrix encapsulation.…”

Spray‐Assisted Coil–Globule Transition for Scalable Preparation of Water‐Resistant CsPbBr3@PMMA Perovskite Nanospheres with Application in Live Cell Imaging

“…The fluorescence intensity of CPB PQD colloid declined nearly 100% within 1 h in case of either water or ethanol, as shown in Figure a. Meanwhile, the CPB@PMMA nanospheres retained stable fluorescence intensities over the 80 days of this study in both water and ethanol, with the intensity loss of only 19% and 8%, respectively, comparable to literatures …”

Preparation and Fluorescence Properties of Silicon-Coated Cruciform CsPbBr3 Nanocrystals

“…These results indicate that the prepared CsPbBr 3 @SiO 2 composite retains excellent high ethanol resistance. 23 Similar findings were reported by Mohapatra et al, who found that silica-encapsulated CsPbBr 3 NCs exhibited low cytotoxicity and sustained fluorescence in polar biological environments, highlighting the dual benefits of optics and stability. 69 To further evaluate the optical stability of the CsPbBr 3 @SiO 2 NCs under practical excitation conditions, we tested their photoluminescence retention under continuous blue-light (450 nm) and UV-light (365 nm) irradiation.…”