Stretchable and self-healable organometal halide perovskite nanocrystal-embedded polymer gels with enhanced luminescence stability

Abstract

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.

High Optical Performance of Cyan‐Emissive CsPbBr3 Perovskite Quantum Dots Embedded in Molecular Organogels

“…Then, in Hx gel spectrum, the most significant bands appear at 3283 cm –1 from N–H stretching, 1697 cm –1 from CO (carboxylic group) and from the amides at 1632 and 1540 cm –1 . [ 9,32 ] In Hx‐PQDs spectrum, the peaks match with the ones in the reference sample with slight variations in the position. Comparing these three samples, a decrease in the relative intensity of the assigned band at 1697 cm –1 in Hx‐PQDs spectrum is observed, which may suggest that there is an interaction that reduces the CO vibrational mode.…”

Luminescent and Robust Perovskite–Silicone Elastomers Prepared by Light Induced Thiol–Ene Reaction

“…Because CsPbBr 3 NCs are thermally unstable and relatively sensitive to moisture, [10,16] the stability of the elastomer composites was studied by monitoring the change in the PL intensity. No obvious reduction in the PL intensity was observed for PSE following storage for 30 days under ambient conditions (Figure 3b), indicating good environmental stability of the luminescent silicone elastomers.…”

“…Moreover, Peng et al blended organometal halide perovskite with urea-containing silicone to obtain luminescent gels showing remarkable stretchability (up to 500%) and enhanced luminescence stability. [10] We previously reported silicone luminescent films prepared by natural sunlight triggered thiol-ene "click" chemistry using d-limonene as a cross-linker. [11] Regrettably, poor mechanical properties of the materials limited the scope of their applications.…”

Advances in the Stability of Halide Perovskite Nanocrystals

“…Stability was demonstrated up to 6 days in environmental conditions. A self-healing polymer matrix was introduced in [159]. Poly(dimethylsiloxane)-urea (PDMS-urea) copolymer was mixed with MAPbBr 3 or MAPbI 3 for producing composites.…”