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Delicate engineering of chromaticity is required to faithfully reproduce colors in a backlit display, this is extremely difficult for green downconverters because the human eye is highly sensitive to green colors. The central challenge is to achieve finely tunable green emissions in the narrow range of 525-535 nm while keeping the full width at half maximum (FWHM) <25 nm at the same time. Here, a room-temperature ion-exchange-mediated self-assembly strategy for preparing FAPbBr 3 (FA = CH(NH 2 ) 2 + ) nanoplates (NPs) to fulfill this goal is introduced. 2D layered OA 2 PbBr 4 (OA is octadecylamine) NPs are first synthesized by spontaneous reprecipitation, and are then transformed into FAPbBr 3 NPs through a OA + -to-FA + exchange induced self-assembly of HP monolayers. A c-axis contraction in this process makes a relative large thickness variation in OA 2 PbBr 4 NPs, which can be realized by simply varying the precursor concentration, only result in a small thickness change in subsequent FAPbBr 3 NPs, thereby enabling finely tunable emissions in the range of 525-535 nm along with FWHM <25 nm and a quantum yield up to 85%. As a downconverter, the FAPbBr 3 NPs realize an ultrapure green backlight that covers ≈95% Rec. 2020 standard in the CIE 1931 color space.

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Wound infection can cause a delay in wound healing or even wound deterioration, threatening patients' lives. The excessive accumulation of reactive oxygen species (ROS) in infected wounds activates a strong inflammatory response to delay wound healing. Therefore, it is highly desired to develop hydrogels with inherent antimicrobial activity and antioxidant capability for infected wound healing. Herein, a dopamine-substituted multidomain peptide (DAP) with inherent antimicrobial activity, strong skin adhesion, and ROS scavenging has been developed. DAP can form bilayer β-sheets with dopamine residues on the surface of nanofibers. The enhanced rheological properties of DAP-based hydrogel can be achieved not only through UV irradiation but also by incorporation of multivalent ions (e.g., PO 4 3− ). Furthermore, the DAP hydrogel shows a broad spectrum of antimicrobial activity due to the high positive charges of lysine residues and the βsheet formation. When applied to full-thickness dermal wounds in mice, the DAP hydrogel results in a significantly shortened inflammatory stage of the healing process because of its remarkable antimicrobial activity and antioxidant capability. Accelerated wound closure with thick granulation tissue, uniform collagen arrangement, and dense vascularization can be achieved. This work suggests that the DAP hydrogel can serve as antimicrobial coating and ROS-scavenging wound dressing for bacterial-infected wound treatment.