Here we report the room-temperature, atmospheric synthesis of Mn-doped cesium lead halide (CsPbX) perovskite quantum dots (QDs). The synthesis is performed without any sort of protection, and the dual-color emission mechanism is revealed by density functional theory. The Mn concentration reaches a maximum atomic percentage of 37.73 at%, which is significantly higher in comparison to those achieved in earlier reports via high temperature hot injection method. The optical properties of as-prepared nanocrystals (NCs) remain consistent even after several months. Therefore, red-orange LEDs were fabricated by coating the composite of PS and as-prepared QDs onto ultraviolet LED chips. Additionally, the present approach may open up new methods for doping other ions in CsPbX QDs under room temperature, the capability of which is essential for applications such as memristors and other devices.

Perovskite quantum dots with excellent optical properties and robust durability stand as an appealing and desirable candidate for fluorescence resonance energy transfer (FRET) based fluorescence detection, a powerful technique featuring excellent accuracy and convenience. In this work, a monolithic superhydrophobic polystyrene fiber membrane with CsPbBr3 perovskite quantum dots encapsulated within (CPBQDs/PS FM) was prepared via one-step electrospinning. Coupling CPBQDs with PS matrix, this CPBQDs/PS FM composite exhibits high quantum yields (∼91%), narrow half-peak width (∼16 nm), nearly 100% fluorescence retention after being exposed to water for 10 days and 79.80% fluorescence retention after 365 nm UV-light (1 mW/cm2) illumination for 60 h. Thanks to the outstanding optical property of CPBQDs, an ultralow detection limit of 0.01 ppm was obtained for Rhodamine 6G (R6G) detection, with the FRET efficiency calculated to be 18.80% in 1 ppm R6G aqueous solution. Electrospun as well-designed fiber membranes, CPBQDs/PS FM composite also possesses good tailorability and recyclability, showing exciting potential for future implementation into practical applications.

Electrospun PMMA fiber membrane encapsulated with CsPbBr3 exhibits excellent FRET detection performance on trypsin, Cu2+ and pH.

We have firstly prepared CsPbBr3@SiO2 nanocomposites with a spherical morphology and diameters less than 125 nm via confined condensation into polystyrene. The obtained CsPbBr3@SiO2 exhibits high stability in polar solvents and can be used as a solution-processable luminescent ink.

We prepare a series of two-dimensional (2D) tin-based perovskite (RNH 2 ) 2 SnBr 4 with different carbon chains. All of them have extra-large Stokes shifts, broad emission, and ultralong PL lifetimes. The PLQYs of (C 8 H 17 NH 2 ) 2 SnBr 4 and (OAm) 2 SnBr 4 powders reach up to 54 and 60%, respectively. Density functional theory calculations and experimental results reveal that the properties of 2D Sn-based perovskites may originate from self-trapped excitons, which result from excited-state structural deformation. The results show that the [SnBr 6 ] 4− octahedron distorted by the carbon chain with arrangement distortion changes the photophysical properties of 2D tinbased perovskite. Furthermore, (OAm) 2 SnBr 4 powders are used to engineer UV pumped light-emitting diodes. This work provides new strategies for the preparation of environmentally friendly perovskite materials.