Abstract
All-inorganic metal halide perovskite nanocrystals (IPeNCs) have become one of the most promising luminescent materials for next-generation display and lighting technology owing to their excellent color expression ability. However, research on IPeNCs with stable blue emission is limited. In this paper, we report stable blue emissive all-bromide IPeNCs obtained through a modified ligand-assisted reprecipitation method using an ultraviolet (UV)-curable prepolymer as the anti-solvent at a low temperature. We found that the blue emission originates from quantum-confined CsPbBr3 nanoparticles formed together with the colorless wide-bandgap Cs4PbBr6 nanocrystals. When the temperature of the prepolymer was increased from 0 to 50 °C, CsPbBr3 nanoparticles became larger and more crystalline, thereby altering their emission color from blue to green. The synthesized all-bromide blue-emitting IPeNC solution remained stable for over 1 h. It also remained stable when it was mixed with the green-emitting IPeNC solution. By simply exposing the as-synthesized IPeNC–prepolymer solutions to UV light, we formed water-stable composite films that emitted red, green, blue, and white colors. We believe that this synthetic method can be used to develop color-emitting composite materials that are highly suitable for application as the color conversion films of full-color liquid crystal display backlight systems and lighting applications.
Highlights
All-inorganic metal halide perovskite nanocrystals (IPeNCs) with a general formula of CsPbX3 (X = Cl−, Br−, I−) have attracted intense interest for next-generation light-emitting diodes (LEDs) and full-color displays owing to their outstanding optical properties, such as a tunable bandgap, high photoluminescence (PL) quantum yield, and narrow PL linewidths [1,2]
For the first time, we develop emission-wavelength-tunable all-bromidebased IPeNC–polymer composite films obtained through a modified Ligand-assisted reprecipitation (LARP) synthesis method using a UV-curable prepolymer as the anti-solvent
The measured PL quantum yields (PLQYs) values of prepolymer-0, prepolymer-25, prepolymer-50, and toluene-25 are 29%, 57%, 38%, and 40%, respectively. These results indicate that blue-emitting (465 nm) IPeNCs with a PLQY of 29% were successfully synthesized by our modified LARP method using the prepolymer as the anti-solvent
Summary
All-inorganic metal halide perovskite nanocrystals (IPeNCs) with a general formula of CsPbX3 (X = Cl−, Br−, I−) have attracted intense interest for next-generation light-emitting diodes (LEDs) and full-color displays owing to their outstanding optical properties, such as a tunable bandgap, high photoluminescence (PL) quantum yield, and narrow PL linewidths [1,2]. Ligand-assisted reprecipitation (LARP) and hot injection (HI) methods have been widely used to synthesize IPeNCs. The HI method has several obvious drawbacks for commercialization, such as the need for a high temperature, vacuum, and inert atmosphere. LARP is a simpler approach that can be conducted under an air atmosphere at relatively low temperatures; it is more convenient for large-scale production [3]. Four main strategies have been pursued to develop blue-emitting IPeNCs [4,5]. The most widely used approach is the use of a mixed Br/Cl halide composition to obtain CsPbBrxCl3–x
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