One-Step Synthesis of FA-Directing FAPbBr₃ Perovskite Nanocrystals toward High-Performance Display

Abstract

Hybrid organic-inorganic and all-inorganic metal halide perovskite nanocrystals (PNCs) have aroused extensive attention from both academic and industrial researchers, considering their excellent performance in optoelectronic applications. Herein, we develop a facile and time-saving strategy to synthesize NHCH═NHPbBr (NHCH═NH, FA) PNCs at room temperature. Benefiting from this facile method, high-quality FAPbBr PNCs with photoluminescence quantum yield up to 76% and narrow full width at half-maxima of 20 nm can be produced on a large scale. Moreover, anion-exchange reactions run by using FAPbBr as a template, producing various PNCs with different anion constituents. By manipulating the ratios of two different anions, a series PNCs with various bright photoluminescence ranging from 452 to 646 nm could be done. On account of superior and adjustable photoluminescence over the visible spectral region, FAPbBr PNCs can be applied as a promising color-converting material in liquid-crystal display (LCD) backlight, white light-emitting diode (WLED), and inkjet printing pattern. As a proof of concept, FAPbBr PNCs with green emission were integrated in WLED and LCD backlight, accomplishing a color rendering index of 87.5 and a wide color gamut of 116%, respectively.

Ten‐Gram‐Scale Synthesis of FAPbX3 Perovskite Nanocrystals by a High‐Power Room‐Temperature Ultrasonic‐Assisted Strategy and Their Electroluminescence

“…X‐ray diffraction (XRD) measurement is performed to illuminate the phase structure. Figure 1b shows the XRD patterns of FAPbBr 3 NCs, the two characteristic peaks at around 14.8° and 30.0° are assigned to the (100) and (200) crystal face of cubic FAPbBr 3 phase, which is consistent with the literature reports . Transmission electron microscopy (TEM) displayed in Figure 1c demonstrates prepared FAPbBr 3 NCs have a cubic shape and the uniform size distribution with the average size of ≈12.2 nm.…”

“…On the other hand, tremendous efforts have been devoted to preparing perovskite NCs via hot‐injection approach, ligand‐assisted reprecipitation (LARP) method and the others . The hot‐injection approach requires an anhydrous and oxygen‐free environment at high temperature rendering a trivial and complicated operation .…”

“…The hot‐injection approach requires an anhydrous and oxygen‐free environment at high temperature rendering a trivial and complicated operation . In addition, as a result of strong ionic nature in the perovskite NCs, this reaction must be rapidly terminated after injecting precursors through an ice bath cooling process, which may result in poor quality control and hinder the mass production . For the LARP, the dimethylformamide or dimethyl sulfoxide usually acts as polar solvent in the reaction system .…”

Nonradiative Energy Transfer through Distributed Bands in Piezochemically Synthesized Cesium and Formamidinium Lead Halide Perovskites

“…Here, the peaks at 15.05°, 21.48°, 30.63°, 33.96°, 37.92°, 44.10°, and 48.55° are in agreement with the (100), (110), (200), (210), (211), (220) and (310) crystal planes, respectively. Similarly, the FAPbBr 3 sample is in the cubic phase with the diffraction peaks at 14.80°, 21.60°, 30.50°, 33.84°, 37.92°, 40.89°, and 44.22°, which correspond to the (100), (110), (200), (210), (211), (220) and (300) crystal planes, respectively . Small amounts of unreacted precursors, which show characteristic XRD peaks, are also present.…”

“…The diffraction peaks of CsPbBr 3 are assigned to the cubic Pm3m crystal phase, according to the literature, [4c] and the standard ICSD card no #29073.H ere, the peaks at 15.058, 21.488,3 0.638,3 3.968,3 7.928,4 4.108,a nd 48.558 are in agreement with the (100), (110), (200), (210), (211), (220) and( 310) crystal planes, respectively.S imilarly,t he FAPbBr 3 sample is in the cubic phase with the diffraction peaks at 14.808,2 1.608, 30.508,3 3.848,3 7.928,4 0.898,a nd 44.228,w hich correspond to the (100), (110), (200), (210), (211), (220) and (300) crystal planes,r espectively. [9] Small amounts of unreacted precursors, which show characteristic XRD peaks, are also present. As the references, the XRD patterns of the precursors are shown in Figure2a( it oi ii).…”