Abstract
In this study, facile synthesis, characterization, and stability tests of highly luminescent Zn-doped CsPbBr3 perovskite nanocrystals (NCs) were demonstrated. The doping procedure was performed via partial replacement of PbBr2 with ZnBr2 in the precursor solution. Via Zn-doping, the photoluminescence quantum yield (PLQY) of the NCs was increased from 41.3% to 82.9%, with a blue-shifted peak at 503.7 nm and narrower spectral width of 18.7 nm which was consistent with the highly uniform size distribution of NCs observed from the TEM image. In the water-resistance stability test, the doped NCs exhibited an extended period-over four days until complete decomposition, under the harsh circumstances of hexane-ethanol-water mixing solution. The Zn-doped NC film maintained its 94% photoluminescence (PL) intensity after undergoing a heating/cooling cycle, surpassing the un-doped NC film with only 67% PL remaining. Based on our demonstrations, the in-situ Zn-doping procedure for the synthesis of CsPbBr3 NCs could be a promising strategy toward robust and PL-efficient nanomaterial to pave the way for realizing practical optoelectronic devices.
Highlights
Accepted: 23 February 2022Motivated by their promising applications in optoelectronics, synthesis techniques of organic-inorganic hybrid and all-inorganic lead halide perovskites (AILHPs) in forms of powder and nanocrystals (NCs) with improved characteristics have gained remarkable developments in the last decade [1,2,3,4,5,6,7,8]
Quaternary alkylammoniums such as tetraoctylammonium bromide (TOAB) and di-dodecyl dimethyl ammonium bromide (DDAB) were introduced in-situ or post-synthesis to partially replace the ligand of fatty
transmission electron microscope (TEM) and high-angle annular dark field scanning TEM (HAADF-STEM) images of the CsPbBr3 and CsPbBr3 :Zn NCs are shown in Figure 1 and Figure S1
Summary
Motivated by their promising applications in optoelectronics, synthesis techniques of organic-inorganic hybrid and all-inorganic lead halide perovskites (AILHPs) in forms of powder and nanocrystals (NCs) with improved characteristics have gained remarkable developments in the last decade [1,2,3,4,5,6,7,8] Despite those astonishing breakthroughs, e.g., the ultrahigh power conversion efficiency in solar cells and theoretically high external quantum efficiency in perovskite light-emitting diodes (PeLEDs) [2,3], the transition of halide perovskite devices from the laboratory into commercial products has been greatly hindered by their poor stabilities and phase transition/deformation tendencies [9,10]. Quaternary alkylammoniums such as tetraoctylammonium bromide (TOAB) and di-dodecyl dimethyl ammonium bromide (DDAB) were introduced in-situ or post-synthesis to partially replace the ligand of fatty
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