Reeba Mary Thomas , Mohd Bilal Khan , Sultan Ahmad , Ankur Mishra , Faheem Ahmed , Abdullah Alsulami , Zishan Husain Khan
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引用次数: 0
Abstract
Doping metal ions into a perovskite lattice is an effective strategy for tailoring the intrinsic properties of perovskite nanocrystals (NCs). Herein, we report the synthesis of red emitting Bi3+ doped CsPbI2Br nanocrystals (NCs) using a one-step ultrasonic irradiation method. Thorough investigations of the effect of Bi3+ doping on the photophysical properties of CsPbI2Br NCs were presented which indicated that the Bi3+ ions can be incorporated at interstitial sites, at substitutional site or at both the sites by carefully optimising the feeding concentration of Bi3+ ions in the precursor solution. Structural studies showed that substitutional doping was observed for 3.4 % Bi3+ doped CsPbI2Br NCs which resulted in the lattice contraction and shortened the bond length of B–X bond, thereby suppressing the distortion of [BX6]4- octahedra of ABX3 perovskite structure, thus, improved the photophysical properties of CsPbI2Br NCs. For 3.4 % Bi3+ doped CsPbI2Br NCs, a reduction in the bandgap and 82 % increase in average PL decay time were observed as compared to that of the pure CsPbI2Br NCs. The prepared Bi-doped CsPbI2Br NCs with tuned bandgap and enhanced optical properties presented here could be used as potential candidate for future photovoltaic applications.
期刊介绍:
Optik publishes articles on all subjects related to light and electron optics and offers a survey on the state of research and technical development within the following fields:
Optics:
-Optics design, geometrical and beam optics, wave optics-
Optical and micro-optical components, diffractive optics, devices and systems-
Photoelectric and optoelectronic devices-
Optical properties of materials, nonlinear optics, wave propagation and transmission in homogeneous and inhomogeneous materials-
Information optics, image formation and processing, holographic techniques, microscopes and spectrometer techniques, and image analysis-
Optical testing and measuring techniques-
Optical communication and computing-
Physiological optics-
As well as other related topics.