Abstract
Metal halide perovskite nanocrystals (NCs) attract much attention for light-emitting applications due to their exceptional optical properties. More recently, perovskite NCs have begun to be considered a promising material for nonlinear optical applications. Numerous strategies have recently been developed to improve the properties of metal halide perovskite NCs. Among them, B-site doping is one of the most promising ways to enhance their brightness and stability. However, there is a lack of study of the influence of B-site doping on the nonlinear optical properties of inorganic perovskite NCs. Here, we demonstrate that Cd2+ doping simultaneously improves both the linear (higher photoluminescence quantum yield, larger exciton binding energy, reduced trap states density, and faster radiative recombination) and nonlinear (higher two- and three-photon absorption cross-sections) optical properties of CsPbBr3 NCs. Cd2+ doping results in a two-photon absorption cross-section, reaching 2.6 × 106 Goeppert-Mayer (GM), which is among the highest reported for CsPbBr3 NCs.
Highlights
Doping of cesium lead halide perovskites has become a novel approach to tuning their optoelectronic properties and enhancing their stability [1,2,3,4]
B-site doping is considered a new approach to achieving better characteristics of devices based on perovskite NCs, and that was demonstrated for CsPbBr3 NCs, which are important nanomaterials to produce green-emitting light-emitting diodes (LEDs) [12,13,14,15,16,17]
The morphology and crystal structure of the as-synthesized CsPbBr3 NCs and Cd2+ doped CsPbBr3 (CsPb0.78 Cd0.22 Br3, the element content was confirmed by X-ray photoelectron spectroscopy) NCs were investigated by transmission electron microscopy (TEM)
Summary
Doping of cesium lead halide perovskites has become a novel approach to tuning their optoelectronic properties and enhancing their stability [1,2,3,4]. Doping may enhance their luminosity and promote charge carrier transport and crystal phase stabilization [2]. B-site doping is considered a new approach to achieving better characteristics of devices based on perovskite NCs, and that was demonstrated for CsPbBr3 NCs, which are important nanomaterials to produce green-emitting light-emitting diodes (LEDs) [12,13,14,15,16,17]. The doping may facilitate better environmental stability of the device [18] and optimization of the energy band diagram [23]
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