Preparing method and application of orthorhombic phase cesium-lead iodide monocrystal nanowire

Abstract

The invention discloses a preparing method and application of an orthorhombic phase cesium-lead iodide monocrystal nanowire. The preparing method comprises the steps of adding lead iodide to gamma-butyrolactone which is in a protective atmosphere and under stirring at the temperature of 68.5-72.5 DEG C, so that brick red turbid solution is obtained; then adding cesium iodide to the brick red turbid solution to obtain mixed solution; placing the mixed solution in a protective atmosphere at the temperature of 68.5-72.5 DEG C to be stirred constantly for at least 80 min to obtain luminous yellow mixed solution; cooling the luminous yellow mixed solution, and placing the luminous yellow mixed solution in an environment with relative humidity smaller than or equal to 20% and temperature of 68.5-72.5 DEG C to be evaporated to dryness, so that the orthorhombic phase cesium-lead iodide monocrystal nanowire is obtained, wherein the single crystal growth direction of the nanowire is <100>, wire diameter is 0.1-0.15 micron, and wire length is larger than or equal to 100 microns. The nanowire can serve as a basic unit to build a nanowire device or nanowire array device, and can generate X-ray fluorescence of 464+ / -10 and 564+ / -10 nm under the excitation of X rays. The nanomwire is expected to be widely applied to making of nanophotonics basis units, photoelectric detectors, high-energy ray detection and the like.

Description

technical field [0001] The invention relates to a preparation method and application of a single crystal nanowire, in particular to a preparation method and application of an orthorhombic cesium lead iodide single crystal nanowire. Background technique [0002] Cesium lead iodide (CsPbI 3 ) has two crystal structures, which are perovskite structure stable at high temperature and orthorhombic phase structure stable at room temperature. The one-dimensional structure of cesium lead iodide nanowires has excellent luminescence characteristics and has achieved high-quality laser output; in addition, its one-dimensional charge directional conduction characteristics also make it convenient to construct high-efficiency photodetector devices. Therefore, people have made unremitting efforts to obtain cesium lead iodide nanowires in the orthorhombic phase, such as entitled "Solution-PhaseSynthesis of Cesium Lead Halide Perovskite Nanowires", Am.Chem.Soc., 2015, 137(29), 9230-9233 (“So...

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Problems solved by technology

Although this product can produce green fluorescence under the excitation of 320nm light, it and its preparation method have shortcomings. First, the length of the product is too short, only a few microns, which is not conducive to being used in full-band light-emitting and display devices; Secondly, there are too many reactants involved in the preparation method, up to 8 kinds, and the reaction temperature is too high. At the same time, it is necessary to use several raw materials to synthesize intermediate reactants as precursors for further chemical reactions. The complexity of the technology and parameters The control requirements are very high, which is extremely unfavorable for industrial scale production

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