All-inorganic RbxCs1-xPbBrI2 perovskite nanocrystals with wavelength-tunable properties for red light-emitting

The outstanding photovoltaic performance of perovskite nanocrystals is attracting more and more attention. However, how to obtain stable wavelength-tunable red light-emitting perovskite materials is an urgent problem to be solved for the photovoltaic application. This paper reports a kind of orange to red light-emitting rubidium-cesium lead halide perovskite nanocrystals (RbxCs1-xPbBrI2, x = 0 to x = 0.6). By adjusting the rubidium-cesium ratios in the precursor solution, the peak wavelength can be tuned from 631 nm to 588 nm. The nanocrystals have narrow emission line-widths and bright photoluminescence. Furthermore, the polymer nanocrystals are prepared simply by mixing PMMA and perovskite nanocrystals solution in appropriate ratios, forming a series of stable orange to red emitting materials.