Facile engineering of cesium copper halide composites films with highly ambient stability and tunable optics performance

Facile approaches for the engineering of the nanocrystals, highly ambient stability, environmental friendliness, and remarkable optical performance are key to promote the next generation of fluorescence composites film. Here, all-inorganic low-dimensional cesium copper halide nanocrystals (CCH NCs) is introduced to fabricate metal halide perovskite with room-temperature, ligand-free, gram-scale synthesis strategy. The candidates, CCH NCs, enable engineering with readily and tunable spectral region of 451-551 nm and photoluminescence quantum yields 12-56%, whereby the compositional modulation and individually controlled through halide type and composition. In addition, immobilization substrates polystyrene (PS) is combined with CCH NCs via two-step spin-coating method and enabled composites with excellent optical properties and expanding applications. CCH NCs PS films-function relationships are explored in fluorescence resonance energy transfer and provided responding with rhodamine B (Rh-13). A comprehensive assay of exponential correlation, limit of detection, correlation coefficient reveals their enhanced optics property with Cs3Cu2Cl5 NCs/polystyrene films. These advances set a basis to apply in independently sensors with the addition rhodamine B product and present controlled fashion.