Influence of PMMA thin film combined with Mn-doped cesium lead halide perovskite CsPbCl3

To improve the stability and enable luminescent devices, especially in moisture and oxygen atmosphere, Cesium lead Halide perovskite nanocrystals (PNCs) are usually encapsulated by polymer host matrices as the highly effective emission center. However, simple PNCs are facing matrix absorption and reabsorption of PNCs in bulk structure or film structures. To solve these problems, we introduced a thin film structure made of Polymethylemthacrylate (PMMA) that incorporated into Mn-doped CsPbCl3 PNCs on silica substrate. The enlargement in Stocks shift (about 200 nm) of PNCs has effectively reduced the reabsorption between different PNCs. Two types of PNCs nanostructure (nanocube and nanoplatelet) were prepared. To figure out the influence of PNCs nanostructure and PMMA ratio, series of samples were prepared and compared on their optical performance including photoluminescence (PL) intensity spectra, photoluminescence excitation (PLE) spectra, absorption spectra and temperature dependent PL spectra. Such a thin PMMA film with Mn-doped PNCs has great stability on emission wavelength during the change of PMMA ratio and temperature, which is promising for the uses in potential application such as luminescent solar concentration on glass window.