Achieving high transparency and stable luminescence in CsMnBr3 nanocrystals embedded glass

In this study, Pb²⁺-doped CsMnBr₃ NCs are precipitated in borosilicate glass using a facile solid-phase process. The oxidation of Mn²⁺ to Mn³⁺ is effectively suppressed in the presence of modicum iron powder for the first time, resulting in a high transmittance of 80 % in the entire visible range and eliminating the reabsorption-induced energy loss for the CsMnBr₃:Pb@glass composite. Owing to the enhanced absorption and weakened magnetic coupling between Mn−Mn pairs via Pb²⁺ ion doping, the optimum CsMnBr₃:10 %Pb@glass emits intense orange-red light peaking at 645 nm with a record PLQY of 69.5 %, which is 5.4 times that of undoped counterpart. Furthermore, CsMnBr₃:10 %Pb@glass demonstrates robust water and thermal-quenching resistances. Interestingly, the color of CsMnBr₃@glass progressively changes from pink to cyan and green upon mechanical grinding with Pb²⁺ source, yielding a blueshift of the emission peak to 500 and 514 nm triggered by the phase transition of CsMnBr₃ to CsPbBr₃.