Mn2+/Cl- synergism of highly stable CsPb(Cl/Br)3: Mn perovskite quantum dots blue light and its light-emitting devices preparation

In comparison to red and green perovskite quantum dots (PQDs), the poor stability and low photoluminescence quantum yield of blue PQDs prevent them from being used in optoelectronic applications. Here, we successfully synthesize CsPb(Cl/Br)3:Mn PQDs through kinetically controlled ion exchange reactions. Mn2+ is partially replaced by Pb2+ when the rigid halide octahedron structure around Pb is opened up by Cl- and Br- halogen exchange. The synergism of the anion Cl- and the cation Mn2+ significantly reduces the flaws of pure PQDs and improves the stability of blue PQDs. The blue photoluminescence (PL) of CsPb(Br/Cl)3:Mn PQDs peaks between 449 and 492 nm. It remains stable for almost three months at room temperature and still has a good luminous capability at 65 degrees C. Moreover, the color coordinates (0.1285, 0.0613) are obtained by using blue CsPb(Br/Cl)3: Mn PQDs. Our work provides an innovative approach for producing high-performance and wide-range adjustable blue LEDs.