Excitation-Dependent Emission Color Tuning from an Individual Mn-Doped Perovskite Microcrystal

Divalent manganese cation (Mn2+) doped perovskite materials are of great interests for their unique optical, magnetic and electric properties. Herein, we report an excitation-dependent emission color tuning from an individual Mn-doped CsPbCl3 microcrystals (MCs) with a wide color tuning range, reversible and continuous color change and high photostability. We demonstrate that the Mn-doped CsPbCl3 MCs exhibit dual-color emission from both host excitons (blue) and Mn-dopants (orange) through an internal energy transfer (IET) process. By simply changing the laser excitation repetition rate or pulse intensity, the relative emission intensity between exciton (Iexciton) and Mn-dopant (IMn) can be continuously and reversibly tuned from IMn/Itotal (Itotal = IMn + Iexciton) = 0.9 ~ 0.8 to 0.1 ~ 0.2, corresponding to a color change from orange to blue. Such emission color tuning is enabled by the saturation of Mn-dopant emission at high excitation intensity and a linear dependence of exciton emission with excitatio...