Abstract
Manganese(II)-doped perovskite nanocrystals with superior dual-color light emission properties are promising for optoelectronic applications. Here, we report that the emission color of these nanocrystals can be tailored by continuous-wave excitation because of the saturation of dopant emission at a record low light density (∼10 mW/cm2). By detuning the repetition rates of excitation laser sources, we show that the bottleneck of exciton-manganese(II) energy transfer caused by the imbalanced excitation and deexcitation of 4T1 states is the primary mechanism underlying the emission saturation properties. Such a dual-color luminescence tunable by weak excitation is promising for uses in potential applications such as luminescent solar concentrators, light intensity sensors, anti-counterfeit printing, and photo-switchable image markers.
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