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Currently,lead halide perovskite quantum dots(PeQDs)have attracted great attention due to their spectacular photophysical properties.However,the toxicity of Pb2+heavy metal ions in CsPbX3 PeQDs limits their practical applications.Herein,a facile post-treatment doping method is proposed,which enables the preparation of highly luminescent low-toxic CsPbXa;Mn2+PeQDs from nonluminescent Cs4PbXe PeQDs at water interface.The monodispersed CsPbX3:Mn2+PeQDs exhibit excellent photophysical properties,including high photoluminescence quantum yield up to 87％.The reaction process and doping mechanism are deeply explored through in-situ monitoring.By simply adjusting the halide composition of the original Cs4PbXe PeQDs or Mn doping concentration,a series of CsPbX3:Mn2+PeQDs with adjustable emission could be obtained.Further,the CsPbX3:Mn2+Q-LED was fabricated and exhibited excellent orange light with the color coordinates of(0.564,0.399),correlated color temperature(CCT)of 1,918 K,and luminous efficiency(LE)of 24 Im/W,which illustrate the great promise in light emitting diode(LED)applications.This work not only provides a facile method for the preparation of highly luminescent low-toxic CsPbX3:Mn2+PeQDs,but also provides insights into the mechanism of doping process.