Boosting photoluminescence efficiency and stability of Mn2+ doped CsPbCl3 perovskite nanocrystals via europium ion codoping☆

ABSTRACT Mn 2+ doped CsPbCl 3 (Mn 2+ :CsPbCl 3 ) nanocrystals (NCs) have attracted considerable attention due to their unique strong and broad orange-red emission band, presenting promising applications in the field of photoelectric devices. However, pristine Mn 2+ :CsPbCl 3 NCs commonly suffer from low photoluminescence quantum yield (PL QY) and stability issues. Herein, we introduced europium ions (Eu 3+ ) into Mn 2+ :CsPbCl 3 NCs via the thermal injection synthesis method to obtain high performance Eu 3+ and Mn 2+ codoped CsPbCl 3 (Eu 3+ /Mn 2+ :CsPbCl 3 ) NCs. The maximum PL QY of the resulting Eu 3+ /Mn 2+ :CsPbCl 3 NCs reaches up to 90.92%. It is found that the doping of Eu 3+ ions significantly reduces the non-radiative recombination caused by high defect states, and improves the energy transfer efficiency from exciton to Mn 2+ , thereby boosting the PL performance. Moreover, doping Eu 3+ ions notably improves the UV-light and water stability of Mn 2+ :CsPbCl 3 NCs. We further demonstrate the application versatility of Eu 3+ /Mn 2+ :CsPbCl 3 NCs in white light emitting diodes (WLEDs) and optical anti-counterfeiting applications. This work provides a valuable perspective for the attainment of high performance Mn 2+ :CsPbCl 3 NCs and lays a foundation for the codoping of other lanthanide ions to adjust the luminescence properties of Mn 2+ :CsPbCl 3 NCs.