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All-inorganic lead halide perovskite nanocrystals (NCs) show potential inoptoelectronic devices, though their stability and efficiency have yet toimprove. In this work, we explore the effect of bivalent metal site doping onthe optoelectronic properties of CsPbX$_3$ (X = Br, Cl) perovskite NCs. First,the Pb$^{2+}$ ions in pristine CsPbBr$_3$ NC are partially substituted byMn$^{2+}$ ions, and the alkaline earth metal strontium is then doped on bothpristine and Mn$^{2+}$-substituted particles. The structural and photophysicalproperties of the pristine and the three doped NC variants have beeninvestigated experimentally as well as exploiting first principlescalculations. We found that a small percentage of Sr$^{2+}$-doping improved thephotoluminescence quantum yield of the pristine particle by 8%, while itimproved the Mn$^{2+}$-state emission by 7%. Perovskite NC film/poly(methylmethacrylate) composites with all four NC variants were used in a whitelight-emitting diode (WLED) and again both Sr$^{2+}$ doped NCs were found toincrease the luminous efficiency of the WLED by ca 4 %. We attribute thisperformance enhancement to a reduced defect density as well as an attenuatedmicrostrain in the local NC structure.

Improvement of Photophysical Properties of CsPbBr$_3$ and  Mn$^{2+}$:CsPb(Br,Cl)$_3$ Perovskite Nanocrystals by Sr$^{2+}$ Doping and  Their Application in White-LEDs