Adding Barium Thiocyanate to CsPbBr₃ Perovskite Nanocrystals for Better WLEDs

The potential of all-inorganic cesium lead bromide (CsPbBr₃) perovskites as promising emitters has gained significant attention in the development of solid-state lightings and displays technology. Engineering the composition of ions in perovskite structure controls the characteristics of the material, including bandgap, morphology, and electronic properties. However, few reports have dealt with the effect of simultaneous doping at the Pb²⁺ and Br⁻ lattice sites. This report summarizes the impact of Ba(SCN)₂ (with Ba²⁺ and SCN⁻ as a substituent to Pb²⁺ and Br⁻, respectively) on the optoelectronic performance of CsPbBr₃ nanocrystals (NCs). The experimental results demonstrated that the combined effect of Ba²⁺ and SCN⁻ enhances the optical performance of materials, primarily the photoluminescence quantum yield (~98%) and long-term stability towards air and moisture, due to the mitigation of non-radiative radiative centers. Implications of color-tunable NCs over a novel 3D-printed multiplex design result in white light-emitting diodes with a characteristic correlated color temperature of 6764 K and a color rendering index of 87.