We investigated the effect of the partial replacement of Pb2+ with Mg2+ in CsPbX3 (X-halides) on photophysical properties and their potential applications in light-emitting diodes (LEDs). The new composites exhibited a slight variation in the lattice dimension without altering their structure and morphology. However, the replacement of Pb2+ with Mg2+ imparted enhancement in photoluminescence and bandgap energies with maintaining the high luminous property. As a result, the application of these nanocrystals as the color conversion layers (3D printing-based design) in the fabrication of white LEDs generated white light with excellent color characteristics.
The introduction of non-toxic guest cations (zinc, Zn2+) in the synthesis of CsPbX3 NCs leads to the realization of lead-reduced CsPb1-xZnxX3 NCs, confirming the substitution of Pb2+ up to 15%. As-synthesized NCs exhibits lattice contraction accompanied by increased bandgap, blue-shifted photoluminescence emissions, and high quantum yield. Besides, the blue, green, yellow, and red-emitting CsPb1-xZnxX3 NCs (at x=15%) obtained by adjusting the composition of different halides when used as color conversion layers emits warm to cool white light with remarkable color qualities. Notably, this development will promote the halide perovskite NCs one step closer to their practical applications.