Tunable dual-emission in Sb3+, Mn2+ codoped rare-earth based Cs2NaYCl6 nanocrystals and its LEDs applications.

Lead-free perovskites are a new type of luminescent material with non-toxic, stability and excellent photoelectric properties, which have great application in the field of photoelectric detection, solar cells, bio-imaging, etc. Here, we reported a new kind of uniform spherical rare-earth based double perovskite Cs 2 NaYCl 6 nanocrystals (NCs) as versatile hosts to accommodate ionic dopants for improving photoelectric properties especially the luminescent properties. In contrast to the low quantum yield of only 5.62%, the luminescent intensity of Cs 2 NaYCl 6 NCs can be impressively enhanced via doping Sb3+ and Mn2+ ions in the rare earth-based double perovskite lattices. For the Sb3+-doping, the photoluminescence quantum yield (PLQY) increases from 5.62% to 22.48%. On this basis, the luminescence colors can be tuned from blue to white and red via Mn2+ ions doping and the maximum PLQY can be further improved to 38.66%. Finally, the Sb3+, Sb3+/Mn2+ ions doped Cs 2 NaYCl 6 NCs based blue, red and white LEDs were explored, which indicates that these are potential materials in multicolor LEDs applications. [ABSTRACT FROM AUTHOR]