Publication date: 3rd June 2020
Lead halide perovskites have emerged as leading optoelectronic materials in the recent years, owing to their exceptional light emissive properties, they are showing great opportunities for low cost, flexible and high color pure next generation LEDs. Green and red LEDs reached max EQEs over 20%, the blue LEDs, however, are still struggling with EQEs around 10%. In this talk, I am going to discuss the challenges in blue perovskite LEDs and talk about our strategies of doping with metal ion at B site to improve the efficiency of LEDs. We observed a significant increase in the emission quantum yields by doping with Mn2+in blue perovskites, and the devices made by these nanocrystals showed remarkable enhancements, about 30-fold, in their EQEs.1 Further, our studies revealed that the Mn doping benefits are not limited to blue nanocrystals, they showed substantial enhancements in brightness, EQEs and stability of quasi 2D/3D including green and red LEDs.2 Most importantly the sky-blue LEDs took about 20 min until 50% of initial luminance and survived for more than an h without any spectral degradation. Finally, we observed a wide range of dopants that enhances the optical properties of all geometries of perovskites including bulk crystals.
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