UV Resin Enhanced Stability of Metal Halide Perovskite Nanocrystals for White Light-Emitting Diodes

The long-term stability issue of metal halide perovskite nanocrystals (NCs) is one of the challenges for applications in optoelectronic devices. Herein, we demonstrate the enhanced air, moisture, and light stability of these NCs by encapsulation in UV resin (UVR). As-prepared perovskite NCs-UVR composites exhibit well maintained optical properties. In addition, the composites show excellent stability with almost identical luminescent behavior for more than 60 days upon continuous exposure in air, moisture, and light irradiation, which is superior to the other previous reports. Moreover, we have used these green- and red-emitting composite sheets to fabricate white light-emitting diodes (LEDs) by stacking them on top of the blue LED. We observed a bright neutral white light with a correlated-color temperature of 5623 K, a color-rendering index of 85, and a high luminous efficacy of radiation (similar to 349 lm/W). Our findings show the great potential of employing this technique for diverse photonic applications.