Strategies to Extend the Lifetime of Perovskite Down-conversion Films for Display Applications.

Metal halide perovskite nanocrystals (PeNCs) have outstanding luminescent properties that are suitable for displays that have high color purity and high absorption coefficient; so they have been evaluated for application as light emitters for organic light-emitting diodes (OLEDs), light converters for down-conversion displays, and future near-eye augmented reality/virtual reality displays. However, PeNCs are chemically vulnerable to heat, light, and moisture, and these weaknesses must be overcome before devices that use PeNCs can be commercialized. This review examines strategies to overcome the low stability of PeNCs and thereby permit the fabrication of stable down-conversion films, and summarizes down-conversion-type display applications and future prospects. First, we examine methods to increase the chemical stability of PeNCs. Second, we review methods to encapsulate PeNC down-conversion films to increase their lifetime. Third, we summarize methods to increase the long-term compatibility of resin with PeNCs, and finally, how to secure stability using fillers added to the resin. Fourth, we then describe the method to manufacture down-conversion film and the procedure to evaluate their reliability for commercialization. Finally, we explore the prospects of a down-conversion system that exploits the properties of PeNCs and can be eventually employed to fabricate very fine patterns for high-resolution displays and for near-eye augmented reality (AR)/virtual reality (VR) devices. This article is protected by copyright. All rights reserved.