Encapsulation of perovskite quantum dots into a LnIII-incorporating polymer matrix to achieve white light emission

Abstract

All-inorganic perovskite quantum dots (PQDs) with high quantum efficiency and broad spectral tunability showing potential applications in light-emitting diodes (LEDs) are promising luminescent materials. However, poor stability has also become a major challenge limiting their applications. Herein, we have used Ln^III-incorporating polymers (red light, green light emission) obtained by copolymerization of terpyridine-based Ln^III complexes with methyl acrylate (MA) as an encapsulation matrix for CsPbCl_1.5Br_1.5 QDs (blue light emission) to obtain composite films with high pure bright white light emission with CIE color coordinates of (319, 0.329). The encapsulated CsPbCl_1.5Br_1.5 QDs showed excellent stability, maintaining 64% of the original emission after 21 days in air, while the unencapsulated quantum dots dropped to 4% of the original emission. This approach not only effectively improves the environmental stability of PQDs, but also solves the fluorescence reabsorption phenomenon that tends to occur in multi-color co-mixed white light. This strategy of encapsulating PQDs with a Ln^III-incorporating polymer matrix provides an interesting and effective approach for achieving stable white light emission.