Metal organic frameworks (MOFs) contain ordered pores capable of encapsulating varied types of guests and provide a platform to expand the flexibility and versatility of the host-guest composites. Herein, by encapsulating CH3NH3PbBr3 NPS into Ln-MOFs (Ln = La, Nd, Pr, Sm), four CH3NH3PbBr3@Ln-MOFs host-guest composites were fabricated and served as a bifunctional platform. The temperature-dependent luminescence properties of the CH3NH3PbBr3@Ln-MOFs were explored and the results revealed their tuneable green luminescence performance. In particular, the CH3NH3PbBr3@Sm-MOF exhibits a variety of colours from green to blue to purple and an excellent quantum yield of 0.98. The photocurrent responses and theoretical calculations reveal the enhancement mechanism of CH3NH3PbBr3 on charge-hole separation owing to its unique host-guest synergy. Moreover, the CH3NH3PbBr3@Sm-MOF exhibits the excellent electrical bi-stability with a high ON/OFF ratio of 104. Hence, the CH3NH3PbBr3@Ln-MOFs host-guest composites are promising candidates for a new generation of photovoltaic, light-emitting, and switching memories devices.
Citation
Zhao, L., Redshaw, C., Ding, K., Zhang, P., Chen, B., Chen, Z., Hu, J., & Li, H. (2023). Host-Guest Synergy of CH3NH3PbBr3@Ln-MOFs Enabling Tunable Green Luminescence and Switchable Memory. Applied Surface Science, 614, Article 156082. https://doi.org/10.1016/j.apsusc.2022.156082
