Random lasing actions from plasmon-perovskite hybrid configurations
Tsung Sheng KAO1*, Yu-Heng HONG1, Yi-Cheng SU1, Yu-Kai CHENG1, Hung-Hsiao KUO1, Han CHIAO1, Yi-Ling SIE1
1Department of Photonics, National Chiao Tung University, Hsinchu, Taiwan
* Presenter:Tsung Sheng KAO, email:tskao@nctu.edu.tw
The exciton dynamics in organometal halide perovskites exhibit the significant excitonic properties of large exciton binding energy, suggesting that the nanocrystalline perovskites can be one of the most promising optical gain materials and may be used as advanced light-emitting devices operated at ambient environment. In this work, we applied the developed solvent-engineering produce and demonstratee that the improved lasing action can be acquired from a hybrid configuration of perovskite nanocrystals and plasmonic nanoparticles. The excitation power threshold for low-temperature lasing action in perovskites can be reduced by over two orders of magnitude than that acquired in bare perovskite layers, ascribing to the strong exciton-plasmon coupling between the plasmonic nanostructures and perovskite materials. Regarding the practical applications, we also demonstrate the flexible perovskite lasers and their functionalities such as the imaging and actively-controlled lasing emission performance. We observe the room-temperature random lasing action in curved perovskite thin films, while the curved perovskite random lasers exhibit low spatial coherence and excellent image quality without speckle. Furthermore, the improved light emission is not only observed in the perovskite nano thin films, but also may be acquired in the solution-processed perovskite at different structural dimensionalities, such as the perovskite quantum dots and the single-crystalline perovskite bulks.

Keywords: organometal halide perovskite, exciton-plasmon coupling, plasmonic resonance energy transfer, random lasing action, solution-processed