Abstract
Lead halide perovskite nanoplates support strongly quantum confined excitons, high photoluminescence quantum yield, fast and narrow photoluminescence spectra. Future use of these nanomaterials is strongly dependent on the ability to enhance their stability and engineer the out-coupling of excitonic emission. Optical waveguides can harness their attractive optical properties enabling integration into photonic devices and preventing degradation. In this study we activate planar polymer waveguides of poly(styrene-ethylene-butylene-styrene) with colloidally synthesized CsPbBr3 nanoplates and study interactions between perovskite confined excitons and the optical waveguide modes. Beyond optical engineering, the polymer forming the waveguide serves also to encapsulate the perovskite nanocrystals, protecting them from the environment. Angle-dependent photoluminescence measurements indicate coupling between the quantum confined excitons in the nanoplates and the planar guided modes. This is evident by the emission of photons with momenta and polarization states matching those of the guided modes. We achieve an order of magnitude shortening of the emission lifetime via Purcell effect. Achieving fast emission from perovskite nanoplate activated waveguides is of interest in the context of searching for an efficient and coherent single photon source. These findings can serve as a first engineering step in the direction for a more complex nanoperovskite waveguide based photonic structure.
Original language | English |
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Pages (from-to) | 2329-2336 |
Number of pages | 8 |
Journal | ACS Photonics |
Volume | 7 |
Issue number | 9 |
DOIs | |
State | Published - 16 Sep 2020 |
Keywords
- Purcell effect
- colloidal nanocrystals
- confined excitons
- oriented emission
- weak coupling
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering
- Biotechnology