Planar Optical Waveguides Using Poly(styrene-ethylene-butylene-styrene) Activated with Inorganic Lead Halide Perovskite Nanoplates

Tsafrir Abir, Reut Shechter, Tal Ellenbogen, Yehonadav Bekenstein

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
Pages (from-to)2329-2336
Number of pages8
JournalACS Photonics
Volume7
Issue number9
DOIs
StatePublished - 16 Sep 2020

Keywords

  • Purcell effect
  • colloidal nanocrystals
  • confined excitons
  • oriented emission
  • weak coupling

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