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Metal-free ferroelectric halide perovskite exhibits visible photoluminescence correlated with local ferroelectricity.

Taketo HandaRuito HashimotoGo YumotoTomoya NakamuraAtsushi WakamiyaYoshihiko Kanemitsu
Published in: Science advances (2022)
Perovskite materials with tunable electronic and structural characteristics can realize various physical properties including electrical/ionic conduction, ferroelectricity, and luminescence. Integrating and coupling these properties in a single perovskite material offer new possibilities for fundamental research and applications. In particular, coupling ferroelectricity and luminescence would enable novel applications. Here, we report that the metal-free ferroelectric perovskite MDABCO ( N -methyl- N '-diazabicyclo[2.2.2]octonium)-ammonium triiodide exhibits coupled superior ferroelectricity and visible photoluminescence (PL). Besides strong second-harmonic generation (SHG) associated with its ferroelectricity, MDABCO-ammonium triiodide shows long-lifetime PL at room temperature. Remarkably, the PL intensity depends strongly on the polarization of the excitation light. We found that this anisotropy is coupled to the local crystal orientation that was determined by polarization-resolved SHG. Our results suggest that the anisotropic PL property can be tuned in response to its ferroelectric state via an external field and, thereby, presents a previosuly unobserved functionality in perovskites.
Keyphrases
  • room temperature
  • energy transfer
  • ionic liquid
  • quantum dots
  • light emitting
  • solar cells
  • physical activity
  • high intensity