Photoinduced Persistent Polarization Change in a Spin Transition Crystal

Sheng Qun Su, Shu Qi Wu, Yu Bo Huang, Wen Huang Xu, Kai Ge Gao, Atsushi Okazawa, Hajime Okajima, Akira Sakamoto, Shinji Kanegawa, Osamu Sato*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Using light as a local heat source to induce a temporary pyroelectric current is widely recognized as an effective way to control the polarization of crystalline materials. In contrast, harnessing light directly to modulate the polarization of a crystal via excitation of the electronic bands remains less explored. In this study, we report an FeII spin crossover crystal that exhibits photoinduced macroscopic polarization change upon excitation by green light. When the excited crystal relaxes to the ground state, the corresponding pyroelectric current can be detected. An analysis of the structures, magnetic properties and the Mössbauer and infrared spectra of the complex, supported by calculations, revealed that the polarization change is dictated by the directional relative movement of ions during the spin transition process. The spin transition and polarization change occur simultaneously in response to light stimulus, which demonstrates the enormous potential of polar spin crossover systems in the field of optoelectronic materials.

Original languageEnglish
Article numbere202208771
JournalAngewandte Chemie - International Edition
Volume61
Issue number39
DOIs
Publication statusPublished - 2022 Sep 26

Keywords

  • Ion Displacement
  • Photoexcitation
  • Polarization Change
  • Pyroelectric Current
  • Spin Transition

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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