Extremely large electro-optic effect of TPPS J-aggregates in the PVA or PVP polymer matrix and aqueous solution

Kazuaki Nakata; Takayoshi Kobayashi; Eiji Tokunaga

doi:10.1039/d2cp00427e

Extremely large electro-optic effect of TPPS J-aggregates in the PVA or PVP polymer matrix and aqueous solution

Phys Chem Chem Phys. 2022 May 25;24(20):12513-12527. doi: 10.1039/d2cp00427e.

Authors

Kazuaki Nakata^{1

2}, Takayoshi Kobayashi^{2

3

4

5}, Eiji Tokunaga²

Affiliations

¹ Department of Dentistry, Meikai University, 1-1 Keyakidai, Sakado, Saitama, 350-0283, Japan. washinkt@gmail.com.
² Department of Physics, Tokyo University of Science, Kagurazaka 1-3, Shinjuku-ku, Tokyo 162-8601, Japan.
³ Advanced Ultrafast Laser Research Center and Brain Science Inspired Life Support Research Center, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan.
⁴ JST, CREST, 5 Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan.
⁵ Department of Electrophysics, National Chiao-Tung University, 1001 Ta Hsinchu Rd., Hsinchu 300, Taiwan.

PMID: 35579019
DOI: 10.1039/d2cp00427e

Abstract

The molecules of tetra-phenyl porphyrin tetra-sulfonic acid (TPPS) form a J-aggregate via self-organization in aqueous solution. The J-aggregates formed in an aqueous solution with added hydrochloric acid were dispersed in PVP polymer and subjected to electric field modulation spectroscopy. The observed difference in the static polarizability Δα_p between the excited and ground states in the TPPS J-aggregates reached a value 2.66 × 10⁴ times and 1.22 × 10⁵ times larger than in the monomer molecules in PVA and PVP polymer matrices, respectively. This large enhancement factor of the electro-optic effect (EOE) may be induced by the higher-order structure of the J-aggregate. The different enhancement factor for each polymer matrix may be introduced by the structural differences between the polymer matrices. Electric field modulation spectroscopy of the J-aggregate in aqueous solution showed an absorbance change of 25% of the magnitude of absorbance peak.