Multipolar dyes for NLO: solvation and aggregation effects

Francesca Terenziani; Cristina Sissa; Anna Painelli

doi:10.1117/12.783303

25 April 2008 Multipolar dyes for NLO: solvation and aggregation effects

Francesca Terenziani, Cristina Sissa, Anna Painelli

Proceedings Volume 6999, Organic Optoelectronics and Photonics III; 69990J (2008) https://doi.org/10.1117/12.783303
Event: SPIE Photonics Europe, 2008, Strasbourg, France

Abstract

Charge resonance is a characteristic feature of organic molecules where electron donor (D) and acceptor (A) groups are linked by π-conjugated bridges. Dipolar (D-π-A), quadrupolar (D-π-A-π-D or A-π-D-π-A) or, more generally, multipolar molecules are widely studied for applications in nonlinear optics. We propose a general model for multipolar chromophores based on an essential-state description of the electronic structure, and accounting for the coupling of electrons and molecular vibrations and polar solvation coordinates. Depending on the charge distribution on the molecule, multistable potential energy surfaces are found for the ground state and/or the lowest-energy excited state. The resulting symmetry breaking shows up with important solvatochromic effects in either absorption or fluorescence spectra. The essential-state model lends itself quite naturally to describe supramolecular interactions in aggregates, crystals, or ordered films. At variance with the standard excitonic pictures, we relax the dipole approximation for electrostatic intermolecular interactions and demonstrate important excitonic shifts of dark (two-photon allowed) states for quadrupolar dyes. Moreover, bound-biexciton states are found with huge two-photon absorption.

Citation Download Citation

Francesca Terenziani, Cristina Sissa, and Anna Painelli "Multipolar dyes for NLO: solvation and aggregation effects", Proc. SPIE 6999, Organic Optoelectronics and Photonics III, 69990J (25 April 2008); https://doi.org/10.1117/12.783303

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available