Premium
Efficient Two‐Photon Excited Fluorescence from Charge‐Transfer Cocrystals Based on Centrosymmetric Molecules
Author(s) -
Dai Chenghu,
Wei Zhixian,
Chen Zhen,
Liu Xiaoyan,
Fan Jihui,
Zhao Junfang,
Zhang Chuang,
Pang Zhiyong,
Han Shenghao
Publication year - 2019
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201900838
Subject(s) - photon upconversion , excited state , materials science , fluorescence , second harmonic generation , chromophore , molecule , intermolecular force , photochemistry , optoelectronics , photon , acceptor , charge (physics) , laser , excitation , chemical physics , molecular physics , luminescence , atomic physics , optics , chemistry , physics , condensed matter physics , quantum mechanics , organic chemistry
Two‐photon excited chromophores are widely applied for photon upconversion in organic optoelectronics. In this work, efficient two‐photon excited fluorescence is observed from charge‐transfer cocrystals where the molecular architectures of donor and acceptor molecules are both centrosymmetric. The superior structural symmetry of cocrystals eliminates the second harmonic generation of incident near‐infrared laser. The nonlinear optical properties of cocrystals are found to be strongly correlated with the intermolecular charge‐transfer interaction, bringing a wide window of excitation wavelength for the upconverted light emission. The work demonstrates that the cocrystallization of small molecules provides opportunities for the design and synthesis of novel organic optofunctional materials.