Enhanced Three-Photon Absorption by Symmetric Twisted Intramolecular Charge Transfer
强化三光子吸收对称扭曲的分子内电荷转移作者机构：StructureResearchLaboratoryUniversityofScienceandTechnologyofChinaHefei230026 DepartmentofPhysicsUniversityofScienceandTechnologyofChinaHefei230026 DepartmentofPolymerScienceandEngineeringUniversityofScienceandTechnologyofChinaHefei230026
出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)
年 卷 期：2005年第22卷第6期
页 面：1394-1397页
核心收录：
学科分类：07[理学] 070203[理学-原子与分子物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0702[理学-物理学]
基 金：国家自然科学基金
主 题：COMPOUND 2-PHOTON FLUORESCENCE EXCITATION STORAGE charge transfer CENTROSYMMETRIC Photon absorption Storage Picosecond pulsed laser device absorption compounds Excitation Pulsed lasers Fluorescence
摘 要：We report on a novel organic chromophore with symmetric twisted intramolecular charge transfer (TICT) state on excitation. The properties of nonlinear transmission induced by three-photon absorption (3PA) are demonstrated pumped with nanosecond laser pulse. Large 3PA cross sections as high as the order of 10-74cm6s2 have been obtained for nanosecond and picosecond laser pulses at 1064nm from intensity-dependent transmission measurements. Similar two emissive behaviours from one-photon and three-photon excited fluorescence spectra indicate that the linear and nonlinear fluorescences share the same TICT relaxation process from the excited states. The intensity dependence of upconversion fluorescence on the incident intensity obeys the cubic law that characterizes the three-photon absorption.
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