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Enhanced Three-Photon Absorption by Symmetric Twisted Intramolecular Charge Transfer

Chinese Physics Letters 2005年第6期22卷 1394-1397页

作者：郭福全杨军张其锦明海 StructureResearchLaboratory UniversityofScienceandTechnologyofChinaHefei230026 DepartmentofPhysics UniversityofScienceandTechnologyofChinaHefei230026 DepartmentofPolymerScienceandEngineering UniversityofScienceandTechnologyofChinaHefei230026

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.

关键词： COMPOUND 2-PHOTON FLUORESCENCE EXCITATION STORAGE charge transfer CENTROSYMMETRIC Photon absorption Storage picosecond pulsed laser device absorption compounds Excitation pulsed lasers Fluorescence

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Formation and Decay of Electron-Hole Plasma Clusters in a Direct-Gap Semiconductor CuCl

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Chinese Physics Letters 2003年第10期20卷 1833-1835页

作者：姜磊吴明卫 M.Nagai M.Kuwata-Gonokami StructureResearchLaboratory UniversityofScienceandTechnologyofChinaHefei230026 DepartmentofPhysics UniversityofScienceandTeclmologyofChinaHefe230026 DepartmentofPhysics KyotoUniversityKyoto606-8502Japan DepartmentofAppliedPhysics UniversityofTokyoHongoBunkyo-kuTokyo113-8656Japan

The master equation for the cluster-size distribution function is solved numerically to investigate the electron-hole droplet formation claimed to be discovered in the direct-gap CuCl excited by picosecond laser pulses [Nagai et al. Phys. Rev. Lett. 86 (2001) 5795; J. Lumin. 100 (2002) 233]. Our result shows that for the excitation in the experiment, the average number of pairs per cluster (ANPC) is only around 5.2, much smaller than that (10~6 typically for Ge) of the well studied electron-hole droplet in indirect-gap semiconductors such as Ge and Si. These results indicate that what measured in CuCl by Nagai et al. may not come from the EHD formed from exciton gas, instead possibly come from some bubbles of excitons in metallic liquid.

关键词： Exciton Electrohydrodynamics bubbles Semiconductor materials decay lumin Excitation Clusters Distribution function aluminium Decay Electron-hole plasma Master equation picosecond pulsed laser device digitally

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