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Emission Properties of Individual AIE-Luminogens in Solution at Room Temperature

Chinese Journal of Chemistry 2023年第23期41卷 3245-3252页

作者： Yuehua Zhao Hongbo Chen Shaojie Geng Shunjie Liu Dapeng Wang Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilin130022 China Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilin130022 China

Here,we combined the photon antibunching analysis,fluorescence correlation spectroscopy,and time-domain fluorescence lifetime imaging microscopy(TD-FLIM)to study the emission properties of a representative AIE-luminogen—4,4’-(benzo[c][1,2,5]thiadiazole-4,7-diyl)bis(N,N-diphenylaniline)(TPA-BT)at the single emitter level in a tetrahydrofuran(THF)/water solution where water is a non-solvent for *** findings suggest that,at a constant water fraction in the solution,the size of TPA-BT aggregates increases with the TPA-BT concentration;TPA-BT aggregates are not a quantum emitter at room temperature in the ***,utilizing TD-FLIM and a gel trapping technique allowed us to study the fluorescence lifetime of individual TPA-BT *** a polar solvent like water does not result in an overall decrease in fluorescence ***,it causes the fluorescence lifetime distribution to become wider,and only some molecules experience a decrease in their fluorescence *** results could represent a step forward in further understanding the photophysics of AIE-luminogens.

关键词： Aggregation-induced emission Fluorescence Fluorescence spectroscopy antibunching Time-domain fluorescence lifetime imaging microscopy

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Generation of Nonclassical Light by Unsaturated Two-Photon Absorption

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Optics and Photonics Journal 2017年第9期7卷 139-150页

作者： Goggi Madhavi Latha Meenakshisundaram Sripriya Narayanan Ramesh Department of Physics A. M. Jain College Meenambakkam India

In this paper, we investigate the distribution statistics of photons in a single mode radiation field subjected to two-photon absorption (TPA) and the factors that contribute to squeezing and antibunching of photons, leading to the generation of nonclassical light. TPA is a nonlinear optical phenomenon in which the atoms interact with the light field by absorbing two photons simultaneously. The motivation to study TPA is the recent intense activity on nanocrystallites/quantum dots. Further, it is the only nonlinear optical phenomenon that can be analytically studied. The simultaneous occurrence of squeezing and antibunching is studied with small initial photon numbers by solving the master equation for TPA of a single mode radiation directly by numerical integration, without going through analytical procedure. The results are compared with those of analytical/numerical procedures available. Further, the discussion on the parameters of squeezing and antibunching for short-time (ST) as well as long-time is done comprehensively in the present work by taking up the ST approximation and summation of ST (SST) procedure along with the exact numerical method.

关键词： Two-Photon Absorption Master Equation Squeezing antibunching Nonclassical Light

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NON-EQUIVALENCE OF THE TWO DEFINITIONS OF THE TWO-PHOTON COHERENT STATE

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Chinese Science Bulletin 1991年第20期36卷 1697-1701页

作者：周鹏彭金生 Department of Physics Hubei College of Education Wuhan 430060 PRC Department of Physics Huazhong Normal University Wuhan 430070 PRC

Ⅰ. INTRODUCTION The squeezed field state, which exhibits fluctuations in one quadrature component of field smaller than those associated with the vacuum state, at the cost of increased fluctuations in the other quadrature component, is one type of the pure quantum-mechanical states of the radiation field. The state has been extensively studied because of its potential applications in optical communications and weak signal detections since it was introduced by Stoler in 1970.

关键词： two-photon coherent state photon antibunching sub-Poisson distribution amplitude-squared squeezing of field.

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