Femtosecond time-resolved measurement of LDS698 molecular processes under high pressure

Liu, Bingguo; Mu, Jin; Hang, Liu; He, Chunyuan; Jiang, Dianwu; Ding, Dajun

doi:10.1063/1.2948903

Cited by 7 publications

(7 citation statements)

References 28 publications

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“…Since molecular solids are easy to be compressed, pressure can modulate either the bonds between the atoms in a molecule or the distance between molecules and thus either change energy level or affect molecules' interactions. It has been reported that pressure plays a significant role in changing the molecular structure, shaping the potential energy surfaces or shifting the molecular energy levels, etc [99][100][101]. Dynamics is an intrinsic data for physical and chemical properties of molecules, which directly reflects the adjustment of molecular energy level and the delocalization of wave function.…”

Section: Moleculesmentioning

confidence: 99%

Ultrafast dynamics under high-pressure

Pan

et al. 2023

J. Phys.: Condens. Matter

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High-pressure is a mechanical method to regulate the structure and internal interaction of materials. Therefore, observation of properties’ change can be realized in a relatively pure environment. Furthermore, high-pressure affects the delocalization of wavefunction among materials’ atoms and thus their dynamics process. Dynamics results are essential data for understanding the physical and chemical characteristics, which is valuable for materials application and development. Ultrafast spectroscopy is a powerful tool to investigate dynamics process and becoming a necessary characterization method for materials investigation. The combination of high-pressure with ultrafast spectroscopy in the nanocosecond~femtosecond scale enables us to investigate the influence of the enhanced interaction between particles on the physical and chemical properties of materials, such as energy transfer, charge transfer, Auger recombination, etc. Base on this point of view, this review summarizes recent progress in the ultrafast dynamics under high-pressure for various materials, in which new phenomena and new mechanisms are observed.In this review, we describe in detail the principles of in situ high pressure ultrafast dynamics probing technology and its field of application. On this basis, the progress of the study of dynamic processes under high-pressure in different material systems is summarized. An outlook on in situ high-pressure ultrafast dynamics research is also provided.

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Section: Moleculesmentioning

confidence: 99%

Ultrafast dynamics under high-pressure

Pan

et al. 2023

J. Phys.: Condens. Matter

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“…So far, owing to the limitation of experimental techniques, most of the excited state dynamic properties under high-pressure are investigated in solutions, such as LDS698 solution, coumarin solution, etc. [17][18][19][20][21][22] However, the solvent of solutions can be solidified at a relatively low pressure, which is an anisotropic pressure. And coordination compounds also appear in the pressurization process, which may affect the dynamic process.…”

Section: Introductionmentioning

confidence: 99%

Steady and transient behavior of perylene under high pressure*

Wang¹,

Tu²,

Han³

et al. 2021

Chinese Phys. B

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Pressure can reduce the distances among atoms, thereby modifying the overall optical characteristics of molecules. In this article, the excited state behavior of perylene is carefully observed under isotropic pressure and non-complexing condition. In a steady state, absorption peak shows red shift and spectral width are broadened with pressure increasing, which is ascribed to the π-electron delocalization between molecules. In a transient state, the transition dynamics presents a wavelike tendency with pressure increasing because the shift of self-tapping exciton state is contrary to that of Y-state with pressure increasing. The results conduce to understanding the influence of inter-molecule interaction on excited state behavior with inter-molecule distance decreasing, which contributes to studying the materials under extreme condition.

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“…The combination of high-pressure technology and ultrafast spectroscopy methods is expected to open a window to observe and investigate the interaction-dependent transient physical process. Recently, several studies were reported that used high-pressure femtosecond transient absorption spectroscopy (HP fs-TAS). − A pressure-induced redshift in the photoluminescence spectra of the conjugated polymer F8BT (9,9-di- n -octylfluorene- alt -benzothiadiazole) film caused by interchain π–electron interaction was found by Schmidtke et al at high pressure . In another HP fs-TAS work on copolymer poly(9,9-dioctylfluorene- co -benzothiadiazole), Albert-Seifried et al found that more delocalized excited states appeared at high pressures .…”

Section: Introductionmentioning

confidence: 99%

“…In another HP fs-TAS work on copolymer poly(9,9-dioctylfluorene- co -benzothiadiazole), Albert-Seifried et al found that more delocalized excited states appeared at high pressures . Besides, Liu et al reported that the rate of intermolecular energy relaxation could be changed in solidified LDS698 (pyridine, C 19 H 23 N 2 O 4 Cl) molecular solution significantly . Despite much progress being made, the information about the relaxation dynamics of excitons in PDPP-F film aggregation under pressure, which is of great interest and fundamental for the design and optimization of optoelectronic devices based on PDPP-F material, is still unknown.…”

Section: Introductionmentioning

confidence: 99%

Pressure-Dependent Relaxation Dynamics of Excitons in Conjugated Polymer Film

Wang

et al. 2015

J. Phys. Chem. C

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Conjugated polymers have been widely used in polymer solar cells (PSC). The transient absorption spectra on conjugated polymer poly{2,7′-9,9-dioctylfluorene-alt-5-diethylhexyl-3,6-bis(5-bromothiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4-dione} (PDPP-F) film are measured under pressure, and the pressure-dependent relaxation dynamics of excitons in PDPP-F film are investigated. It is found that the relaxation dynamics of excitons under high pressure could be divided into a fast relaxation process that is attributed to the exciton− exciton annihilation (EEA) and a slow relaxation process that is assigned to the diffusion of free excitons. As a result of pressure-induced delocalization of excitons and extension of lifetime of free excitons, both the EEA process and the free exciton diffusion are enhanced upon compression. Moreover, the delocalization extent of excitons under different pressures is quantitatively calculated, indicating that the scale of exciton delocalization at 30 GPa is tripled compared with that at 1 atm. These results are very important to understand the photophysical property of polymer and to optimize the efficiency of PSC.

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Femtosecond time-resolved measurement of LDS698 molecular processes under high pressure

Cited by 7 publications

References 28 publications

Ultrafast dynamics under high-pressure

Ultrafast dynamics under high-pressure

Steady and transient behavior of perylene under high pressure*

Pressure-Dependent Relaxation Dynamics of Excitons in Conjugated Polymer Film

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