Metal-Enhanced Fluorescence: Wavelength-Dependent Ultrafast Energy Transfer

Lee, Jaebeom; Lee, Sebok; Jen, Myungsam; Pang, Yoonsoo

doi:10.1021/acs.jpcc.5b08744

Cited by 27 publications

(31 citation statements)

References 63 publications

(108 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4-Dicyanomethylene-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM) is one of the "push-pull" emitters, where a strong ICT occurs between the electron donor (dimethylamino; DMA) and the electron acceptor (dicyanomethylene) connected by a π-bridge [10][11][12][13][14][15][16]. Due to the distinct photophysical aspects, DCM has been used in numerous applications including laser dyes [15,16], OLED emitters [17,18], molecular photo-switches [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Twisted Intramolecular Charge Transfer State of a “Push-Pull” Emitter

Lee

Jen

Pang

2020

IJMS

Self Cite

View full text Add to dashboard Cite

The excited state Raman spectra of 4-dicyanomethylene-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM) in the locally-excited (LE) and the intramolecular charge transfer (ICT) states have been separately measured by time-resolved stimulated Raman spectroscopy. In a polar dimethylsulfoxide solution, the ultrafast ICT of DCM with a time constant of 1.0 ps was observed in addition to the vibrational relaxation in the ICT state of 4–7 ps. On the other hand, the energy of the ICT state of DCM becomes higher than that of the LE state in a less polar chloroform solution, where the initially-photoexcited ICT state with the LE state shows the ultrafast internal conversion to the LE state with a time constant of 300 fs. The excited-state Raman spectra of the LE and ICT state of DCM showed several major vibrational modes of DCM in the LE and ICT conformer states coexisting in the excited state. Comparing to the time-dependent density functional theory simulations and the experimental results of similar push-pull type molecules, a twisted geometry of the dimethylamino group is suggested for the structure of DCM in the S1/ICT state.

show abstract

Section: Introductionmentioning

confidence: 99%

Twisted Intramolecular Charge Transfer State of a “Push-Pull” Emitter

Lee

Jen

Pang

2020

IJMS

Self Cite

View full text Add to dashboard Cite

show abstract

“…To measure the rate constant and efficiency of the energy transfer, femtosecond transient absorption measurements with 547 nm were performed 40, 41 . Figure 7(a)–(e) show transient absorption spectra of Zn( i + 2) - Zn( i + 6) in toluene, where the ground state bleaching bands at 515 and 550 nm and stimulated emission bands at 600, 650, and 720 nm (not shown) are mixed with much broader excited state absorption (ESA) bands.…”

Section: Resultsmentioning

confidence: 99%

Precisely tuneable energy transfer system using peptoid helix-based molecular scaffold

Kang

Yang

Lee

et al. 2017

Sci Rep

Self Cite

View full text Add to dashboard Cite

The energy flow during natural photosynthesis is controlled by maintaining the spatial arrangement of pigments, employing helices as scaffolds. In this study, we have developed porphyrin-peptoid (pigment-helix) conjugates (PPCs) that can modulate the donor-acceptor energy transfer efficiency with exceptional precision by controlling the relative distance and orientation of the two pigments. Five donor-acceptor molecular dyads were constructed using zinc porphyrin and free base porphyrin (Zn(i + 2)–Zn(i + 6)), and highly efficient energy transfer was demonstrated with estimated efficiencies ranging from 92% to 96% measured by static fluorescence emission in CH2Cl2 and from 96.3% to 97.6% using femtosecond transient absorption measurements in toluene, depending on the relative spatial arrangement of the donor-acceptor pairs. Our results suggest that the remarkable precision and tunability exhibited by nature can be achieved by mimicking the design principles of natural photosynthetic proteins.

show abstract

“…This depends on the distance between the metal nanoparticles and the particles of fluorophores. Enhancement of fluorescent signals due to the presence of metal nanoparticles, which is referred to as a metal-enhanced fluorescence, is commonly attributed to excitation of surface plasmons on the metal surfaces [4]. Then the nanoparticles act as fluorescence amplifiers.…”

Section: Introductionmentioning

confidence: 99%

Studies of concentration dependence of the fluorescent quantum yield from rhodamine 6G and Au�Pd core�shell nanorods, using a response surface methodology

Rammarat¹,

Locharoenrat²,

Yindeesuk³

et al. 2017

Ukr. J. Phys. Opt.

View full text Add to dashboard Cite

Abstract. We have applied a response surface approach to study the fluorescence quantum yield (FQY) of rhodamine 6G (Rh6G) mixed with Au-Pd core-shell nanorods (Au-Pd NRs). The FQYs have been measured for the Rh6G concentrations varying from 3.53×10 -7 to 1.70×10 -6 mol/L and the concentrations of Au-Pd NRs from 7.06×10 -6 to 1.36×10 -4 mol/L. Our experimental results testify that the FQY depends notably on the proportions of Rh6G and Au-Pd NRs. A specific relationship between the FQY and the concentrations has also been confirmed by a response surface plot. It is found that the discrepancy between the experiment and the calculations is less than 2%.

show abstract

Metal-Enhanced Fluorescence: Wavelength-Dependent Ultrafast Energy Transfer

Cited by 27 publications

References 63 publications

Twisted Intramolecular Charge Transfer State of a “Push-Pull” Emitter

Twisted Intramolecular Charge Transfer State of a “Push-Pull” Emitter

Precisely tuneable energy transfer system using peptoid helix-based molecular scaffold

Studies of concentration dependence of the fluorescent quantum yield from rhodamine 6G and Au�Pd core�shell nanorods, using a response surface methodology

Contact Info

Product

Resources

About