Quenching of coumarin emission by CdSe and CdSe/ZnS quantum dots: Implications for fluorescence reporting

Baride, Aravind; Engebretson, Daniel; Berry, Mary T.; May, P. Stanley

doi:10.1016/j.jlumin.2013.03.027

Cited by 20 publications

(5 citation statements)

References 29 publications

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“…Their values are close to that determined from the absorption spectra. However, the observed K SV values are lower than that (3.48 Â 10 5 M À 1 ) observed for fluorescence quenching of 7-diethylaminocoumarin by CdSe QDs modified with a thiocinnamate ligand in DMF [29].…”

Section: Absorption Spectracontrasting

confidence: 60%

Photoinduced interaction of CdSe quantum dot with coumarins

El‐Kemary

Gaber

El-Sayed

et al. 2015

Journal of Luminescence

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Section: Absorption Spectracontrasting

confidence: 60%

Photoinduced interaction of CdSe quantum dot with coumarins

El‐Kemary

Gaber

El-Sayed

et al. 2015

Journal of Luminescence

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“…QDs have also started to be used in many fields with their multiple exciton production, easy and cheap production capacities, stability and high stability [12][13][14]. One of the main reasons for QDs to create hybrid associates with organic dyes is due to their long PL lifetime times and their ability to donor and adjust their absorbance and emission characteristics [15].…”

Section: Introductionmentioning

confidence: 99%

An Investigation The Spectroscopic Charactarization Of Alloy Cdsete Quantumdots/ Bromophenol Blue Hybrid Associates

Elibol

Demirci

2021

Sakarya University Journal of Science

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The use of hybrid associates in biological, optoelectronics and energy fields are increasing day by day. In this context, in this study, CdSeTe Quantum dots (QD): Bromophenol Blue (BPB) hybrid associates were studied for the first time in the literature and their spectroscopic characterizations were examined. In the study, CdSeTe QDs were synthesized with trioctylphosphine (TOP) ligands by hot injection method, and it was planned that the BPB would passivate the surface of the QD by interacting with the TOP ligand of the CdSeTe QDs. CdSeTe QD: BPB hybrid associates were prepared in different concentrations, and the effects of QD: BPB ratios on absorbance and emission characterizations were examined. Structures have been characterized using Uv-vis, PL, ICP-OES and FTIR. With the results found, the predictive mechanism has been put forward.

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“…Продемонстрирован также резонансный безызлучательный перенос энергии к Кр от возбужденного центра люминесценции, возникающей в результате донорно-акцепторной излучательной рекомбинации [8,[17][18][19][20][21][22][23][24][25][26][27][28][29]. Обратная ситуация, в которой донорами энергии являются молекулы органических Кр, а акцепторами -КТ, изучена недостаточно [18,30]. Установление условий, в рамках которых безызлучательный резонансный перенос энергии для синтезированных в рамках единого подхода гибридных ассоциатов изменяет направление, важно для понимания деталей механизмов этого процесса.…”

Section: Introductionunclassified

Резонансный безызлучательный перенос энергии в гибридных ассоциатах молекул тионина и коллоидных квантовых точек Ag-=SUB=-2-=/SUB=-S с различными механизмами люминесценции-=SUP=-*-=/SUP=-

Смирнов¹,

Овчинников²,

Перепелица³

2019

Журнал Технической Физики

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We have considered the resonant nonradiative energy transfer in hybrid associates of thionine dye (TH^+) molecules and Ag_2S colloidal quantum dots (QDs) passivated with thioglycolic acid (Ag_2S/TGA) and Ag_2S QDs stabilized with gelatin (Ag_2S/Gel). Used samples of Ag_2S QDs possess luminescence, which arises by the exciton mechanism, as well as by the recombination mechanisms of holes with electrons localized at luminescence centers and of electrons with holes localized at the luminescence centers. The quenching of luminescence of Ag_2S/TGA QDs (1.8 nm) with a maximum at 630 nm and a decrease in the luminescence lifetime from 13.7 to 6.5 ns, which occurs upon association with TH^+ molecules, have been established. On the contrary, for associates of Ag_2S/TGA QDs (5.5 nm) with TH^+ molecules, we have observed the quenching of luminescence of the dye and a decrease in the lifetime of this luminescence from 0.43 to 0.3 ns, as well as an enhancement of luminescence of QDs. In the case of hybrid association with TH^+ molecules, the luminescence enhancement of Ag_2S/Gel QDs (1.6 nm) has been established, which results from the recombination of free holes with electrons localized at luminescence centers. Based on our analysis of the luminescence kinetics of the dye, we have inferred the occurrence of resonant nonradiative energy transfer from TH^+ molecules to centers of recombination luminescence in Ag_2S/TGA (5.5 nm) and in Ag_2S/Gel (1.6 nm) QDs with its maxima at 950 and 1205 nm, respectively. For Ag_2S/TGA QDs (2.2 nm), which luminesce with a maximum at 620 nm by the exciton mechanism, we have observed a significant overlap both between the luminescence spectra of QDs and TH^+ and between their absorption spectra. Close parameters of the luminescence kinetics for both the initial components and their associates indicate the energy transfer, which is realized in opposite directions.

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Quenching of coumarin emission by CdSe and CdSe/ZnS quantum dots: Implications for fluorescence reporting

Cited by 20 publications

References 29 publications

Photoinduced interaction of CdSe quantum dot with coumarins

Photoinduced interaction of CdSe quantum dot with coumarins

An Investigation The Spectroscopic Charactarization Of Alloy Cdsete Quantumdots/ Bromophenol Blue Hybrid Associates

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