Sensitization of photoprocesses in colloidal Ag 2 S quantum dots by dye molecules

Ovchinnikov, O. V.; Kondratenko, T. S.; Grevtseva, I. G.; Pokutnyi, Sergey I.

doi:10.1117/1.jnp.10.033505

Cited by 31 publications

(13 citation statements)

References 58 publications

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“…Наиболее подробно рассмотрены ситуации, в которых донорами энергии в гибридных ассоциатах выступают КТ, обладающие экситонной люминесценцией, а молекулы Кр -акцепторами энергии возбуждения [1][2][3][4][5][6][7][8][9][10][12][13][14][15][16]. 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].…”

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.

show abstract

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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show abstract

“…Подобного рода гибридные наноструктуры проявляют особые свойства, обусловленные наличием локальных уровней структурно-примесных дефектов, а также их участием в резонансном переносе электронных возбуж-дений [16][17][18][19][20][21]. В большей степени проанализированы процессы, в которых донором электронного возбужде-ния выступают возбужденные уровни центров рекомби-национной люминесценции.…”

Section: Introductionunclassified

Люминесцентные и нелинейно-оптические свойства гибридных ассоциатов квантовых точек Ag-=SUB=-2-=/SUB=-S с молекулами тиазиновых красителей-=SUP=-*-=/SUP=-

Kondratenko¹,

Grevtseva²,

Звягин³

et al. 2018

Журнал Технической Физики

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“…The photosensitization of luminescence excitation of colloidal Ag 2 S QDs was interpreted by resonance nonradiation transfer of electronic excitation energy from cis-J-aggregates of Dye1 and cations of Dye2 to centers of recombination luminescence of Ag 2 S QDs. 2 The hybrid association of colloidal Ag 2 S QDs with molecules of Dye1 and Dye2 provides the formation of heterostructures of the first type. Under conclusions of this location of energy states of the hybrid associates component, the exchange of electronic excitation between molecules of Dye1 and Dye2 and Ag 2 S QDs is possible under excitation of dye molecules due to non-radiative resonance energy transfer of electronic excitation.…”

mentioning

confidence: 99%

“…Founding the possibility of association of Ag 2 S QDs with cations of Dye2 shows the possibility of simultaneous sensitization of singlet oxygen near the hybrid associate. 2 The paper (see Ref.…”

mentioning

confidence: 99%