Photoluminescence and Energy Transfer Study of Eu3+ Codoped with CdS Nanoparticles in Silica Glass

Bokatial, L.; Rai, S.B.

doi:10.1007/s10895-011-0984-2

Cited by 14 publications

(11 citation statements)

References 24 publications

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“…Surface states have been proposed to play an important role in the upconversion in nanoparticles such as CdS and CdSe 175. For semiconductor QDs with three‐dimensional (3D) quantum confinement, upconversion has recently been reported for CdS,176 InP,177 CdSe,175 InAs/GaAs,178 InGaN/GaN multiple quantum wells,179 ZnSe,180 CdSeS,172 Er‐doped CdS181 and lanthanide‐doped NaYF 4 182…”

Section: Optical Propertiesmentioning

confidence: 99%

Exciton Dynamics in Semiconductor Nanocrystals

2013

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This review article provides an overview of recent advances in the study and understanding of dynamics of excitons in semiconductor nanocrystals (NCs) or quantum dots (QDs). Emphasis is placed on the relationship between exciton dynamics and optical properties, both linear and nonlinear. We also focus on the unique aspects of exciton dynamics in semiconductor NCs as compared to those in bulk crystals. Various experimental techniques for probing exciton dynamics, particularly time-resolved laser methods, are reviewed. Relevant models and computational studies are also briefly presented. By comparing different materials systems, a unifying picture is proposed to account for the major dynamic features of excitons in semiconductor QDs. While the specific dynamic processes involved are material-dependent, key processes can be identified for all the materials that include electronic dephasing, intraband relaxation, trapping, and interband recombination of free and trapped charge carriers (electron and hole). Exciton dynamics play a critical role in the fundamental properties and functionalities of nanomaterials of interest for a variety of applications including optical detectors, solar energy conversion, lasers, and sensors. A better understanding of exciton dynamics in nanomaterials is thus important both fundamentally and technologically.

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Section: Optical Propertiesmentioning

confidence: 99%

Exciton Dynamics in Semiconductor Nanocrystals

2013

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“…При увеличении концентрации ионов Eu 3+ c 1.0 · 10 −4 до 1.0 · 10 −3 mol/L (изменении мольных соотношений Zn : Cu : Eu c 1 : 0.1 : 0.01 до 1 : 0.1 : 0.1) максимум широкой полосы в спектре люминесценции (< 500 nm) композиций смещается в коротковолновую часть спектра (рис. [21,23].…”

Section: экспериментальная частьunclassified

“…В качестве сульфирующих агентов при синтезе КТ используются сероводород, сульфид натрия, сераорганические соединения [2,38.42]. КТ выделяют из растворов, наносят на различные подложки [21,24]. Размер КТ, как правило, не превышает 10 nm [19,20,22,39,41,42].…”

Section: Introductionunclassified

“…В процессе синтеза ионы Ln 3+ оказываются включенными в кристаллическую структуру полупроводника или находятся на поверхности частиц [19,23,25,41,42]. Возбуждение люминесценции и люминесценция КТ, легированных лантаноидами, связаны с межзонным переходам электронов и примесными уровнями в запрещенной зоне полупроводника, а также с электронными переходами в ионах Ln 3+ [19][20][21][22][23][24][25]41,42]. При исследовании структур ZnS/Eu 3+ и CdS/Eu 3+ обнаружен перенос энергии с полупроводниковой матрицы к ионам Eu 3+ , приводящий к увеличению интенсивности люминесценции ионов Ln 3+ .…”

Section: Introductionunclassified

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Фотолюминесценция квантовых точек Zn-=SUB=-1-x-y-=/SUB=-Cu-=SUB=-x-=/SUB=-Eu-=SUB=-y-=/SUB=-S/EuL-=SUB=-3-=/SUB=- в полиакрилатной матрице

Smagin¹,

Исаева²,

Eremina³

2020

Журнал Технической Физики

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Zinc sulfide is one of the most popular luminescent semiconductors of group A(II)B(VI). Doping ZnS quantum dots with Ln3+ ions makes it possible to form nanoscale structures in a semiconductor matrix containing isolated centers of narrow-band luminescence. The introduction of quantum dots into the acrylate matrix further stabilizes the particles and allows them to form their morphology. Nanoscale structures of Zn1-x-yCuxEuyS/EuL3, where L − trifluoroacetate are anions, were synthesized by the method of emerging reagents in situ in the medium of methyl methacrylate (MMA). ZnS doping was performed by simultaneous introduction of soluble precursors of zinc sulfide, as well as copper and europium trifluoroacetates into the acrylate reaction mixture. Polymer optically transparent compositions of PMMA/Zn1-x-yCuxEuyS/EuL3 were obtained by radical polymerization of MMA in the block. The excitation of luminescence of compositions is associated with Interzone electron transitions in ZnS, with a system of levels that form alloying ions in the forbidden zone of ZnS, as well as with their own energy absorption by Eu3+ ions. Broadband luminescence of compositions is caused by intracrystalline defects formed in ZnS during doping. Narrow-band luminescence occurs as a result OF 5D0→7Fj electronic transitions in Eu3+ ions associated with quantum dots, as well as being in the polymer matrix independently of them. The transfer of energy from the donor levels of the semiconductor matrix to the levels of Eu3+ ions, followed by its release in the form of luminescence, was confirmed by the imposition of absorption bands doped with ZnS and excitation bands of luminescence compositions, as well as an increase in the intensity of narrow-band luminescence of Eu3+ ions while reducing the intensity of a wide band of recombination luminescence of doped ZnS. A decrease in the intensity of the ZnS recombination luminescence band with an increase in the concentration of Eu3+ >1.0∙10-3 mol/L ions is also associated with the formation of a layer of complex europium compounds on the particle surface that prevent the passage of exciting radiation to the particle core.

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“…В качестве сульфидизатора используются H 2 S, Na 2 S, сераорганические соединения [4,37,38,41,43,44,46]. КТ выделяют из растворов в виде порошка, наносят на различные подложки [34,47]. Размер КТ, как правило, не превышает 10 nm [30,38,43,46,48].…”

Section: Introductionunclassified

Фотолюминесценция композиций полиметилметакрилат/(Zn, Cu, Ag)S : Eu-=SUP=-3+-=/SUP=-

Smagin¹,

Затонская²,

Ilina³

et al. 2020

Физика Твердого Тела

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Luminescent nanoscale particles (quantum dots) (Zn,Cu,Ag)S:Eu3+ were synthesized during decomposition of thioacetamide complexes of metals in a methylmethacrylate medium during block polymerization under heating. The formation of quantum dots is confirmed by the corresponding band in the optical absorption spectrum of polymer compositions. Photoluminescence of PMMA/(Zn,Cu,Ag)S:Eu3+ compositions is manifested as a complex band associated with defects in the crystal structure formed when ZnS was doped with copper and silver ions, and a set of narrow bands of luminescence of Eu3+ ions. Luminescence excitation occurs as a result of inter-zone transitions and electron transitions from the valence band to the ZnS defect levels, and self-absorption of energy by Eu3+ ions. The relationship of ions Eu3+ particles of ZnS is confirmed by the dependence of the intensity of the broadband luminescence of ZnS with increasing concentration of ions Eu3+ and an increase in intensity narrow-band luminescence of ions Eu3+ as a result of energy transfer from levels of doped ZnS crystals on the energy levels of the ions Eu3+.

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Photoluminescence and Energy Transfer Study of Eu3+ Codoped with CdS Nanoparticles in Silica Glass

Cited by 14 publications

References 24 publications

Exciton Dynamics in Semiconductor Nanocrystals

Exciton Dynamics in Semiconductor Nanocrystals

Фотолюминесценция квантовых точек Zn-=SUB=-1-x-y-=/SUB=-Cu-=SUB=-x-=/SUB=-Eu-=SUB=-y-=/SUB=-S/EuL-=SUB=-3-=/SUB=- в полиакрилатной матрице

Фотолюминесценция композиций полиметилметакрилат/(Zn, Cu, Ag)S : Eu-=SUP=-3+-=/SUP=-

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