Tuning the Emission of CdSe Quantum Dots by Controlled Trap Enhancement

Baker, David R.; Kamat, Prashant V.

doi:10.1021/la100580g

Cited by 237 publications

(285 citation statements)

References 45 publications

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“…The latter has been typically explained in terms of surface atom vacancies or specifi c ligand-NQD inter actions. [29][30][31][32] The PL spectra of the complexes 1 and 2 are characterized by a broad PL band with a peak at 610-650 nm, which is due to radiative relaxation of the metalto-ligand charge transfer (MLCT) state. [ 33,34 ] The most notable effect of adding complex 2 to the solution of NQDs, observed in Figure 1 a and b, is a dramatic quenching of the NQD band-edge PL at 520 nm, which correlates with a signifi cant enhancement of PL in the spectral region of complex emission at λ > 600 nm.…”

Section: Doi: 101002/adfm201100415mentioning

confidence: 99%

Electronic Properties and Structure of Assemblies of CdSe Nanocrystal Quantum Dots and Ru‐Polypyridine Complexes Probed by Steady State and Time‐Resolved Photoluminescence

Koposov

Szymanski

Cardolaccia

et al. 2011

Adv Funct Materials

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Chemical and electronic interactions between CdSe nanocrystal quantum dots (NQDs) and Ru‐polypyridine complexes are studied in solution. It is shown that photoluminescence (PL) can be used to effectively monitor the formation of NQD‐complex assemblies in real time. It is also shown that with the aid of Langmuir isotherm modeling, the PL studies can be used to quantitatively characterize the composition of the assemblies and the strength of electronic interactions between their components. The approach demonstrated here is general and can be applied to other systems that combine semiconductor NQDs and appropriately functionalized organometallic or organic molecules interacting with NQDs via energy transfer, charge transfer, or other mechanisms leading to quenching of NQD emission.

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Section: Doi: 101002/adfm201100415mentioning

confidence: 99%

Electronic Properties and Structure of Assemblies of CdSe Nanocrystal Quantum Dots and Ru‐Polypyridine Complexes Probed by Steady State and Time‐Resolved Photoluminescence

Koposov

Szymanski

Cardolaccia

et al. 2011

Adv Funct Materials

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show abstract

“…Perhaps, this explains why fluorescence quenching studies of the QDs have received significant attention in recent years. [11,13,14,[16][17][18][19][20][21][22][23][24][25] Charge (electron or hole) and energy transfer are the two most commonly encountered exciton quenching mechanisms. While quenching due to energy transfer processes is governed by the spectral overlap of the donor emission and acceptor absorption and the donor-acceptor distance, charge-transfer-induced quenching is determined by the redox potentials of the donor and acceptor.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence Quenching of CdS Quantum Dots by 4‐Azetidinyl‐7‐Nitrobenz‐2‐Oxa‐1,3‐Diazole: A Mechanistic Study

Santhosh¹,

Patra²,

Soumya³

et al. 2011

ChemPhysChem

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Fluorescence quenching of CdS quantum dots (QDs) by 4-azetidinyl-7-nitrobenz-2-oxa-1,3-diazole (NBD), where the two quenching partners satisfy the spectral overlap criterion necessary for Förster resonance energy transfer (FRET), is studied by steady-state and time-resolved fluorescence techniques. The fluorescence quenching of the QDs is accompanied by an enhancement of the acceptor fluorescence and a reduction of the average fluorescence lifetime of the donor. Even though these observations are suggestive of a dynamic energy transfer process, it is shown that the quenching actually proceeds through a static interaction between the quenching partners and is probably mediated by charge-transfer interactions. The bimolecular quenching rate constant estimated from the Stern-Volmer plot of the fluorescence intensities, is found to be exceptionally high and unrealistic for the dynamic quenching process. Hence, a kinetic model is employed for the estimation of actual quencher/QD ratio dependent exciton quenching rate constants of the fluorescence quenching of CdS by NBD. The present results point to the need for a deeper analysis of the experimental quenching data to avoid erroneous conclusions.

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“…Up to now colloidal nanoparticles of cadmium sulphides, cadmium silicon and lead sulphides are used in organic light emitting diodes. These QDLEDs emit green light potentially [52][53][54][55][56]. On the other hand, these kinds of QDs have toxicological properties so it is environmentally restricted and not to be able to be a commercial material in this field.…”

Section: A Brief Review Of Quantum Dot-based Light Emitting Diodes (Qmentioning

confidence: 99%

Quantum Dot-Based Light Emitting Diodes (QDLEDs): New Progress

Heydari¹,

Ghorashi²,

Han³

et al. 2017

Quantum-Dot Based Light-Emitting Diodes

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In recent years, the display industry has progressed rapidly. One of the most important developments is the ability to build flexible, transparent and very thin displays by organic light emitting diode (OLED). Researchers working on this field try to improve this area more and more. It is shown that quantum dot (QD) can be helpful in this approach. In this chapter, writers try to consider all the studies performed in recent years about quantum dot-based light emitting diodes (QDLEDs) and conclude how this nanoparticle can improve performance of QDLEDs. In fact, the existence of quantum dots in QDLEDs can cause an excellent improvement in their efficiency and lifetime resulted from using improved active layer by colloidal nanocrystals. Finally, the recent progresses on the quantum dot-based light emitting diodes are reviewed in this chapter, and an important outlook into challenges ahead is prepared.

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Tuning the Emission of CdSe Quantum Dots by Controlled Trap Enhancement

Cited by 237 publications

References 45 publications

Electronic Properties and Structure of Assemblies of CdSe Nanocrystal Quantum Dots and Ru‐Polypyridine Complexes Probed by Steady State and Time‐Resolved Photoluminescence

Electronic Properties and Structure of Assemblies of CdSe Nanocrystal Quantum Dots and Ru‐Polypyridine Complexes Probed by Steady State and Time‐Resolved Photoluminescence

Fluorescence Quenching of CdS Quantum Dots by 4‐Azetidinyl‐7‐Nitrobenz‐2‐Oxa‐1,3‐Diazole: A Mechanistic Study

Quantum Dot-Based Light Emitting Diodes (QDLEDs): New Progress

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