Highly efficient nonradiative energy transfer using charged CdSe/ZnS nanocrystals for light-harvesting in solution

Mutlugün, Evren; Nizamoğlu, Sedat; Demir, Hilmi Volkan

doi:10.1063/1.3182798

Cited by 31 publications

(24 citation statements)

References 19 publications

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“…R 0 is calculated using a well-known formula (see S8 in the Supporting Information) as 7.92 nm, which is comparatively larger than the typical value for FRET pairs without plasmonic metals5253. The reported Förster radius for the CdSe-S101 donor-acceptor FRET pair is 5.2 nm154.…”

Section: Discussionmentioning

confidence: 97%

Revolutionizing the FRET-Based Light Emission in Core-Shell Nanostructures via Comprehensive Activity of Surface Plasmons

Kochuveedu

Son

Lee

et al. 2014

Sci Rep

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We demonstrate the surface-plasmon-induced enhancement of Förster resonance energy transfer (FRET)using a model multilayer core-shell nanostructure consisting of an Au core and surrounding FRET pairs, i.e., CdSe quantum dot donors and S101 dye acceptors. The multilayer configuration was demonstrated to exhibit synergistic effects of surface plasmon energy transfer from the metal to the CdSe and plasmon-enhanced FRET from the quantum dots to the dye. With precise control over the distance between the components in the nanostructure, significant improvement in the emission of CdSe was achieved by combined resonance energy transfer and near-field enhancement by the metal, as well as subsequent improvement in the emission of dye induced by the enhanced emission of CdSe. Consequently, the Förster radius was increased to 7.92 nm and the FRET efficiency was improved to 86.57% in the tailored plasmonic FRET nanostructure compared to the conventional FRET system (22.46%) without plasmonic metals.

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Section: Discussionmentioning

confidence: 97%

Revolutionizing the FRET-Based Light Emission in Core-Shell Nanostructures via Comprehensive Activity of Surface Plasmons

Kochuveedu

Son

Lee

et al. 2014

Sci Rep

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“…Förster-type NRET is a dipole-dipole interaction between resonant donor and acceptor species and has a well-defined distance dependence [20]. NRET has been demonstrated in a large range of material systems, with potential for LED [9,[21][22][23][24][25] and light harvesting applications [2,3,13,[26][27][28][29][30][31][32][33]. QDs possess excellent optical properties such as broadband absorption with narrow and tunable emission profiles, giving them a distinct advantage over organic dyes [34,35].…”

Section: Introductionmentioning

confidence: 99%

Ag colloids and arrays for plasmonic non-radiative energy transfer from quantum dots to a quantum well

et al. 2017

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“…[30,[33][34]. By applying equation 3, a FRET efficiency of 39% was obtained for the singlet energy transfer from carbazole moiety to the QD core.…”

Section: Resultsmentioning

confidence: 99%

Blue light-emitting-diodes from poly (N-vinylcarbazole) doped with colloidal quantum dots encapsulated with carbazole terminated ligand: spectroscopic studies and devices

et al. 2012

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Blue emitting CdSe/ZnS quantum dots (QDs) were encapsulated with the ligand 11-(N-carbazolyl) undecanoic acid (C11). Steady-state photoluminescence (PL) experiments show an enhancement of the QD emission upon the excitation of the carbazole ligand in solution compared to the situation where a solution with the same concentration of QDs capped with oleic acid (OA) were excited at the same wavelength. This suggests energy transfer from the carbazole moiety to the QD cores. When incorporating the QDs in a poly (N-vinylcarbazole) (PVK) matrix, a significant enhancement of the QD emission upon the excitation of PVK was also observed indicating an efficient energy transfer from PVK to the QDs in the case of C11 capped ligands. Confocal microscopy images of the doped PVK films show clearly better miscibility of PVK and QDs capped with C11 compared with those capped with OA. Nanosecond time-resolved PL experiment shows evidence of singlet transfer with Förster resonance energy transfer (FRET) efficiency of 39% for the QDs in solution, while the efficiency of this process amounted to 15.6% for a PVK film doped with 30 wt% of the QDs. The smaller efficiency of the singlet transfer compared to the overall efficiency of energy transfer, suggested by the stationary PL spectra suggests an important role for triplet energy transfer. Electroluminescent devices were prepared with the structure; ITO/PEDOT:PSS/doped PVK with C11 capped QDs/Butyl PBD/Aluminum. Upon applying voltage, the devices show pure blue electroluminescence at low concentration of QDs (10 wt%) with a turn on voltage close to 6V.Keywords: Colloidal quantum dots, organic light emitting diodes, electroluminescence, blue OLEDs, energy transfer, triplet transfer, organic electronics, PVK INTRODUCTIONColloidal semiconductor quantum dots (QDs) are a relatively a new class of materials for optoelectronics. Due to their unique properties, e.g., tunable emission wavelength, they are attractive for many applications such as light emitting diodes, solar cells, and lasers [1-2]. Among them, cadmium selenide (CdSe) QDs have become a bench mark material for research on colloidal nanomaterials for (electro)luminesncence applications due to the tunability of their emission over the visible range between 475 and 670 nm upon increasing QD size [3]. To use QDs as a light source however requires also a the absence of (photo)chemical degradation and a high luminescence quantum yield (QY). These can be fulfilled by surface passivation with inorganic compounds which have broader band gap that encompasses the bandgap of the QD core, so-called core/shell nanostructure (type I) [2,[4][5].

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Highly efficient nonradiative energy transfer using charged CdSe/ZnS nanocrystals for light-harvesting in solution

Cited by 31 publications

References 19 publications

Revolutionizing the FRET-Based Light Emission in Core-Shell Nanostructures via Comprehensive Activity of Surface Plasmons

Revolutionizing the FRET-Based Light Emission in Core-Shell Nanostructures via Comprehensive Activity of Surface Plasmons

Ag colloids and arrays for plasmonic non-radiative energy transfer from quantum dots to a quantum well

Blue light-emitting-diodes from poly (N-vinylcarbazole) doped with colloidal quantum dots encapsulated with carbazole terminated ligand: spectroscopic studies and devices

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