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Colloidal Quantum Dots (colloidal + quantum_dot)
Selected AbstractsTemplate-Guided Self-Assembly of Colloidal Quantum Dots Using Plasma LithographyADVANCED MATERIALS, Issue 12 2009Michael Junkin A plasma lithography technique is developed to guide the self-assembly of colloidal quantum dots and other nanoscale building blocks, including fluorescent nanoparticles, gold nanoparticles, salts, and proteins. Plasma lithography enables the self-assembly of nanoscale materials onto soft and polymeric substrates with feature sizes as small as 100,nm. [source] Non-Blinking Semiconductor Colloidal Quantum Dots for Biology, Optoelectronics and Quantum OpticsCHEMPHYSCHEM, Issue 6 2009Piernicola Spinicelli Abstract Twinkle, twinkle: The blinking of semiconductor colloidal nanocrystals is the main inconvenience of these bright nanoemitters. There are various approaches for obtaining non-blinking nanocrystals, one of which is to grow a thick coat of CdS on the CdSe core (see picture). Applications of this method in the fields of optoelectronic devices, biologic labelling and quantum information processing are discussed. The blinking of semiconductor colloidal nanocrystals is the main inconvenience of these bright nanoemitters. For some years, research on this phenomenon has demonstrated the possibility to progress beyond this problem by suppressing this fluorescence intermittency in various ways. After a brief overview on the microscopic mechanism of blinking, we review the various approaches used to obtain non-blinking nanocrystals and discuss the commitment of this crucial improvement to applications in the fields of optoelectronic devices, biologic labelling and quantum information processing. [source] Inkjet-Printed Quantum Dot,Polymer Composites for Full-Color AC-Driven DisplaysADVANCED MATERIALS, Issue 21 2009Vanessa Wood Colloidal quantum dot,polymer composites are used for inkjet-print deposition of high-resolution, patterned, multicolored thin films in the fabrication of robust, bright, full-color AC-driven displays. The left panel shows a photograph of a complete device on a flexible substrate under UV illumination, while the right panel shows photographs of the electroluminescence of red, green, and blue 80 mm2 pixels. [source] Template-Guided Self-Assembly of Colloidal Quantum Dots Using Plasma LithographyADVANCED MATERIALS, Issue 12 2009Michael Junkin A plasma lithography technique is developed to guide the self-assembly of colloidal quantum dots and other nanoscale building blocks, including fluorescent nanoparticles, gold nanoparticles, salts, and proteins. Plasma lithography enables the self-assembly of nanoscale materials onto soft and polymeric substrates with feature sizes as small as 100,nm. [source] Hybrid Light-Emitting Diodes from Microcontact-Printing Double-Transfer of Colloidal Semiconductor CdSe/ZnS Quantum Dots onto Organic Layers,ADVANCED MATERIALS, Issue 10 2008Aurora Rizzo A novel dry deposition approach is developed to transfer arrays of colloidal quantum dots onto organic thin films, as illustrated in the figure. A red light-emitting device combining inorganic and organic components is fabricated based on this simple transfer protocol. [source] Nonradiative resonance energy transfer directed from colloidal CdSe/ZnS quantum dots to epitaxial InGaN/GaN quantum wells for solar cellsPHYSICA STATUS SOLIDI - RAPID RESEARCH LETTERS, Issue 7 2010Sedat Nizamoglu Abstract We report on Förster-type nonradiative resonance energy transfer (NRET) directed from colloidal quantum dots (QDs) to epitaxial quantum wells (QWs) with an efficiency of 69.6% at a rate of 1.527 ns,1 for potential application in III-nitride based photovoltaics. This hybrid exciton generation,collection system consists of chemically-synthesized cyan CdSe/ZnS core/shell QDs (,PL = 490 nm) intimately integrated on epitaxially-grown green InGaN/GaN QWs (,PL = 512 nm). To demonstrate directional NRET from donor QDs to acceptor QWs, we simultaneously show the decreased photoluminescence decay lifetime of dots and increased lifetime of wells in the hybrid dipole,dipole coupled system. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Photoluminescence properties of PbSe/PbS core-shell quantum dotsPHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 12 2009Georgy I. Maikov Abstract The present study describes the investigation of the ground-state exciton emission in the PbSe/PbS core-shell colloidal quantum dots (CQDs) with different core-radius/shell-thickness ratio, by recording temperature dependence of ground-state exciton photoluminescence (PL) properties, including line-width, integrated PL intensity, and the temperature coefficient of energy band-gap, over a temperature range from 1.4 K to 300 K. The obtained data reveal a reduction of the temperature coefficient of the energy band-gap as well as slightly decrease of exciton and optical phonon coupling in the PbSe/PbS core-shell CQDs with respect to that in the corresponding PbSe core. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Suppressed blinking in CdTe/CdSe core-shell quantum dotsPHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 12 2009Viki Kloper Abstract CdTe/CdSe core-shell colloidal quantum dots (CQDs) were synthesized by a unique colloidal procedure permitting the growth of spherical structures with the highest emission quantum efficiency (,90%). The CQDs photoluminescence (PL) intensity shows only minor fluctuations (<10%) in time, revealing a blinking suppression in the CQDs, while the PL of a single CQD shows the occurrence of longer lived (ns) multiexcitons, important for the applications of CQDs also in gain devices. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] | ||||||||||