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Core/shell CdSe/ZnS quantum dots (QDs) with the emission wavelength of 618nm, was synthesized by thermal deposition using cadmium oxide and selenium as precursors in a hot lauric acid and hexadecylamine trioctylphosphine oxide hybrid. To compensate a poor color rendering index of YAG:Ce based white light-emitting diodes due to the lack of red spectral component, CdSe/ZnS QDs were blended into YAG:Ce...
A novel colloidal quantum dot-polyimide nanocomposite system aimed for integration with GaN-optoelectronics for color-conversion and visible light communications is reported. The nanocomposites' static and dynamic optical properties, including modulation responses, are assessed.
White light emitting diodes (LEDs) were fabricated combining InGaN LED chip as the excitation source and CdSe/ZnSe as the phosphor. CdSe/ZnSe nanoparticles were synthesized via wet chemical method using CdO, zinc stearate, TOP Se as precursors. 4.5 and 5.3 nm diameter CdSe/ZnSe nanoparticles with emission peak at 540 and 620nm, respectively, were obtained. CdSe nanoparticle phosphors were coated onto...
In this work we fabricated white LEDs using a blue InGaN LED precoated conjugated copolymer/QDs composite (green-emitting Poly [(9,9-dioctyl-2,7-divinylenefluorenylene)-alto-co-(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene)]/red-emitting CdSe quantum dots) as hybrid phosphor. The emission peak wavelengths of blue, green and red emissions in spectra are 462 and 618 nm respectively. Green-emitting polymer...
This paper reports the synthesis and characterization of CdTe system in the ternary surfactant mixture. The quantum dots was prepared by quick injection of tri-n-octylphosphine telluride (TOPTe) into reactor that contains a hot mixed cadmium acetate hydrate, 1-octadecene, n-octadecyl phosphoric acid (ODPA), octadecylamine (ODA) and oleic acid (OA). We found that the surfactant of ODPA, OA and ODA...
Core/shell CdS/ZnS quantum dots (QDs) with the emission wavelength of 618nm, was synthesized by thermal deposition using cadmium oxide and selenium as precursors in a hot lauric acid and hexadecylamine trioctylphosphine oxide hybrid. CaAl2Si2O8:Eu2+, Mn2+ phosphor was synthesized by high-temperature solid state reaction at 1290°C for 2 hours under the H2 reducing atmosphere, and X-ray powder diffraction...
Recently, researches on nanocrystal quantum dot-based LEDs (NQD-based LEDs) have dramatically increased due to their characteristics resulting in pure and saturated colors with a narrow bandwidth. More importantly, colors can be easily tuned by varying the size or the composition of NQDs, and high quantum yields (QY) of NQDs can increase the efficiency greatly. In spite of high fluorescence QY of...
We have fabricated and investigated the effect of CdSe/ZnS quantum dot (QD) concentrations on self-assembly hybrid organic/inorganic light emitting diodes (QD-OLEDs). The uniform distribution of QDs with controllable density was achieved using the conventional spin-coating method. There was a QD threshold concentration below which there was no emission from the QDs. The estimated QD concentration...
Pink light emission has been demonstrated from the hybrid CdSe/ZnS quantum dot-InGaN/GaN quantum well light-emitting diodes (LEDs). The QDs in toluene are blended in the resin matrix to become the nanophosphor. For the fabricated hybrid LED, it is found the light output power is greatly reduced due to the poor quantum yield (QY) of QDs (<50%). Besides, the comparison of the electroluminescence...
In this study, tuneable white light generation by controlling CdSe/ZnS/CdSe core/shell/shell heteronanocrystals integrated on InGaN/GaN light emitting diodes was presented. These multilayered quantum dots, also known as onion-like heterostructures, were designed and synthesized to emit in red (around 600 nm) from the CdSe core and in green (around 550 nm) from the CdSe shell. By designing and hybridizing...
In this paper, the preparation of nanocomposites based on the incorporation of pre-synthesized (CdSe)ZnS core-shell luminescent nanocrystals (NCs) both in a PMMA (poly-methyl methacrylate) homo-polymer and into properly functionalized PMMA co-polymers is discussed. By using this novel luminescent nanocomposite materials, 2D photonic crystals are fabricated by Nanoimprint Lithography (NIL) and characterized,...
The study aims to fabricate and demonstrate hybrid white light emitting diodes that integrate white emitting CdS nanoluminophores with high light quality. Results show that the white light properties of these hybrid WLED (including (x,y) chromaticity coordinates, color temperature, and color rendering index (Ra)) are conveniently tuned as desired across the white region by controlling the number of...
Phosphor-free all-semiconductor white-light devices are fabricated by coating CdSe/ZnS nano-crystals on blue/green two-wavelength LEDs for converting blue photons into red light. The LEDs are implemented by stacking two different types of InGan/GaN quantum wells.
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