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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 91 for “"Light emitting devices"”.
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GeSn Light-Emitting Devices
<p>Silicon based optoelectronic devices have been investigated for decades. However, due to the indirect band gap nature of Si and Ge, developing of efficient light-emitting source on Si is still a challenging topic. GeSn based optoelectronic devices have the great potential to overcome this …
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Commercialization potential of quantum dot light emitting devices
… as discrete emitters in hybrid organic/inorganic light emitting devices is an attractive approach for producing novel display products. These structures exhibit narrow-band emission tunable across the visible spectrum - characteristics allowing for display devices not possible with current OLEO …
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Investigation of charge-transport models for organic light-emitting devices
Organic light emitting devices (OLEDs) show promise for use in the display industry, particularly as the active display portion of flat panel televisions and monitors. Unfortunately important material fundamentals of these organics are not well understood, like charge transport, charge injection …
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Colloidal quantum dot based light emitting devices on silicon substrate
Light sources based on silicon have been the subject of interest for many years. Silicon would not only provide high volume manufacturing for commercialization but also allow complementary metal oxide semiconductor (CMOS) compatibility enabling integration of light sources within CMOS circuitry. …
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Improving the external extraction efficiency of organic light emitting devices
Over the last decade Organic Light Emitting Device (OLED) technology has matured, progressing to the point where state-of-the-art OLEDs can demonstrate external extraction efficiencies that surpass those of fluorescent lights. Additionally, OLEDs have the benefits over conventional display and …
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Highly Luminescent Platinum Complexes for Light Emitting Devices and Bio-Imaging
… in the fabrication of high efficiency organic light emitting devices (OLED)s. The colour of a device depends on the monomer-to-excimer emission ratio, which is controlled by varying the dopant concentration. At intermediate concentrations, white OLEDs, with properties approaching pure white …
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Enhancing quantum-dot luminescence in visible and infrared light emitting devices
… efficiency (EQE) of colloidal quantum-dot light emitting devices (QD-LEDs) can be enhanced by addressing in situ QD photoluminescence (PL) quenching mechanisms occurring with and without applied bias. QD-LEDs promise efficient, high colour-quality solid-state lighting and displays, and our …
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MOCVD growth of In GaP-based heterostructures for light emitting devices
… implementation of strained-InGaP quantum-well light emitting diodes (LEDs) operating in the yellow-green region of the visible spectrum. The innovative use of these traditional materials is intended to provide a solution for bright green solid-state light emitters. Initial modes of InGaP …
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Measurement and control of exciton spin in organic light emitting devices
… material set for electronic and optoelectronic devices. Their properties can be precisely controlled through chemistry, and they are well-suited for large-area, flexible, and low-cost devices. Optical emission and absorption in these materials is mediated by strongly-bound electron-hole pairs …
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Synthesis and charaterisation of phosphorescent copper (I) complexes for light emitting devices
… active materials in a new generation of organic light emitting devices (OLEDs). Current OLED technology is focused on organo-transition metal complexes, which emit from the triplet excited state and exhibit bright phosphorescence. Efficient in devices have been reported using these luminescent …
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Fabrication and optimization of light emitting devices with core-shell quantum dots
Quantum dot light emitting devices (QD-LEDs) are promising options for the next generation of solid state lighting, color displays, and other optoelectronic applications. Overcoating quantum dots (QDs) -- semiconducting nanocrystals of CdSe, PbS, or another similar compound -- with a wide band-gap …
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Lattice mismatched epitaxy of heterostructures for non-nitride green light emitting devices
… goal of achieving high brightness green to amber light emitting diodes (LEDs) and laser diodes (LDs). Unconventional compositions of aluminum indium gallium phosphide (AlInGaP), with lattice constants less than that of GaAs, offer improved electrical and optical characteristics over commonly used …
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Development of colloidal quantum dot and lead halide perovskite light emitting devices
… perovskites, have emerged as top candidates for light emitting materials. One key feature of these materials is their bandgap tunability, e.g. via size or chemical composition, allowing for their emission color to be turned throughout the entire visible spectrum. Thin-film light emitting devices …
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Photoluminescent quantum-dot light emitting devices controlled by electric field induced quenching
… applications for a new generation of display and lighting technologies. The emission control of QDs in a QD light-emitting device (LED) is usually achieved by changing the injection current density. However, these devices face issues with lifetime and stability as well as low external quantum …
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Light-emitting devices with polynorbornenes containing blue electroluminescent and charge-transport functional units
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1999.
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Efficient light emitting devices utilizing CdSe(ZnS) quantum dots in organic host matrices
… organic host materials. In the most efficient devices, excitons are created on the quantum dot sites via energy transfer from organic host molecules, and direct charge injection into the quantum dots is minimized. For quantum dots with core diameter 38 [Angstroms], the electroluminescence …
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Development of hybrid inorganic-organic light-emitting devices with metal oxide charge transport layers
Organic light emitting diodes (OLEDs) are currently being considered as the next generation technology in flat panel displays and solid state lighting applications. Among which, phosphorescent organic light emitting diodes (PhOLEDs) with nearly 100% internal quantum efficiency including other …
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Physical properties and design of light-emitting devices based on organic materials and nanoparticles
… experimental and theoretical characterization of light-emitting devices (LEDs) based on organic semiconductors and colloidal quantum dots (QDs). This hybrid material system has several advantages over crystalline semiconductor technology; first, it is compatible with inexpensive fabrication …
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Light-Matter Interactions in High-Efficiency Photovoltaics, Light-Emitting Devices, and Strongly Coupled Microcavities
The interactions of light and matter drive many of today’s devices, from electricity generation and consumption to manipulation. Within electricity generation, emerging thin film photovoltaics now rival traditional silicon-based solar cells in terms of power conversion efficiency (PCE) due to …
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