Global ETD Search
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 33 for “"organic light-emitting devices"”.
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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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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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Measurement and control of exciton spin in organic light emitting devices
Organic semiconductors are a promising new 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 …
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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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Investigation of phosphines as potential host materials in blue dye-doped organic light emitting devices
Currently, the most efficient organic light emitting devices (OLEDs) are based on dye-doped OLEDs. The major obstacle has been developing a host material for blue OLEDs that has sufficiently high energy of emission (<380nm) to facilitate energy transfer to the dye. Previous studies of …
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Evaluation of solid-state light-emitting devices based on the tris-chelated ruthenium (II) complexes
Organic light-emitting devices have the potential to create a new range of applications. They are versatile because their physical properties (color, emission efficiency) can be fine-tuned by the manipulation of their chemical structures. In this work, the novel technology of Ru(bpy)t-based devices …
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Optical modeling of organic electronic devices
Organic materials, with their superior photoluminescence and absorbance properties have revolutionized the technologies for displays and solar energy conversion. Due to the large transition dipoles, the localization of excited states or excitons in organic materials necessitates optical models that …
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Improving OLED technology for displays
Organic light emitting devices (OLEDs) are brightly emissive, efficient, have fast switching speeds, and are paper-thin in format, propelling their use as an emerging flat panel display technology. However, two primary challenges prevent OLEDs from dominating the large-area display market: the …
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Palladium-catalyzed C-N cross-coupling and application to the synthesis of delayed singlet emitters for OLED development
… be used as delayed singlet emitters for organic light emitting devices. Chapter 1. Palladium-Catalyzed Amidation of Five-Membered Heterocyclic Bromides Palladium-catalyzed C-N cross-coupling between primary amides and five-membered heterocyclic bromides that contain multiple heteroatoms …
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The establishment of the oligomeric purity and molecular structure for n-methylated bis(8-hydroxyquinoline) zinc (n = 0, 2, 4, and 5)
… vapor deposition, which is used to create organic light emitting devices, do not break up the higher molecular order oligomer.
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Electrical and optical characterization of colloidal silicon nanocrystals
… to fabricate highly efficient hybrid nanocrystal-organic light-emitting-devices (NC-OLEDs) that emit in red or near infrared spectrum. Despite reports of outstanding device performance, the underlying mechanism of this high efficiency remains unknown. Consequently, this thesis focuses on studying …
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Further investigation of mental tris-quinolates using spectroscopy
… (Mq3) in vapor deposited films in organic light emitting devices (OLEDs) is not well established due to the possibility of existing two geometric isomeric forms, meridianal and facial. We present a comparative analysis of 1H and 13C NMR of nMeq3M's (n = 0, 2, 4, 5) made from thermal …
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Characterization of 2-methyl-8-quinolinolato gallium (Iii) chelates
… materials when used as emitter materials in organic light emitting devices. We also present the first detailed evaluation in to the mer/fac isomerization of gallium (III) tris(2-methyl-8-quinolinolato) (2Meq3Ga) chelate in both solution and solid state, using 1H NMR and thermal studies. …
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Substitution effects of metal quinolate chelate materials for organic electroluminescence applications
… displays is based on electroluminescence (EL) of organic light-emitting devices (OLEDs). Aluminum tris(8-hydroxy quinoline) (Alq3)-type materials are very important as emitter materials in OLEDs. Systematic experimental and theoretical studies of these materials are crucial in order to elucidate …
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Synthesis and charaterisation of phosphorescent copper (I) complexes for light emitting devices
… the 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 …
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Inkjet printing for fabrication of organic photonics and electronics
Organic light-emitting devices (OLEDs) are traditionally patterned either through vacuum deposition masks or by UV lithographs. However, such patterning routes are relatively expensive, time consuming, and geometry limited. On the other hand, developments in the use of inkjet printing as a tool to …
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Novel patterning techniques for manufacturing organic and nanostructured electronics
Molecular organic semiconductors and nanometer size particles are two new classes of functional materials allowing fabrication of electronic devices on low-cost and large area substrates. Patterning these electronic materials requires the development of unconventional techniques, and the scientific …
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Comparative study of zinc bis-quinolates and lithium mono-quinolates: Investigation of the effect of coordination geometry on electroluminescence performance
… chelates have proven to be viable for use in organic light-emitting devices (OLEDs), both as the active emitter layer and as the electron-transporting host in dye-doped OLEDs. Whether serving as the emitter layer or host material the energy level-alignment affecting charge injection efficiency …
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Engineering J-aggregate cavity exciton-polariton devices
Research efforts in solution-based dye lasers and organic light-emitting devices (OLEDs) have led to advances in materials engineering and fabrication technology, propelling the field of organic solid-state photonics. Active areas of photonic research in organic systems include solid-state lasers …
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Grafted poly(phenylene-ethynylene) : optical and optoelectronic applications
… the design and fabrication of new PPE based organic light emitting devices (OLEDs). Chapter 5 discusses the development of a new hybrid OLED system whereby energy transfer from a hole-transport host to grafted PPEs results in efficient, blue PPE electroluminescence (EL) that matches the …
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