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dc.contributor.advisorDemir, Hilmi Volkan
dc.contributor.authorErdem, Talha
dc.date.accessioned2016-08-23T06:51:41Z
dc.date.available2016-08-23T06:51:41Z
dc.date.copyright2016-08
dc.date.issued2016-08
dc.date.submitted2016-08-03
dc.identifier.urihttp://hdl.handle.net/11693/32156
dc.descriptionCataloged from PDF version of article.en_US
dc.descriptionThesis (Ph.D.): Bilkent University, Department of Electrical and Electronics Engineering, İhsan Doğramacı Bilkent University, 2016.en_US
dc.descriptionIncludes bibliographical references (leaves 194-216).en_US
dc.description.abstractStarting with the modern times, lighting has become an essential part of our lives. Today, its share of the total energy consumption reaching 15% should not surprise us. This share further increases when the energy demand for display backlighting is taken into account. Therefore, increasing the effciency of the lighting sources is of significant importance for decreasing the carbon footprint for a sustainable environment. At this point, light-emitting diodes (LEDs) step forward as the most important candidate for revolutionizing the existing lighting systems; however, the current conventional technologies, which typically employ rare-earth ion based broad-band emitters, are plagued with low photometric effciency, lack of light quality, and incapability of the spectrum design for application-specific performance. As a remedy to these problems, in this thesis we study light-emitting diodes of quantum dots that are effcient narrow-band emitters as opposed to phosphors. These colloidal quantum dots allow for the achievement of the light source performance specific to each application. By employing this strength, we first present our design of quantum dot integrated LED display backlight for reducing the adverse effects of the displays on the human biological rhythm while maximizing the color definition. Here we also addressed the need for light sources exhibiting polarization anisotropy for display backlights by hybridizing self-assembled magnetic nanowires and quantum dots. To solve the emission stability problem of the quantum dots in solid-films, we demonstrated the incorporation of the quantum dots within crystalline matrices that act as a barrier against oxygen and humidity and substantially increase their emission stability. Another important strength of this technique has been the preservation of the dispersion quantum effciencies of the quantum dots in powder form and in solid-films. By employing these material systems, we designed and successfully demonstrated a warm white LED exhibiting successful color rendition capability and large spectral overlap with the human eye sensitivity function. We also showed that embedding quantum dots into crystalline matrices offers a robust platform to study the excitonic and plasmonic interactions, both of which we utilized for increasing the effciencies of the quantum dots in crystalline matrices. To meet the need for non-toxic color converter enabling color tuning, we also employed conjugated polymer nanoparticles and studied their near-field interaction with epitaxially grown quantum well nanopillars to boost their emission intensity. We believe that the materials and light sources that we presented in this thesis will enable to reach the targets for realizing high-effciency but also high-quality light sources for general lighting and displays.en_US
dc.description.statementofresponsibilityby Talha Erdem.en_US
dc.format.extentxxvii, 216 leaves : charts.en_US
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectWhite light-emitting diodes (WLED)en_US
dc.subjectNanocrystalsen_US
dc.subjectQuantum dotsen_US
dc.subjectNjugated polymer nanoparticlesen_US
dc.subjectMacrocrystalsen_US
dc.subjectExcitonicsen_US
dc.subjectPlasmonicsen_US
dc.subjectColor science and photometryen_US
dc.titleNovel light-emitting devices of semiconductor quantum dots and conjugated polymer nanoparticlesen_US
dc.title.alternativeYarı iletken kuantum noktacıkları ve konjüge polimer nanoparçacıkların yenilikçi ışık yayan aygıtlarıen_US
dc.typeThesisen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.publisherBilkent Universityen_US
dc.description.degreePh.D.en_US
dc.identifier.itemidB153727
dc.embargo.release2018-07-20


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