Colloidal photonics of semiconductor nanocrystals: from polarized color conversion to efficient solar concentration

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buir.advisorDemir, Hilmi Volkan
dc.contributor.authorGüngör, Kıvanç
dc.date.accessioned2018-07-31T08:57:31Z
dc.date.available2018-07-31T08:57:31Z
dc.date.copyright2018-07
dc.date.issued2018-07
dc.date.submitted2018-07-30
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
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, 2018.en_US
dc.descriptionIncludes bibliographical references (leaves 145-161).en_US
dc.description.abstractEffective photon management is pivotal to the success of future photonic applications. The demand for high-performance electronic displays and solar light harvesters has been increasingly growing, ever with high expectations in advancing their power efficiencies. Semiconductor nanocrystals are highly promising for use in such advanced photonic applications. However, conventional device architectures and fabrication methods cannot fully exploit their potential. To address the need for their effective utilization, in this thesis, we proposed and demonstrated novel photon managing methods for colloidal nanocrystals to target polarized color conversion and efficient solar concentration. Nanocrystals possess an unmatched color purity for next-generation displays but color enrichment in displays suffers from the inherent random polarization in their photoluminescence. Instead of clipping the undesired polarization, we show a new class of v-shaped backlight unit (v-BLU) creating Fano resonances to enforce isotropic quantum emitters of the integrated color-conversion nanocrystals to emit polarized light. While enabling a front-panel configuration, the proposed v-BLU of nanocrystals allows for a strong modification of the density of optical states via resonance coupling. This control over the density of states for isotropic quantum dots empowers the realization of high polarization contrast ratios while sustaining their optical transmission. Similar to color conversion, colloidal nanocrystals are also instrumental to light harvesting, in particular using atomically at nanocrystals with their step-like absorption profile making them potentially ideal candidates for luminescent solar concentrators (LSCs). Nevertheless, practically zero Stokes shift in their photoluminescence fundamentally limits their utilization. Here we overcame this limitation by proposing the doping of such colloidal quantum wells inducing a large Stokes shift with near-unity photoluminescence quantum efficiency. We developed and demonstrated high-performance LSC panels of the copper-doped quantum wells outperforming the LSCs of their undoped counterparts and doped quantum dots. The LSCs of such Cu-doped quantum wells offer record optical flux gain compared to other colloids. We believe that the findings presented in this thesis will advance the applications of colloidal nanocrystals boosting the performance of their next-generation photonic devices to unprecedented levels.en_US
dc.description.degreePh.D.en_US
dc.description.provenanceSubmitted by Betül Özen (ozen@bilkent.edu.tr) on 2018-07-31T08:57:31Z No. of bitstreams: 1 PhD Thesis - Kivanc Gungor.pdf: 5662266 bytes, checksum: bf1d1735ac476010c9068219ee111e71 (MD5)en
dc.description.provenanceMade available in DSpace on 2018-07-31T08:57:31Z (GMT). No. of bitstreams: 1 PhD Thesis - Kivanc Gungor.pdf: 5662266 bytes, checksum: bf1d1735ac476010c9068219ee111e71 (MD5) Previous issue date: 2018-07en
dc.description.statementofresponsibilityby Kıvanç Güngör.en_US
dc.embargo.release2019-01-30
dc.format.extentxviii, 161 leaves : illustrations (some color), graphics ; 30 cm.en_US
dc.identifier.itemidB158743
dc.identifier.urihttp://hdl.handle.net/11693/47698
dc.language.isoEnglishen_US
dc.publisherBilkent Universityen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectSemiconductor Nanocrystalsen_US
dc.subjectColloidal Quantum Dotsen_US
dc.subjectColloidal Quantum Wellsen_US
dc.subjectNanoplateletsen_US
dc.subjectPhoton Managementen_US
dc.subjectColor Conversionen_US
dc.subjectPolarized Light Generationen_US
dc.subjectLight Harvestingen_US
dc.subjectLuminescent Solar Concentrationen_US
dc.titleColloidal photonics of semiconductor nanocrystals: from polarized color conversion to efficient solar concentrationen_US
dc.title.alternativeYarıiletken nanokristallerin koloidal fotoniği: polarize renk dönüşümünden verimli günes ışığı yoğunlaştırılmasınaen_US
dc.typeThesisen_US

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