Heat and water-resistant sol-gel synthesized quantum dot/methacryl siloxane phosphor composite material내열 내습 솔-젤 합성 양자점/메타크릴 실록산 형광 복합 재료

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dc.contributor.advisorBae, Byeong-Soo-
dc.contributor.advisor배병수-
dc.contributor.authorKim, Hwea Yoon-
dc.date.accessioned2019-08-25T02:41:35Z-
dc.date.available2019-08-25T02:41:35Z-
dc.date.issued2018-
dc.identifier.urihttp://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=734354&flag=dissertationen_US
dc.identifier.urihttp://hdl.handle.net/10203/264992-
dc.description학위논문(박사) - 한국과학기술원 : 신소재공학과, 2018.2,[ix, 126 p. :]-
dc.description.abstractI report the fabrication of a siloxane-encapsulated quantum dot (QD) film (QD/siloxane (methacryl) film), which contains thermally stable siloxane bonds and linkages between QD and siloxane matrix. With the help of both factors that create a synergy effect on the QD/siloxane (methacryl) film, which exhibits stable emission intensity for over 1 month even at elevated temperature and humidity compared to QD-commercial hydrocarbon based polymer film (QD/hydrocarbon (acryl) film) and QD/siloxane (epoxy) film, which has no bonding forms between QD and siloxane matrix. The QD/siloxane (methacryl) films are solidified via free radical addition reaction between methacryl functional group of siloxane resin and ligand molecules (oleic acid) on QDs. I prepare the QD/siloxane (methacryl) resin by non-hydrolytic sol-gel condensation reaction of silane precursors with QDs blended in the precursor solution, forgoing ligand-exchange of QDs. The resulting QD/siloxane (methacryl) resin remains optically clear after 40 days of storage, in contrast to other QD-containing commercial hydrocarbon-based polymer resin, which turn turbid and ultimately form sediments. QDs also disperse uniformly in the QD/siloxane (methacryl) film, whose photoluminescence (PL) quantum yield (QY) remains nearly unaltered under harsh conditions-
dc.description.abstractfor example, 85 °C/5% relative humidity (RH), 85 °C/85% RH, strong acidic, and strong basic environments for 40 days of aging time. The QD/siloxane (methacryl) film appears to remain equally emissive even after being immersed into boiling water (100 °C) and oxygen plasma treatment. Interestingly, the PL QY of the QD/siloxane (methacryl) film noticeably increases and it retains increased PL QY when the film is exposed to a moist environment, which opens a new, facile avenue to curing dimmed QD-containing films. In addition, this dissertation gives a way of improving photostability of QD-containing composite film. Given its excellent stability, the QD/siloxane (methacryl) film is best suited in display applications, particularly as a PL-type down-conversion layer.-
dc.languageeng-
dc.publisher한국과학기술원-
dc.subjectQuantum dots▼aSiloxane▼aSurface passivation▼aPhotoluminescence quantum yield▼aHeat and moisture stability-
dc.subject양자점▼a실록산▼a표면 보호막▼a발광 양자효율▼a열/수분 안정성-
dc.titleHeat and water-resistant sol-gel synthesized quantum dot/methacryl siloxane phosphor composite material-
dc.title.alternative내열 내습 솔-젤 합성 양자점/메타크릴 실록산 형광 복합 재료-
dc.typeThesis(Ph.D)-
dc.identifier.CNRN325007-
dc.description.department한국과학기술원 :신소재공학과,-
dc.contributor.alternativeauthor김회윤-
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