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

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I 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; for 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.
Advisors
Bae, Byeong-Sooresearcher배병수researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2018.2,[ix, 126 p. :]

Keywords

Quantum dots▼aSiloxane▼aSurface passivation▼aPhotoluminescence quantum yield▼aHeat and moisture stability; 양자점▼a실록산▼a표면 보호막▼a발광 양자효율▼a열/수분 안정성

URI
http://hdl.handle.net/10203/264992
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=734354&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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