Functional polymer surface passivated zinc oxide hybrid nanomaterial as an efficient cathode interfacial layer for solution processable OLEDs기능성 고분자로 표면개질된 산화아연 하이브리드 나노재료의 용액공정 OLED를 위한 음극계면층으로의 응용

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In this dissertation, functional polymer passivated colloidal zinc oxide hybrid nanomaterials have been investigated with conjugated polyelectrolyte and polyethyleneimine polymers, respectively, for the purpose of cathode interfacial layer for solution processable OLEDs. For the case of conjugated polyelectrolyte passivated zinc oxide hybrid nanomaterial, alkoxy side-chain tethered polyfluorene polymer has been synthesized and adopted to surfactant of zinc oxide. Conjugat-ed polyelectrolyte hybridized zinc oxide nanomaterials show good miscibility and higher colloidal stability. Form x-ray photoelectron spectroscopy analysis indicates that oxygen atom and bromide anion on conjugat-ed polyelectrolyte passivated the surface oxygen vacancy of zinc oxide nanoparticle, leading to formulate conjugated polyelectrolyte covering structure on zinc oxide nanoparticle. Solution processable OLED with SY-PPV emitting polymer and conjugated polyelectrolyte hybridized zinc oxide nanomaterials demonstrat-ed 11.7 cd $A^{-1}$ and 8.6 lm $W^{-1}$ performances which are 1.6 (1.6)-fold and 2.5 (3.9)-fold improved values compared with conjugated polyelectrolyte only (zinc oxide only) devices. These results are mainly due to reduced electron injection barrier of zinc oxide after conjugated polyelectrolyte implanted and reduced pho-toluminescence quenching property of emissive layer which directly contracted with cathode interfacial lay-ers. Secondly, for polyethyleneimine hybridized zinc oxide hybrid nanomaterials, zinc oxide colloidal nanoparticles are passivated by coordination bonding with nitrogen atoms from polyethyleneimine and oxy-gen vacancy of zinc oxide nanoparticle confirmed by x-ray photoelectron spectroscopy and photophysical properties of colloidal state hybrid nanomaterials. Applying as cathode interfacial layer, polyethyleneimine hybridized zinc oxide nanomaterials show 13.3 cd $A^{-1}$ and 11.7 lm $W^{-1}$ which is improved compared with conjugated polyelectrolyte hybridized zinc oxide nanomaterial device. Furthermore, it is comparable to vac-uum processed LiF device (14.1 cd $A^{-1}$, 12.1 lm $W^{-1}$) and shows reliably in performances. Considering poly-ethyleneimine hybridized zinc oxide nanomaterial devices (electron only and electron blocking layer em-ployed devices) show enhanced properties, polyethyleneimine zinc oxide hybrid nanomaterials have effi-cient electron injection capability than LiF.
Advisors
Jeon, Duk Youngresearcher전덕영researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2016.2,[viii, 90 p. :]

Keywords

zinc oxide nanoparticle▼aconjugated polyelectrolyte▼apolyethyleneimine▼asurface passivation induced hybrid nanomaterial▼asolution processable OLEDs; 산화아연 나노입자▼a공액고분자 전해질▼a폴리에틸렌이민▼a표면개질 유도 하이브리드 나노재료▼a용액공정 OLEDs

URI
http://hdl.handle.net/10203/265016
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=849823&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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