title: Laminated Graphene Films for Flexible Transparent Thin Film Encapsulation.
abstract: We introduce a simple, inexpensive, and large-area flexible transparent lamination encapsulation method that uses graphene films with polydimethylsiloxane (PDMS) buffer on polyethylene terephthalate (PET) substrate. The number of stacked graphene layers (nG) was increased from 2 to 6, and 6-layered graphene-encapsulation showed high impermeability to moisture and air. The graphene-encapsulated polymer light emitting diodes (PLEDs) had stable operating characteristics, and the operational lifetime of encapsulated PLEDs increased as nG increased. Calcium oxidation test data confirmed the improved impermeability of graphene-encapsulation with increased nG. As a practical application, we demonstrated large-area flexible organic light emitting diodes (FOLEDs) and transparent FOLEDs that were encapsulated by our polymer/graphene encapsulant.
authors.affiliation: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang, Gyungbuk 790-784, Republic of Korea.
authors.forename: Hong-Kyu
authors.initials: HK
authors.lastname: Seo
authors.affiliation: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang, Gyungbuk 790-784, Republic of Korea.
authors.forename: Min-Ho
authors.initials: MH
authors.lastname: Park
authors.affiliation: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang, Gyungbuk 790-784, Republic of Korea.
authors.forename: Young-Hoon
authors.initials: YH
authors.lastname: Kim
authors.affiliation: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang, Gyungbuk 790-784, Republic of Korea.
authors.forename: Sung-Joo
authors.initials: SJ
authors.lastname: Kwon
authors.affiliation: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang, Gyungbuk 790-784, Republic of Korea.
authors.forename: Su-Hun
authors.initials: SH
authors.lastname: Jeong
authors.affiliation: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH) , Pohang, Gyungbuk 790-784, Republic of Korea.
authors.forename: Tae-Woo
authors.initials: TW
authors.lastname: Lee
keywords: flexible lamination encapsulation; graphene; lifetime; polymer light emitting diodes (PLED); water vapor transmission rate (WVTR)