Naphthalene Derivatives End-Capped with 2-(Diphenylamino)-9,9-Diethylfluorenes for Blue Organic Light-Emitting Diodes
- Authors
- Cho, Seokwon; Kim, Changmin; Lee, Song Eun; Kim, Young Kwan; Yoon, Seung Soo
- Issue Date
- Feb-2018
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Blue OLED; Fluorescence; Fluorene; Naphthalene
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.18, no.2, pp.1251 - 1255
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 18
- Number
- 2
- Start Page
- 1251
- End Page
- 1255
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/4036
- DOI
- 10.1166/jnn.2018.14890
- ISSN
- 1533-4880
- Abstract
- To investigate the electroluminescent (EL) properties of fluorescent materials based on fluorene-substituted naphthalene, multilayered OLEDs with the following sequence; indiumtin-oxide (ITO)/N, N'-di(1-naphthyl)-N, N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine (NPB) (50 nm)/Blue emitting materials (30 nm)/4,7-diphenyl-1,10-phenanthroline (Bphen) (30 nm)/lithium quinolate (Liq) (2 nm)/Al (100 nm) were fabricated using these materials as emitters. These devices exhibited blue emissions. Particularly, a device using 7-(1-(1-(2-(diphenylamino)-9,9-diethyl-9H-fluoren-7yl) naphthalen-4-yl) naphthalen-4-yl)-9,9-diethyl-N, N-diphenyl-9H-fluoren-2-amine as a blue emitting material exhibited blue emission with a luminous efficiency, a power efficiency, an external quantum efficiency, and CIE coordinates of 2.79 cd/A, 1.19 lm/W, 2.30% at 1,000 cd/m(2), and (0.14, 0.12) at 8.0 V, respectively. This study demonstrates that 2-(Diphenylamino)-9,9-diethylfluorenes endcapped naphthalene derivatives have the excellent properties for blue emitting materials for OLEDs.
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