Spirobenzofluorene linked anthracene derivatives: Synthesis and application in blue fluorescent host materials
摘要:
Blue light-emitting anthracene-based host materials with a spiro[benzo[c]fluorene-7,9'-fluorene] core, 5-(10-(naphthalen-2-yl)anthracen-9-yl)spiro[ benzo[c]fluorene-7,9'-fluorene] (NA-SBFF) and 5-(10-(4(naphthalen-1-yl)phenyl)anthracen-9-yl)spiro[benzo[c]fluorene-7,9'-fluorenel (NPA-SBFF), were designed and synthesized via two-step Suzuki coupling reactions. Introduction of a spiro group into the structure of the anthracene moieties lead to a reduction in crystallization tendency, and a high glass transition temperature was observed. Typical blue fluorescent organic light emitting diodes with the configuration of ITO/N,N'-diphenyl-N,N'-bis[4-(phenyl-m-tolyl-amino)phenyl]biphenyl-4,4'-diamine (DNTPD)/N,N'-di(1-naphthyl)-N,N'-diphenylbenzidine (NPB)/HOST: Dopant/tris(8-hydroxyquinoline)aluminum (Alq(3))/LiF were developed using SBFF-type anthracene derivatives as a host material and N,N,N',N'-tetraphenylspiro [benzo[c]fluorene-7,9'-fluorene]-5,9-diamine (TPA-SBFF) as a dopant material. A device obtained from NA-SBFF doped with TPA-SBFF showed blue color purity of 0.146 and 0.167, a luminance efficiency of 8.65 cd/A, and an external quantum efficiency > 6.01% at 8.0 V. (C) 2012 Elsevier Ltd. All rights reserved.
COMPOUND AND ORGANIC LIGHT-EMITTING DEVICE INCLUDING THE SAME
申请人:SAMSUNG DISPLAY CO., LTD.
公开号:US20170054086A1
公开(公告)日:2017-02-23
When a decrease in low-grey level region (e.g., 0 to 80 grey) efficiencies of organic light emitting devices is not constant, deviation among display panels may cause color change and stain in the low luminance region. Aspects of the present disclosure are directed toward a compound to overcome this problem and an organic light-emitting device including the same. The compound may be represented by Formula 1:
Organic light-emitting devices including this compound in the buffer layer were found to have improved efficiencies at low grey levels.
The present invention generally discloses an organic compound and organic electroluminescence (herein referred to as organic EL) device using the organic compound. More specifically, the present invention relates to an organic EL device employing the organic compound as fluorescent emitting host or phosphorescent emitting host which can display long lifetime, high efficiency.