37.2: Efficiency Improvement of Fluorescent Blue Device by Molecular Orientation of Blue Dopant. Issue 1 (1st July 2013)

• Record Type: Journal Article
• Authors: Ogiwara, Toshinari; Ito, Hirokatsu; Mizuki, Yumiko; Naraoka, Ryo; Funahashi, Masakazu; Kuma, Hitoshi
• Is Part Of: Digest of technical papers. Volume 44:Issue 1(2013)
• Page Start: 515
• Page End: 518
• Publication Date: 2013-07-01
• Subjects: Information display systems -- Congresses; 621.3815422
• DOI: 10.1002/j.2168-0159.2013.tb06258.x
• Languages: English
• ISSNs: 0097-966X

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The relationship between molecular shape of fluorescent blue dopants (BDs) and molecular orientation factor was studied. BDs with larger ovality showed higher orientation factor and higher EQE over 10% in a fluorescent blue device. Impedance spectroscopy, transient EL spectroscopy and optical simulation results highly indicate that such high EQE is originated mainly from the optical effect of horizontal‐aligned BDs. Furthermore, a higher EQE of 11.5% at a current density of 10mA/cm² was successfully achieved by modifying molecular structure of BD.</p> </abstract>