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Efficient blue organic light‐emitting diodes using N 2 ,N 2 ,N 11 ,N 11 ,5,6,7,8‐octaphenyltriphenylene‐2,11‐diamine derivatives
Author(s) -
Kim Young Seok,
Jeong Su Jin,
Lee Hyun Woo,
Kim Jwajin,
Lee Song Eun,
Kim Young Kwan,
Yoon Seung Soo
Publication year - 2016
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3070
Subject(s) - electroluminescence , diamine , oled , indium tin oxide , materials science , triphenylene , phosphorescence , quantum efficiency , analytical chemistry (journal) , fluorescence , chemistry , nuclear chemistry , optoelectronics , polymer chemistry , electrode , nanotechnology , physics , optics , organic chemistry , liquid crystal , layer (electronics)
In this study, we have synthesized phenyl‐substituted triphenylene derivatives, using the Diels–Alder reaction and the Buchwald–Hartwig reaction. To investigate electroluminescence properties of these materials, multilayer organic light‐emitting diode (OLED) devices were fabricated with a structure of indium–tin–oxide (ITO) (180 nm)/4,4′‐bis( N ‐(1‐naphthyl)‐ N ‐phenylamino)biphenyl (NPB) (50 nm)/blue‐emitting materials (1–3) (30 nm)/bathophenanthroline (Bphen) (35 nm)/lithium quinolate (Liq) (2 nm)/Al (100 nm). A device using N 2 ,N 2 ,N 11 ,N 11 ,5,6,7‐heptaphenyltriphenylene‐2,11‐diamine (2) exhibited efficient blue emission with luminous, power, and external quantum efficiencies of 0.92 cd/A, 0.67 lm/W, and 1.17% at 20 mA/cm 2 , respectively. The Commission International de L'Éclairage coordinates of this device were (x = 0.15, y = 0.09) at 6.0 V. Copyright © 2015 John Wiley & Sons, Ltd.