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Efficient solution‐processed double‐layer red OLEDs based on a new europium complex with a carbazole group
Author(s) -
Liu Jian,
Miao JingSheng,
Wu HongBin
Publication year - 2015
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.2745
Subject(s) - oled , dopant , europium , biphenyl , carbazole , doping , luminous efficacy , materials science , luminance , layer (electronics) , analytical chemistry (journal) , photochemistry , optoelectronics , chemistry , luminescence , optics , nanotechnology , organic chemistry , physics
A new europium complex EuL 3 (Phen) was used as guest dopant, and a blend of Polyvinylcarbazole and 2‐(biphenyl‐4‐yl)‐5‐(4‐tert‐butylphenyl)‐1,3,4‐oxadiazole (PVK and PBD) as host matrix. Efficient red organic light‐emitting devices (OLEDs) with double‐layer structures were manufactured via a solution‐processed technique. The guest‐doped levels were 1, 3 and 5 wt% relative to the blend mass, respectively. For the 1 wt% doping‐level device, the luminous efficiency and luminance were up to 2.96 cd/A and 635.78 cd/m 2 with emissions from both EuL 3 (Phen) and from the host; for the 3 wt% doping‐level device, the maximum luminous efficiency and luminance were 1.01 cd/A and 370.91 cd/m 2 for the single emission from EuL 3 (Phen) only. Copyright © 2014 John Wiley & Sons, Ltd.
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