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Novel 9,9 '-(1,3-Phenylene)bis-9H-carbazole-Containing Copolymers as Hole-Transporting and Host Materials for Blue Phosphorescent Polymer Light-Emitting Diodes

Authors
Yoon, Seung HeeShin, JicheolUm, Hyun AhLee, Tae WanCho, Min JuKim, Yong JaeSon, Young HoonYang, Joong HwanChae, GeesungKwon, Jang HyukChoi, Dong Hoon
Issue Date
1-3월-2014
Publisher
WILEY
Keywords
blue; copolymerization; crosslinking; curing of polymers; light-emitting diodes; luminescence; oxetane; phosphorescence; photo-crosslinking; polymer light-emitting diode; solution process; synthesis
Citation
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, v.52, no.5, pp.707 - 718
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume
52
Number
5
Start Page
707
End Page
718
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/99049
DOI
10.1002/pola.27054
ISSN
0887-624X
Abstract
Novel photo-crosslinkable hole-transport and host materials incorporated into multilayer blue phosphorescent polymer light-emitting diodes (Ph-PLEDs) were demonstrated in this study. The oxetane-containing copolymers, which function as hole-transport layers (HTL), could be cured by UV irradiation in the presence of a cationic photoinitiator. The composition of the two monomers was varied to yield three different hole-transporting copolymers, [Poly(9,9-(5-(((4-(7-(4-(((3-methyloxetan-3-yl)methoxy)methyl)phenyl)octan-3-yl)benzyl)oxy)methyl)-1,3-phenylene)bis(9H-carbazole)) (P(mCP-Ox)-I, -II, and -III)]. In addition, monomer 1 was copolymerized with styrene to produce copolymer P(mCP-Ph) as a host material for bis[2-(4,6-difluorophenyl)pyridinato-C-2,N](picolinato)iridium(III) (FIrpic), a blue-emitting dopant. All mCP-based copolymers displayed high glass transition temperatures (T-g) of up to 130-140 degrees C and triplet energies of up to 3.00 eV. The blue Ph-PLEDs exhibited a maximum external quantum efficiency of 2.55%, in addition to a luminous efficiency of 8.75 cd A(-1) when using the device configuration of indium tin oxide/poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)/P(mCP-OX)-III/P(mCP-Ph):FIrpic(15wt%)/3,3-[5-[3-(3-pyridinyl)phenyl][1,1:3,1-terphenyl]-3,3-diyl]bispyridine/LiF/Al. The device bearing P(mCP-Ox)-III HTL, containing the highest composition of mCP unit, exhibited better performance than the other devices, which is attributed to induction of more balanced charge carriers and carrier recombination in the emissive layer. (c) 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 707-718
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