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3‐(9‐Carbazolyl)carbazoles and 3,6‐Di(9‐carbazolyl)carbazoles as Effective Host Materials for Efficient Blue Organic Electrophosphorescence
Author(s) -
Tsai M.H.,
Hong Y.H.,
Chang C.H.,
Su H.C.,
Wu C.C.,
Matoliukstyte A.,
Simokaitiene J.,
Grigalevicius S.,
Grazulevicius J. V.,
Hsu C.P.
Publication year - 2007
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200600822
Subject(s) - monomer , materials science , excited state , host (biology) , carbazole , optoelectronics , topology (electrical circuits) , photochemistry , polymer , chemistry , physics , electrical engineering , atomic physics , ecology , composite material , biology , engineering
Linking topology in oligocarbazoles (see figure) has a strong influence on their electronic properties. 3(6),9′‐linked oligocarbazoles exhibit unusual suppression of electronic coupling between units, leading to localized excited states and very small reduction of triplet energies (compared to the monomer). Coupled with their excellent morphological stability, this makes them suitable as host materials for blue electrophosphorescence devices.