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Carbazolyl Benzo[1,2‐ b :4,5‐ b ′]difuran: An Ambipolar Host Material for Full‐Color Organic Light‐Emitting Diodes
Author(s) -
Mitsui Chikahiko,
Tsuji Hayato,
Sato Yoshiharu,
Nakamura Eiichi
Publication year - 2012
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201200062
Subject(s) - homojunction , ambipolar diffusion , optoelectronics , oled , materials science , diode , heterojunction , electron , nanotechnology , physics , layer (electronics) , quantum mechanics
We have designed an ambipolar material, 3,7‐bis[4‐( N ‐carbazolyl)‐phenyl]‐2,6‐diphenylbenzo[1,2‐ b :4,5‐ b ′]difuran (CZBDF), and synthesized it by zinc‐mediated double cyclization . Its physical properties clarified that CZBDF possesses a wide‐gap character, well‐balanced and high hole and electron mobilities of larger than 10 −3 cm 2 V −1 s −1 , and a high thermal stability . Using CZBDF as a host material for heterojunction OLED devices, a full range of visible emission was obtained. Notably, CZBDF also enabled us to fabricate RGB‐emitting homojunction OLEDs, with performances comparable or superior to the heterojunction devices composed of several materials.