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Efficient Electroluminescence from Excimers of 1,3,6,8‐Tetrakis(3,5‐dimethylphenyl)pyrene
Author(s) -
Chang Zhengfeng,
Ye Shanghui,
He Bairong,
Bei Zirong,
Lin Liya,
Lu Ping,
Chen Bin,
Zhao Zujin,
Qiu Huayu
Publication year - 2013
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.201200932
Subject(s) - bathochromic shift , electroluminescence , pyrene , chromophore , excimer , photochemistry , oled , photoluminescence , materials science , fluorescence , quenching (fluorescence) , chemistry , optoelectronics , optics , organic chemistry , layer (electronics) , nanotechnology , physics
Excimers are generally considered as detrimental to OLEDs. For pyrene‐based chromophores, however, this is not always true. In this contribution, two new methylated tetraphenylpyrenes, 1,3,6,8‐tetra‐ o ‐tolylpyrene (TTPy) and 1,3,6,8‐tetrakis(3,5‐dimethylphenyl)pyrene (TDMPPy), were synthesized through Suzuki coupling reactions . TDMPPy absorbs and emits light at longer wavelengths than TTPy due to its more planar conformation and thus better conjugation. TDMPPy is prone to excimer formation, thus leading to a strong bathochromic shift (84 nm) in the photoluminescence spectrum of its film. TDMPPy exhibits efficient electroluminescence originating from pyrene excimers, affording a maximum luminance of 26 670 cd m −2 and a current efficiency as high as 10.8 cd A −1 in a non‐doped OLED (ITO/PEDOT:PSS (50 nm)/NPB (30 nm)/TDMPPy (30 nm)/TPBI (40 nm)/Ca:Ag).