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High‐Purity‐Blue and High‐Efficiency Electroluminescent Devices Based on Anthracene
Author(s) -
Kim Y.H.,
Jeong H.C.,
Kim S.H.,
Yang K.,
Kwon S.K.
Publication year - 2005
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200500051
Subject(s) - materials science , anthracene , chromaticity , electroluminescence , full width at half maximum , luminescence , indium tin oxide , optoelectronics , doping , quantum efficiency , luminous efficacy , photochemistry , analytical chemistry (journal) , optics , thin film , nanotechnology , organic chemistry , chemistry , physics , layer (electronics)
Novel blue‐light‐emitting materials, 9,10‐bis(1,2‐diphenyl styryl)anthracene (BDSA) and 9,10‐bis(4′‐triphenylsilylphenyl)anthracene (BTSA), which are composed of an anthracene molecule as the main unit and a rigid and bulky 1,2‐diphenylstyryl or triphenylsilylphenyl side unit, have been designed and synthesized. Theoretical calculations on the three‐dimensional structures of BDSA and BTSA show that they have a non‐coplanar structure and inhibited intermolecular interactions, resulting in a high luminescence efficiency and good color purity. By incorporating these new, non‐doped, blue‐light‐emitting materials into a multilayer device structure, it is possible to achieve luminance efficiencies of 1.43 lm W –1 (3.0 cd A –1 at 6.6 V) for BDSA and 0.61 lm W –1 (1.3 cd A –1 at 6.7 V) for BTSA at 10 mA cm –2 . The electroluminescence spectrum of the indium tin oxide (ITO)/copper phthalocyanine (CuPc)/1,4‐bis[(1‐naphthylphenyl)‐amino]biphenyl (α‐NPD)/BDSA/tris(9‐hydroxyquinolinato)aluminum (Alq 3 )/LiF/Al device shows a narrow emission band with a full width at half maximum (FWHM) of 55 nm and a λ max = 453 nm. The FWHM of the ITO/CuPc/α‐NPD/BTSA/Alq 3 /LiF/Al device is 53 nm, with a λ max = 436 nm. Regarding color, the devices showed highly pure blue emission (( x , y ) = (0.15,0.09) for BTSA, ( x , y ) = (0.14,0.10) for BDSA) at 10 mA cm –2 in Commission Internationale de l'Eclairage (CIE) chromaticity coordinates.