Res. Chem. Intermed.
, Vol. 34, No. 2–3, pp. 299–308 (2008)
Koninklijke Brill NV, Leiden, 2008.
Also available online - www.brill.nl/rci
Synthesis, photophysical and electroluminescent properties
of novel naphthalimide derivatives containing an
, GAOYU ZHONG
, SHUPING JING
and WEIHONG ZHU
Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of
Science and Technology, Shanghai 200237, P. R. China
Department of Material & Chemical Engineering, Guilin University of Technology, Guilin 541004,
P. R . C h i na
Laboratory of Advanced Materials, Fudan University, Shanghai 200433, P. R. China
Received 8 November 2006; accepted 15 January 2007
Abstract—A series of naphthalimide derivatives containing a benzoazole unit (benzothiazole, ben-
zoxazole or benzimidazole) as electron-transporting unit was designed and synthesized, and their
photophysical and electroluminescent properties were investigated. The key design of molecular
structures included the use of carrier-transporting fragments, together with twisted molecular con-
formation that could eliminate the recrystallization tendency and favour the formation of a stable
amorphous state. ITO/NPB/emissive layer/Mg:Ag/Ag bilayer electroluminescent devices were fabri-
cated. Green or yellow-green electroluminescence was obtained successfully with peak emission in
the range 530–560 nm.
Keywords: Naphthalimide; benzothiazole; benzoxazole; benzimidazole; organic light-emitting diodes.
Organic light-emitting diodes (OLEDs) have attracted worldwide attention for their
potential application in large area ﬂat displays [1–3]. Up to date, research efforts
have been directed towards the improvement of OLEDs by means of molecular
engineering and device conﬁguration [4–9]. However, the challenge including
maximization of the external quantum efﬁciency (EQE), design and synthesis of
new materials for turnable colours, and modes of addressing devices for a full-
colour display with optimized resolution still remains.
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