NDLI: Highly efficient near ultraviolet organic light-emitting diode based on a <i>meta</i>-linked donor

Content Provider	Royal Society of Chemistry (RSC)
Author	Yao, Liang Yang, Bing Li, Jinyu Li, Weijun Bai, Qing Zhang, Haiyan Zhang, Shitong Ma, Yuguang Gao, Yu Wang, Hongyan Liu, Haichao Xu, Hai Lu, Ping
Copyright Year	2015
Abstract	A novel near ultraviolet (NUV) emitter with a meta-linked donor–acceptor (D–A) structure between triphenylamine (TPA) and phenanthroimidazole (PPI), mTPA–PPI, was designed and synthesized. This molecular design is expected to resolve the conflict between the non-red-shifted emission and the introduction of a charge-transfer (CT) state in the D–A system, aiming at NUV organic light-emitting diodes (OLEDs) with high-efficiency and colour-purity. Theoretical calculations and photophysical experiments were implemented to verify the unique excited state properties of mTPA–PPI. The mTPA–PPI device exhibited excellent NUV electroluminescence (EL) performance with an emission peak at 404 nm, a full width at half maximum (FWHM) of only 47 nm corresponding to a CIE coordinate of (0.161, 0.049), and a maximum external quantum efficiency (EQE) of 3.33%, which is among the best results for NUV OLEDs. This work not only demonstrates the promising potential of mTPA–PPI in NUV OLEDs, but also provides a valuable strategy for the rational design of NUV materials by using the meta-linked D–A architecture.
Starting Page	3797
Ending Page	3804
Page Count	8
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	6
Issue Number	7
Journal	Chemical Science
DOI	10.1039/c5sc01131k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Quantum Full width at half maximum Electroluminescence Ultraviolet Triphenylamine
Content Type	Text
Resource Type	Article
Subject	Chemistry

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