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New Bipolar Green Emitting Material Based on Amino Coumarin Derivative with High Efficiency for Organic Light Emitting Diodes

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7-(4-([1,1′-biphenyl]-4-yl(9,9-dimethyl-9H-fluoren-2-yl)amino)phenyl)-4-methyl-2H-chromen-2-one (BPFA-MC) including coumarin moiety was synthesized through Suzuki aryl-aryl coupling reaction. Optical and electrical properties were examined by UV-visible absorption spectra, PL spectra, and AC-2. UV-visible spectrum of BPFA-MC in a film state showed maximum absorption wavelength of 367 nm. PL spectrum of BPFA-MC show maximum emission wavelength of 511 nm. BPFA-MC was used as non-doped emitting layer (EML) in OLEDs with the following structure: ITO/2-TNATA(60 nm)/NPB(15 nm)/BPFA-MC(35 nm)/Alq3(20 nm)/LiF(1 nm)/Al(200 nm). BPFA-MC showed highly efficient luminescence property. EL spectrum of BPFA-MC exhibited a maximum value of 504 nm and BPFA-MC device provided luminescence efficiency of 4.59 cd/A, power efficiency of 3.17 lm/W, and CIE (x, y) of (0.25, 0.53) at a current density of 10 mA/cm2.
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Keywords: Bipolar; Coumarin Derivative; Green Emitter; Organic Light Emitting Diodes

Document Type: Research Article

Affiliations: 1: Department of Chemical Engineering, Kyung Hee University, Gyeonggi-do, 17104, Republic of Korea 2: G-OLED Co.,Ltd., Seongshin Technopark, Yeongtong-ro, 323-38, Yeongtong-gu, Suwon 443-803, Korea

Publication date: August 1, 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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