Kumar, Amit and Palai, Akshaya K. and Srivastava, Ritu and Kadyan, Pratap S. and Kamalasanan, Modeeparampil N. and Singh, Ishwar (2014) n-Type ternary zinc complexes: Synthesis, physicochemical properties and organic light emitting diodes application. Journal of Organometallic Chemistry, 756. -46. ISSN 0022-328X

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Abstract

We report synthesis, characterization and use of ternary zinc complexes as emissive and electron transport material in organic light emitting devices (OLED). 5,7-Dimethyl-8-hydroxyquinoline or 2-carbonitrile-8-hydroxyquinoline have been used with 2-(2-hydroxyphenyl)benzoxazole to synthesize (2-(2-hydroxyphenyl)benzoxazolato) (5,7-dimethyl-8-hydroxyquinolinato)zinc(II) [Zn(HPB)(Me(2)q)] and (2-(2-hydroxyphenyl) benzoxazolato)(2-carbonitrile-8-hydroxyquinolinato)zinc(II) [Zn(HPB)(CNq)] complexes. These complexes possessed high thermal stability and having good film forming property. Optical properties of the synthesized complexes have been studied by UV-visible absorption, photoluminescence and time resolved photo-luminescence spectroscopy. Density functional theoretical calculations have been performed to demonstrate the three-dimensional geometries and the frontier molecular orbital energy levels of these compounds. Synthesized materials show quite good efficiency in multilayered device structure ITO/alpha-NPD/Zinc complex/BCP/Alq(3)/LiF/Al with maximum brightness of 7017 cd/m(2) and 6925 cd/m(2) having electroluminescence spectral peak emission centered at 567 nm and 569 nm, respectively. Electron mobility of these molecules were found to be 1.5 x 10(-6)-1.2 x 10(-5) cm(2)/V s for electric field range 1000-1200 (V/cm)(1/2) and hence showed very high efficiency as electron transport layer in device structure ITO/alpha-NPD/5% Ir(ppy)(3) doped CBP/BCP/Zn(HPB)(Me(2)q) or Zn(HPB)(CNq)/LiF/Al.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/S Elsevier.
Uncontrolled Keywords:	Zinc complex Fluorescence lifetime Transient electroluminescence Electron transport material
Subjects:	Chemistry
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	29 Oct 2015 10:57
Last Modified:	29 Oct 2015 10:57
URI:	http://npl.csircentral.net/id/eprint/1440

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