Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Electroluminescence Characteristics of a New Green-Emitting Phenylphenothiazine Derivative with Phenylbenzimidazole Substituent

  • Ahn, Yeonseon (Department of Chemical Engineering, Kyung Hee University) ;
  • Jang, Da Eun (Department of Applied Chemistry, Kyung Hee University) ;
  • Cha, Yong-Bum (Department of Applied Chemistry, Kyung Hee University) ;
  • Kim, Mansu (Department of Chemical Engineering, Kyung Hee University) ;
  • Ahn, Kwang-Hyun (Department of Applied Chemistry, Kyung Hee University) ;
  • Kim, Young Chul (Department of Chemical Engineering, Kyung Hee University)
  • Received : 2012.09.17
  • Accepted : 2012.10.12
  • Published : 2013.01.20
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Abstract

A new green-emitting material with donor-acceptor architecture, 3,7-bis(1'-phenylbenzimidazole-2'-yl)-10-phenylphenothiazine (BBPP) was synthesized and its thermal, optical, and electroluminescent characteristics were investigated. Organic light-emitting diodes (OLEDs) with four different multilayer structures were prepared using BBPP as an emitting layer. The optimized device with the structure of [ITO/2-TNATA (40 nm)/BBPP (30 nm)/TPBi (30 nm)/Alq3 (10 nm)/LiF (1 nm)/Al (100 nm)] exhibited efficient green emission. Enhanced charge carrier balance and electron mobility in the organic layers enabled the device to demonstrate a maximum luminance of 31,300 cd/$m^2$, a luminous efficiency of 6.83 cd/A, and an external quantum efficiency of 1.62% with the CIE 1931 chromaticity coordinates of (0.21, 0.53) at a current density of 100 mA/$cm^2$.

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