Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Light-Emitting Properties of Organic Electroluminescent Devices using Zinc Complexes

아연 착체를 이용한 유기 EL 소자의 전계발광 특성

  • Kim, Hong-Soo (Dep't of Chemical Engineering, Faculty of Env. & Chem. Eng., chungcheong University) ;
  • Jeong, Noh-Hee (School of Chem. engineering, Chungbuk Nat’l Univ.)
  • 김홍수 (충청대학 환경 화공학부) ;
  • 정노희 (충북대학교 공과대학 화학공학부)
  • Published : 2003.12.31
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Abstract

Zinc complexes with bis[2-(o-hydroxyphenyl) naphtol [1,2] oxazolato ligands (ZnPBO-4) and its derivatives (ZnPBO-S) were synthesized, and luminescent properties of these materials were investigated. Both the fluorescent emission band and electroluminescent emission band were discussed based on their ligand structure differences. The emission band found that it strongly depends on the molecular structure of introduced ligand. It was tuned from 446 nm to 491 nm by changing the ligand structures. Spreading of the ${\pi}$-conjugation in 2-(o-hydroxyphenyl) group gives rise to a blue shift. The EL properties also showed good consistency with their differences of ligand structure. Bright-blue EL emission with a maximum luminance of 3,100 $cd/m^2$ at 12V, current density, 575 $mA/m^2$ was obtained from the organic light-emitting diodes (OLEDs) using ZnPBO-4 as emitting layer. It was also found that the newly synthesized materials were suitable to be used as emitting materials in organic EL device.

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