Synthesis and Electron Transport Layer Properties of Zinc Metallic Complexes Containing Quinoline Moieties in OLED

Abstract

Metal chelate complexes are often studied as a carrier transport material in OLEDs, because they have a good electron transport property. We have synthesized metal chelate complexes, Bis(8-hydroxyquinolinato)zinc (Znq₂) and Bis(10-hydroxybenzo[h]quinolinato)zinc (Zn(bq)₂) as well as Bis(10-hydroxybenzo[h]quinolinato)beryllium Be(bq)₂ and compared EL performance with commercialized Alq₃.

We will report the basic EL performance of synthesized complex materials such as EL spectrum, current efficiency and CIE value. When we applied Znq₂ and Zn(bq)₂ to conventional blue OLED device, the device exhibited better power efficiency of 0.4 lm/w and 0.28 lm/w compared to 0.2 lm/w of Alq₃ device. We also introduce overall EL performance of metal chelate device including Be(bq)₂.

Keywords:

• electron transport layer
• metal chelate
• OLED
• quinoline
• zinc complex

Acknowledgments

This study was supported by the Research Fund, 2007 The Catholic University of Korea.