Development of High-performance Organic Electroluminescent Devices Using Amorphous Molecular Materials

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Organic electroluminescent (EL) devices have received attention because of potential application to full color flat panel displays. There have been extensive studies on layred organic EL devices with the aim of achieving high brightness and multicolor emission. However, improvement in the luminance efficiency and durability of devices remains to be solved.We have been studying the synthesis, properties and applications of photo- and electro-active amorphous molecular materials which form readily amorphous glasses above room temperature. It is expected that the amorphous molecular materials function as hole transport materials of organic EL devices since they form stable amorphous film and exhibit relatively high hole drift mobility.In the present study, (1) we have designed and synthesized novel pi-electron starburst molecules and investigated the relationship between molecular structure and the ease of glass formation, glass stability, and glass-transition temperature, (2) we have investigated the hole transport properties of molecular glasses, and (3) we have fabricated layred organic EL devices using amorphous molecular materials as hole transport layr and found that the device exhibit significant durability. In addition, EL devices consisting of double hole transport layrs exhibits a high luminance efficiency. These results provide the novel strategy for developing organic EL devices with high stability and high luminance efficiency using amorphous molecular materials.