白金錯体を用いた高効率・長寿命赤色リン光有機EL素子

摘要

The high efficient and stable red organic light emitting diodes (OLEDs) are necessary for color OLED display. There are many reports on the efficient phosphorescent OLEDs, the efficiency of which are higher than that of conventional fluorescent OLEDs, using Iridium complexes. On the other hand, little has been investigated the efficient phosphorescent materials other than those of Iridium complexes since the efficiency of the phosphorescent OLEDs using Iridium complexes tend to be higher than that of the phosphorescent OLEDs using metal complexes other than those of Iridium. In this research, we demonstrated highly efficient red phosphorescent OLED, and achieved the external quantum efficiency of about 20% with platinum complex. In addition, the stability of the OLED is improved by optimizing the device configuration.%有機ELディスプレイのフルカラー化のための課題として、赤色有機EL素子の高効率化・長寿命化が挙げられる．高効率化に有利なリン光を利用した赤色素子においては、イリジウム錯体を用いた報告が大多数を占めており、その他の材料ではイリジウム錯体ほどの高い効率は得られていない．本研究では、白金錯体を発光材料に用いた素子で、発光効率の理論限界値とされる20％程度の外部量子効率を実現した．また、素子構造の最適化を行うことで長寿命な素子を得ることができた．