An undoped electrophosphorescent organic light-emitting diode is fabricated using a pure platinum(Ⅱ) (2-phenylpyridinato-N, Ca) (3-benzoyl-camphor) [(ppy)pt(bcam)] phosphorescent layer acting as the emittin...An undoped electrophosphorescent organic light-emitting diode is fabricated using a pure platinum(Ⅱ) (2-phenylpyridinato-N, Ca) (3-benzoyl-camphor) [(ppy)pt(bcam)] phosphorescent layer acting as the emitting layer. A maximum power efficiency Tlp of 6.621m/W and current efficiency of 14.78 cd/A at 745 cd/m2 are obtained from the device. The roll-off percentage of ηp of the pure phosphorescent phosphor layer device is reduced to 5% at a current density of 20mA/cm2, which is about 11% for conventional phosphorescent devices. The low roll-off efficiency is attributed to the phosphorescent material, which has the molecular structure of a strong steric hindrance effect.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 20472060.
文摘An undoped electrophosphorescent organic light-emitting diode is fabricated using a pure platinum(Ⅱ) (2-phenylpyridinato-N, Ca) (3-benzoyl-camphor) [(ppy)pt(bcam)] phosphorescent layer acting as the emitting layer. A maximum power efficiency Tlp of 6.621m/W and current efficiency of 14.78 cd/A at 745 cd/m2 are obtained from the device. The roll-off percentage of ηp of the pure phosphorescent phosphor layer device is reduced to 5% at a current density of 20mA/cm2, which is about 11% for conventional phosphorescent devices. The low roll-off efficiency is attributed to the phosphorescent material, which has the molecular structure of a strong steric hindrance effect.