A thermally stable imidazole type ligand based Be complex as a triplet host material of green phosphorescent organic light emitting diodes

作者：Oh Chan Seok; Lee Jun Yeob^*

来源：Organic Electronics, 2015, 24: 315-319.

DOI：10.1016/j.orgel.2015.05.002

• Be complex
• Thermal stability
• Triplet energy
• Quantum efficiency
• Green device

A 2-(4,5-dimethyl-1-phenyl-imidazol-2-yl) phenol ligand based Be complex, beryllium 2-(4, 5-dimethyl-1-phenyl-imidazol-2-yl) phenolate (BePhIm), was investigated as a thermally stable host material of green phosphorescent organic light-emitting diodes (PHOLEDs). BePhIm was developed as a host material to have high triplet energy, thermal stability and balanced charge density. The triple energy of BePhIm was 2.73 eV and the glass transition temperature was 181 degrees C. Maximum quantum efficiency of the BePhIm based green PHOLEDs was 25.9%, which is better than any other quantum efficiency reported in green PHOLED using Be complexes as the host material.

• 出版日期2015-9