Development of Phenylpyridine-Containing Wide-Energy-Gap Electron-Transporters for High Performance OLEDs

作者：Sasabe Hisahiro^*

来源：Kobunshi Ronbunshu, 2013, 70(8): 360-369.

DOI：10.1295/koron.70.360

• Organic Light-Emitting Device
• Phosphorescent Materials
• Excited Triplet Energy
• Phenylpyridine Derivatives
• Pyrimidine
• Electron Transporter
• Molecular Orientation
• Weak Hydrogen Bonding Interaction

High-efficiency organic light-emitting devices (OLEDs) have received considerable attention as energy-saving next-generation light-sources. So far, we have developed a series of phenylpyridine-containing multifunctional electron-transport materials (ETMs) for realizing high-efficiency phosphorescent OLEDs. These ETMs have high triplet energy (E-T1), over 2.75 eV for blue phosphorescent OLEDs, deep electron affinity for high electron-injection efficiency, high electron mobility of up to 10(-4) cm(2)/Vs and high hole-blocking ability (ionization potential around -6.5 similar to -7.0 eV). By using these ETMs, we have successfully developed high-performance phosphorescent OLEDs with 52 lm/W for white, 57 lm/W for sky-blue, 133 lm/W for green at 100 cd/m(2) without any outcoupling enhancement. Among these ETMs, a series of pyrirnidine-based ETMs shows interesting thermal/optical properties, electron mobilities and molecular orientations, depending on the nitrogen position on the peripheral pyridine rings.

• 出版日期2013