Bi- or ter-pyridine tris-substituted benzenes as electron-transporting materials for organic light-emitting devices

作者：Ichikawa M^*; Wakabayashi K; Hayashi S; Yokoyama N; Koyama T; Taniguchi Y

来源：Organic Electronics: physics, materials, applications , 2010, 11(12): 1966-1973.

DOI：10.1016/j.orgel.2010.09.004

• Bipyridine
• Electron transporting
• Hole blocking
• Mobility
• OLED
• Phosphorescent device

We demonstrated that 1,3,5-tris([2′,2′′]bipyridin- 6′-yl)benzene (BpyB) and 1,3,5-tris([2′,2′′, 6′′,2′′′]terpyridin-6'-yl)benzene (TpyB) are good electron-transport (ET) layer materials for organic light-emitting devices (OLEDs). The new materials exhibit high electron mobilities of around 10 -4 cm2 V-1 s-1, and OLEDs comprising the materials operate at lower voltage than the OLEDs with tris(8- hydroxyquinolinato) aluminum (Alq) as an ET material. The new materials are also useful for phosphorescent OLEDs in blue-, green-, and red-light-emitting devices, where they function as both electron-transporting and hole-blocking materials. Phosphorescent OLEDs with the new materials operate at lower voltage (while maintaining comparable external quantum efficiencies of electroluminescence) than does the corresponding reference device with bathocuproine/Alq as electron-transporting and hole-blocking layers.

• 单位
  1