[15p-E402-1~18] 12.4 Organic light-emitting devices and organic transistors

▲ [15p-E402-11] Pyrimidine end-capped electron-injection/transport materials aiming for stable phosphorescent OLEDs

〇Yuhui Chen¹, Takeshi Sano², Hisahiro Sasabe^1,3, Junji Kido^1,2,3 (1.Dept. of Organic Materials Science, Yamagata Univ., 2.Innovation Center of Organic Electronics, Yamagata Univ., 3.Frontier Center for Organic Materials, Yamagata Univ.)

Keywords:organic light-emitting diode, electron-transport materials, electron-injection materials

Conventional electron-injection materials start with Lithium and other alkali metals are widely used in view of lowering operating voltage aiming for high efficiency and stable OLEDs. Recent boom in semi-transparent silver nanoparticle/nanowire electrodes has led to a proliferation of studies around the theme of the development of electron-transport materials (ETMs) showing enhanced electron injection based on the interaction with air-stable silver metal. Herein, we report two 2,6-bis(pyrimidin-2-yl) pyridine derivatives 26DPmPy4bPh and B26DPmPy4Ph as novel ETMs. Notably, for 26DPmPy4bPh, the vacuum level (VL) of ETM was down-shifted for 0.7 eV due to the coordination with the silver. Furthermore, the OLEDs device utilizing a layer-wise fabrication of 26DPmPy4bPh with silver shows a low operating voltage of 2.60 V at 1 cd m^-2 as well as that of (8-Quinolinolato) lithium (Liq).