Tuning Energy Levels of Electron-Transport Materials by Nitrogen Orientation for Electrophosphorescent Devices with an 'Ideal' Operating Voltage
Tuning Energy Levels of Electron-Transport Materials by Nitrogen Orientation for Electrophosphorescent Devices with an 'Ideal' Operating Voltage
复制标题
DOI：
10.1002/adma.200904249
复制
发表时间：
2010-08-10
影响因子：
29.4
通讯作者：
Kido, Junji
中科院分区：
文献类型：
--
作者：
Su, Shi-Jian;Sasabe, Hisahiro;Kido, Junji
报道了一系列含1，3，5-三嗪核的电子传输材料（ETM）作为未掺杂的电子传输层（ETL），其能级可以通过在分子外围引入吡啶环以及氮的取向来调节。在100 cd m（-2）下，基于面-三（2-苯基吡啶）铱（Ir（PPy）3）的绿色磷光OLED的发光效率没有降低，其工作电压为2.42 V，对应于发光光子能量（hv）。此外，电致发光的阈值电压甚至可以比hv/e的最小值低0.1至0.2V。
A series of 1,3,5-triazine-core-containing electron-transport materials (ETMs) are reported as an undoped electron-transport layer (ETL), whose energy levels can be tuned by introducing pyridine rings on the periphery of the molecule and also orientation of nitrogen. An unprecedented low operating voltage of 2.42 V, corresponding to the emitting photon energy (hv), was achieved for the fac-tris(2-phenylpyridine) iridium (Ir(PPy)3) based green phosphorescent OLEDs at 100 cd m(-2) without consumption of their efficiency. Moreover, the threshold voltage for electroluminescence can be even 0.1 similar to 0.2 V lower than the minimum value of hv/e.