基于新型共基质电子传输层的有机发光器件

Organic LED Based on a Novel Cohost Electron Transport Layer

研究了Liq:Bphen混合层的电子传输特性。采用该混合层作为共基质电子传输层制备了结构为[ITO/m-MTDATA/NPB/Alq3/Liq(33%)∶Bphen/LiF/Al]的有机发光器件,基于共基质电子传输层的器件驱动电压比传统器件降低了13%而效率却提高了21%。研究表明通过优化混合层的掺杂浓度,可以显著提高电子传输层的导电率,降低驱动电压,从而提高器件的效率。

Efficient electron transport in organic light-emitting diodes （OLEDs） was demonstrated. Using an electron-transport layer composed of 4,7-diphenyl-1,10-phenanthmline （Bphen） with 8-hydroxyquinolinato lithium （Liq） co-deposited layer, low-voltage driving OLEDs with the structure of [ITO/mMTDATA/NPB/Alq3/Liq （33%） ：Bphen/LiF/Al] was achieved. It is found that the efficiency is enhanced by 21% while driving voltage is reduced by 13 % as compared to the control device. Therefore this strategy with the judicial doping concentration of Liq greatly increases the electron conductivity in ETL, leading to the lowering the operating voltage and enhancing the power efficiency of the OLEDs.