Effect of Li2O/Al cathode in Alq3 based organic light-emitting diodes

Eun Chul Shin, Hui Chul Ahn, Wone Keun Han, Tae Wan Kim, Won Jae Lee, Jin Woong Hong, Dong Hoe Chung, Min Jong Song
Journal of Nanoscience and Nanotechnology 2008, 8 (9): 4684-7
An effect of bilayer cathode Li20/Al was studied in Alq3 based organic light-emitting diodes with a variation of Li2O layer thickness. The current-luminance-voltage characteristics of ITO/TPD/Alq3/Li2O/Al device were measured at ambient condition to investigate the effect of Li2O/Al. It was found that when the thickness of Li2O layer is in the range of 0.5-1 nm, there are improvements in luminance, efficiency, and turn-on voltage of the device. A current density and a luminance are increased by about 100 times, a turn-on voltage is lowered from 6 V to 3 V, a maximum current efficiency is improved by a factor of 2.3, and a maximum power efficiency is improved by a factor of 3.2 for a device with a use of thin Li2O layer compared to those of the one without the Li2Otron-barrier height for electron injection from the cathode to the emissive layer.

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