Transparent organic light-emitting diodes consisting of a metal oxide multilayer cathode

Seung Yoon Ryu, Joo Hyon Noh, Byoung Har Hwang, Chang Su Kim, Sung Jin Jo, Jong Tae Kim, Hyeon Seok Hwang, Hong Koo Baik, Hee Seong Jeong, Chang Ho Lee, Seung Yong Song, Seung Ho Choi, Si Young Park

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Abstract

The authors have developed a semitransparent, multilayered cathode of indium tin oxide (ITO)/Ag/tungsten oxide (W O3) for transparent organic light-emitting diodes. The device showed a weak negative differential resistance (NDR), until the operating voltage of 8 V was reached. NDR was due to the resonant tunneling by both the quantum barrier and quantum well. The silver oxide (Ag2 O) on the Ag metal was confirmed by x-ray photoelectron spectroscopy, and the energy levels of Ag2 O were quantized due to the quantum size effect and this produced the resonant tunneling channels. The device using ITOAgW O3 with a LiFAl bilayer was superior to those devices which only used ITO or W O3, mainly because the out coupling was enhanced by employing a W O3 material, which is much more transparent than ITO.

Original languageEnglish
Article number023306
JournalApplied Physics Letters
Volume92
Issue number2
DOIs
Publication statusPublished - 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Ryu, S. Y., Noh, J. H., Hwang, B. H., Kim, C. S., Jo, S. J., Kim, J. T., Hwang, H. S., Baik, H. K., Jeong, H. S., Lee, C. H., Song, S. Y., Choi, S. H., & Park, S. Y. (2008). Transparent organic light-emitting diodes consisting of a metal oxide multilayer cathode. Applied Physics Letters, 92(2), [023306]. https://doi.org/10.1063/1.2835044