Skip to main content Accessibility help
×
Home

Improved Light Outcoupling from OLED by Non-Wave-Guiding Anode Designs

  • M. Slawinski (a1), M. Brast (a1), X. D. Zhang (a1), F. Merget (a2), J. Witzens (a2), M. Heuken (a1) (a3), A. Vescan (a1) and H. Kalisch (a1)...

Abstract

We improve the efficiency of a bottom-emitting red phosphorescent organic light emitting diode (OLED) by the suppression of wave-guided modes in the bottom contact. ITO as bottom contact layer has been substituted by a thin Ti/Au layer. Electromagnetic simulation results of both devices predict the absence of TE polarized guided contact modes by the use of 10 nm Au as bottom electrode. We measured an improved outcoupling of light which overcompensates absorption losses of the Ti/Au layer in the measured emission cone. By the use of 1 nm Ti as undercoat, a continuous Au film of 8 nm thickness could be realized with an improved transmittance for long wavelengths (λ > 550 nm). As a consequence of fewer lateral guided modes, the external quantum efficiency (EQE) has been enhanced from 11.5 % of the standard device to 14 % of the device with the Ti/Au electrode.

Copyright

References

Hide All
1. Adachi, Chihaya, et al. ., Journal of Applied Physics 90.10 (2001): 50485051.
2. Park, Min Su, and Lee, Jun Yeob, Chemistry of Materials 23.19 (2011): 43384343.
3. Wei, Mao-Kuo, and Su, I-Lin. Optics express 12.23 (2004): 57775782.
4. Sun, Yiru, and Forrest, Stephen R.. Nature Photonics 2.8 (2008): 483487.
5. Tassin, P. et al. ., Nature Photonics 6 (2012): 259264.
6. Economou, E. N. (2010), Green’s Functions in Qunatum Physics, 3 rd ed., Berlin, Germany: Springer
7. Materials Database ANSYS RSOFT (2012).
8. Lindla, Florian et al. . Applied Physics Letters 95 (2009): 213305.
9. Merck OLED Materials, Frankfurt a. M. Germany.

Keywords

Related content

Powered by UNSILO

Improved Light Outcoupling from OLED by Non-Wave-Guiding Anode Designs

  • M. Slawinski (a1), M. Brast (a1), X. D. Zhang (a1), F. Merget (a2), J. Witzens (a2), M. Heuken (a1) (a3), A. Vescan (a1) and H. Kalisch (a1)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.