Abstract
We investigate a set of transparent organic LEDs (TOLEDs) with different organic capping layer (OC) thicknesses to understand the capping layer effect. We find that thickness variation of the OC strongly influences the emission properties of TOLEDs and exhibits different trends for top or bottom emission. The external quantum efficiency for the top side can be enhanced by a factor of 63%, but that of the bottom side only by 4% compared to a reference device without an OC. Additionally, we demonstrate that the introduction of the OC is an effective method to control the bottom-to-top emission ratio within a measured range from 2.87 to 6.05.
© 2011 Optical Society of America
Full Article | PDF ArticleMore Like This
Jonghee Lee, Simone Hofmann, Michael Thomschke, Mauro Furno, Yong Hyun Kim, Björn Lüssem, and Karl Leo
Opt. Lett. 36(15) 2931-2933 (2011)
Jonghee Lee, Simone Hofmann, Mauro Furno, Yong Hyun Kim, Jeong-Ik Lee, Hye Yong Chu, Björn Lüssem, and Karl Leo
Opt. Lett. 37(11) 2007-2009 (2012)
Simone Hofmann, Michael Thomschke, Björn Lüssem, and Karl Leo
Opt. Express 19(S6) A1250-A1264 (2011)