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HL: Fachverband Halbleiterphysik

HL 44: Organic semiconductors I

HL 44.6: Vortrag

Donnerstag, 26. März 2009, 12:15–12:30, POT 51

Degradation of phosphorescent blue organic light-emitting diodes — •Chien-Shu Chiu^1,3, Frank Steinbacher^2,3, Ralf Krause³, Arvid Hunze³, and Wolfgang Kowalsky¹ — ¹Department of Electrical Engineering & Information Technology, Technical University of Braunschweig, Germany — ²Department of Materials Science VI, University of Erlangen-Nuremberg, Germany — ³Siemens AG, CT MM 1, Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany

Development of phosphorescent materials has significantly improved the efficiency of organic light-emitting diodes (OLEDs). By using efficient red, green and blue phosphorescent emitter materials high efficient white OLEDs can be achieved. However, due to low stability of blue phosphorescent materials the lifetime of phosphorescent white OLEDs remains an issue. As a result, degradation of blue phosphorescent materials needs to be further investigated and improved.

In this work, blue OLED devices based on the phosphorescent emitter FIrpic were investigated. Single-carrier hole-only as well as electron-only devices were fabricated. For investigation of degradation process the devices were stressed with electrical current and UV-light to study the impact of charge carriers as well as excitons and exciton-polaron quenching on the stability of the blue dye.