Dresden 2009 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 44: Organic semiconductors I
HL 44.6: Talk
Thursday, March 26, 2009, 12:15–12:30, POT 51
Degradation of phosphorescent blue organic light-emitting diodes — •Chien-Shu Chiu1,3, Frank Steinbacher2,3, 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.