Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 62: [DS] Organic Electronics and Photovoltaics I (jointly with CPP, HL, and O)

O 62.6: Vortrag

Donnerstag, 17. März 2011, 11:30–11:45, GER 38

Photoinduced degradation process of Fir6 emitter molecules: a laser desorption/ionization time-of-flight mass spectrometry investigation — •Ines Rabelo de Moraes¹, Ruben Seifert^1,2, Sebastian Scholz^1,3, Björn Lüssem¹, and Karl Leo¹ — ¹Institut für Angewandte Photophysik, Technische Universität Dresden, George-Bähr-Str. 1, 01062 Dresden, Germany — ²Von Ardenne Anlagentechnik GmbH, Plattleite 19/29, 01324 Dresden, Germany — ³Fraunhofer-Institut für Keramische Technologien und Systeme, Winterbergstraße 28, 01277 Dresden, Germany

Phosphorescent Organic Light Emitting diodes (OLEDs) have attracted much interest for their potential application in the field of full color displays and as next generation of lighting sources. One of the major problems related to the OLED technology is the short lifetime of the blue phosphorescent emitters. For improving the lifetime of the OLEDs a deep understanding of the intrinsic chemical degradation is required. Our work is focused on the photoinduced degradation process of single layer of the Fir6 molecule used as blue phosphorescent emitter by laser desorption/ionization time-of-flight mass spectrometry (LDI-TOF-MS). The LDI-TOF spectra collected at the laser intensity of 114 μJ/pulse indicate that the Fir6 molecule dissociates into [Ir(F2ppy)2]+ and [Fir6-(pyrazole)1]+. The reaction between the Fir6 fragments and the Fir6 molecule itself resulting in the formation of [Fir6+(pyrazole)1]+, and [Fir6-(pyrazole)1+Ir(F2ppy)2]+ could be observed as well. Additionally, the degradation processes of full processed OLEDs based on Fir6 emitter will be presented.