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8 October 2005 Novel deep-blue emitting phosphorescent emitter
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Currently, one of the most challenging applications for OLEDs is the full color display. The most energy-efficient way to realize light generation in OLEDs is by using phosphorescent emitters. Green and red emitters have already been demonstrated, but the search for blue emitting organic phosphorescent emitters with good color purity is still ongoing with arduous effort. Here we present our work with a new material developed at BASF which allows phosphorescent emission in the deep-blue spectral range. The emitter has an emission maximum at 400 nm, which gives CIE color coordinates of x = 0.16 and y = 0.06. An OLED device made with this new material shows a maximum external quantum efficiency of 1.5 %. The OLED was built in a three layer structure, with the emitting zone being a hybrid guest-host system. As host material we used the optically and electronically inert polymer poly-methyl-methacrylate (PMMA). Because of its lack of charge transport abilities we doped the host material with a high concentration of the triplet emitting material, i.e. the emitter itself is also used as charge transport material.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
C. Schildknecht, G. Ginev, A. Kammoun, T. Riedl, W. Kowalsky, H.-H. Johannes, C. Lennartz, K. Kahle, M. Egen, T. Geßner, M. Bold, S. Nord, and P. Erk "Novel deep-blue emitting phosphorescent emitter", Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 59370E (8 October 2005);

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