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8 October 2014 Degradation of blue phosphorescent organic LEDs analyzed by solution NMR spectroscopy
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In organic light-emitting diodes (OLEDs), device degradation is one of the crucial problems to be solved. In this study, we have investigated material degradations in FIrpic-based phosphorescent OLEDs by solution nuclear magnetic resonance (NMR) spectroscopy. NMR experiments clearly indicate that about 18% of TPhDB molecules, which is used as an electron-transporting material, are decomposed during driving the devices. The decomposition of the TPhDB molecules is considered to be related to the device degradation. This study demonstrates that solution NMR spectroscopy is a useful tool to investigate an origin of device degradation of multi-layered OLEDs in terms of decomposition of organic molecules.
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Tatsuya Fukushima, Hajime Suzuki, Hiroto Ito, Shinya Ootsu, Kunimasa Hiyama, Hiroshi Kita, and Hironori Kaji "Degradation of blue phosphorescent organic LEDs analyzed by solution NMR spectroscopy", Proc. SPIE 9183, Organic Light Emitting Materials and Devices XVIII, 91830H (8 October 2014);

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