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27 August 2009 Transient emission in OLEDs: implications for sensing applications
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Typical guest-host small molecular OLEDs (SMOLEDs) exhibit an emission spike at 100 - 200 ns and a tail that extends over several μs following a bias pulse. The spike and tail are attributed to recombination of correlated charge pairs and detrapped charges (mostly from the host shallow states), respectively. They may also be associated with other OLED layers and other phenomena, e.g., triplet-triplet annihilation. The implications of the spike and tail for OLED-based, photoluminescent oxygen sensors operated in the time domain are evaluated and compared to the behavior observed when using undoped OLEDs or inorganic LEDs as the excitation sources.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Rui Liu, Zhengqing Gan, Yuankun Cai, Alex Smith, Joseph Shinar, and Ruth Shinar "Transient emission in OLEDs: implications for sensing applications", Proc. SPIE 7418, Organic Semiconductors in Sensors and Bioelectronics II, 74180D (27 August 2009);

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