Journal
APPLIED PHYSICS LETTERS
Volume 103, Issue 9, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4819436
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Funding
- Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST)
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER)
- Ministry of Education, Culture, Sports, Science and Technology of Japan
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The characteristic times and their distributions of a fluorescent 4,4'-bis[(N-carbazole)styryl]biphenyl-based organic light-emitting diode (OLED) were studied using impedance spectroscopy. The four defined characteristic times (transit time, recombination time, trapping time, and ac characteristic time) and their dc bias dependences were obtained from the frequency dependence of capacitance. The trapped carrier density distribution in the time domain was revealed from the voltage dependence of the OLED. The relative value of each characteristic time is suggested to play an important role in determining the profile of the frequency-and voltage-dependent capacitance of OLEDs. (C) 2013 AIP Publishing LLC.
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