Small Signal Impedance and Optical Modulation Bandwidth Characterization and Modeling of Organic Light Emitting Devices


Abstract (Summary)
In this thesis work we concentrated mainly on understanding the carrier mobilities of organic light emitting devices. We were able to obtain the mobilities of the charge carriers using a novel small signal optical bandwidth modulation method. We then compared the electron mobilities obtained using this method to the conventional electroluminescent time delay method and found a good agreement. All the measurements were done for organic light emitting devices of two different Alq3 (emitting layer) thicknesses. Admittance spectroscopy technique was used to obtain the hole mobilities of the organic light emitting devices. A two carrier device was modeled in the low frequency region and was able to achieve the hole mobilities of the organic light emitting device. By this work we were able to obtain the mobilities of electrons and holes using different techniques with a simultaneous measurement and achieved understanding of the dynamics of the charge carriers.
Bibliographical Information:


School:University of Cincinnati

School Location:USA - Ohio

Source Type:Master's Thesis

Keywords:organic light emitting devices mobilities of charge carriers admittance spectroscopy


Date of Publication:01/01/2008

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