ECE
ECE
ECE ECE


Defense Event

Charge and Exciton Dynamics in Organic Optoelectronic Devices

Caleb Coburn


PhD Candidate
University of Michigan Physics Department
 
Friday, April 19, 2019
3:00pm - 4:00pm
1571 GGB

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About the Event

Organic optoelectronics use carbon based molecules to interface between light and electrical signals. The operation of these devices is determined by the dynamic behaviors of their charges and excited states. For example, organic light emitting diodes use injected electrical charges to form excited states that, in turn, emit light. Organic photovoltaics and photodetectors operate by the reverse process. Understanding the dynamics of charges and excited states is crucial to designing high performance devices. The fi rst part of this thesis focuses on understanding charge and exciton dynamics in organic light emitting devices. First, charge balance and exciton con nement are studied using sensitizer methods and analytical modeling. The impact of changes in charge balance and exciton con nement on the lifetime of blue phosphorescent organic light emitting diodes is investigated. The understanding gained in these studies is then applied to the design of a highly reliable stacked white-emitting device for solid state lighting. The second part focuses on charge di usion in organic heterostructures. Because of the low charge mobilities of organic semiconductors, organic devices are typically thin with negligible lateral charge transport. We show that charge can be transported laterally across centimeters in certain organic heterostructures and explain the properties of the heterostruture that give rise to this phenomena. Lateral transport heterostructures are then used to develop the rst organic charge coupled devices.

Additional Information

Contact: Eva Ruff

Phone: 734-764-1533

Email: emruff@umich.edu

Sponsor(s): OCM Group

Faculty Sponsor: Stephen Forrest

Open to: Public