“Scientists at the U.S. Department of Energy's Ames Laboratory, in collaboration with scientists at the University of Michigan, Ann Arbor, have developed and demonstrated a novel, fluorescence-based chemical sensor that is more compact, versatile and less expensive than existing technology of its kind. The new sensor holds promise for myriad potential applications, such as monitoring oxygen, inorganic gases, volatile organic compounds, biochemical compounds, and biological organisms.”(Johnston).
Ames Laboratory has been a driving force in OLED research and finally produced an effective model. Generally, OLEDs have a layer of organic materials placed between an anode and cathode, all deposited on a substrate. In the organic layer there is an emissive layer, which emits electrons easily, and a conductive layer, which has electrons removed. OLEDs operate through electrophosphorescence and thus have a similar process to what we covered; a voltage excites a species, which transfers to a different spin orbital and then drops to ground state to emit a photon.
First, a voltage is applied across the OLED causing a current of electrons to flow from cathode to anode and through the organic layer. The cathode gives electrons to the emissive layer of organic molecules. The anode removes electrons from the conductive layer of organic molecules, which creates “holes” or gaps. At the boundary between the emissive and the conductive layers, electrons find the “holes”. Electrons fill the holes by falling into a different spin state, matching the atom that's missing an electron. The electron then...
... middle of paper ...
.... Optical Sensors and Multisensor Arrays Containing Thin Film Electroluminescent Devices. Iowa State University Research Foundation, Inc., assignee. Patent US 6,331,438 B1. 18 Dec. 2001. Print.
Freudenrich, Craig. "HowStuffWorks "How OLEDs Work"" HowStuffWorks "Electronics" How Stuff Works. Web. 28 Nov. 2011.
"Future Technologies." Michigan State University. Est. 1855. East Lansing, Michigan USA. Michigan State University. Web. 27 Nov. 2011.
Johnston, Saren. "New Standard in Sensor Technology." EurekAlert! - Science News. Ames Laboratory. Web. 29 Nov. 2011.
"Low Cost OLED Sensors for 24/7 Protection." Ameslab.gov. Iowa State University. Web. 27 Nov. 2011.
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