Organic light emitting devices (OLEDs) have shown promise for application in energy efficient general lighting. Low cost, long-lived white OLEDs with high power efficiencies are essential for the widespread adaption of organic solid state lighting technology. For white light applications, several routes have been demonstrated for OLEDs. Regardless of the method used, the efficiency of the blue component limits the overall efficiency of the device. Our work, therefore, focuses on using chemical intuition and computational methods to develop transport, emitter, and blocking materials for high efficiency blue OLEDs, along with device architectures to take advantage of these new materials. Through this chemical modification of materials we were able to influence both the charge balance and emission efficiency of OLEDs, and understand the influence of the location of photon emission in OLEDs as a function of minor chemical modifications of host and electron transport materials. Design rules, structure-property relationships and results from state of the art OLEDs will be presented.

Optimization of OLED power efficiency by chemical structure modification

240th National Meeting (2010)

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