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Patent highlights

22 Jul 2003

The pick of this week’s patent applications including a way to make efficient white-light emitting OLEDs.

•  Title: White light emitting OLEDs from combined monomer and aggregate emission
Applicant: The Trustees of Princeton University and The University of Southern California, US
International application number: WO 03/059015
Two US universities are trying to patent a method to produce efficient white-emitting organic light emitting devices (WOLEDs). “White emission is achieved from two emitters in a single emissive region through the formation of an aggregate by one of the emissive centers,” say the application’s authors. They also claim their WOLEDs are simple to make, bright, efficient and exhibit a high color-rendering index.

•  Title: Multiple wavelength laser source
Applicant: Raicol Crystals Ltd, Israel
International application number: WO 03/058337
Patent application WO 03/058337 describes a multi-wavelength light source (MWS) that simultaneously emits at different wavelengths. The MWS contains a laser that provides a fundamental frequency and a periodically poled optical element that consists of a number of gratings. “Each grating generates output laser light beams that have wavelengths that are a function of the first frequency and the polling period of the grating,” state the authors.

•  Title: Method and device for determining concentrations of oil in water
Applicant: ABB Research Ltd, Switzerland
International application number: WO 03/058219
A method to determine the concentration of oil in underwater separation tanks used in offshore crude oil extraction is the subject of patent application WO 03/058219. A fiber-optic cable carries light from a vessel on the water’s surface to a measuring cell in the separation tank, which sits on the ocean floor. Raman scattered light is then collected by a second fiber-optic cable, which guides it back to the vessel for processing. “The intensity of the Raman spectral line is correlated with the concentration of oil in the water,” explain the authors.

•  Title: Energy sensing light emitting diode display
Applicant: Intel Corporation, US
International application number: WO 03/058588
Intel is trying to patent an OLED that can operate as both a light emitter and an energy detector. In the first mode, the OLED emits light via electroluminescence. In the second mode, the OLED converts incoming photons into an electrical signal by the photoelectric effect. Such an OLED can display an image and calculate the amount on light falling on it at the same time. “A display including OLEDs can also detect light energy generated by the display itself,” says Intel in its application.

Jacqueline Hewett is news reporter on Optics.org and Opto & Laser Europe magazine.

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