Patents by Inventor Stijn Verlaak
Stijn Verlaak has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20210221727Abstract: Disclosed is a cellular glass product having a density D at ambient temperature of at most 200 kg/m3 and a process for the production of a cellular glass product having a density D at ambient temperature of at most 200 kg/m3. The process comprises the steps of: a) contacting glass powder with foaming agent to form a dry mixture, b) thermally treating the mixture in a foaming furnace, thereby forming cellular glass, and c) annealing the cellular glass of step b) in an annealing lehr, wherein the concentration of at least one of the reagents in the dry mixture of step a) that are necessary for enabling the foaming reaction is at least 150% of the concentration corresponding to the theoretical minimum requirement for obtaining the density D.Type: ApplicationFiled: May 15, 2019Publication date: July 22, 2021Inventors: Stijn Verlaak, Barbara Aerts, Christophe Aerts, Vicky Philippe, Gisèle Claes, Damiaan Lemmens
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Patent number: 8247801Abstract: An organic photo-detecting field-effect device is presented, the device comprising a first layer comprising an organic semi-conducting material, the first layer acting as an accumulation layer and as a charge transport layer for a first type of charge carriers, and a second layer comprising a second material, the second layer acting as a an accumulation layer for a second type of charge carriers. Charges collected in the second layer influence the charge transport in the first layer. The second material may be an organic semi-conducting material or a metal. At the interface between the first layer and the second layer a heterojunction is formed in the case of an organic semi-conducting second material, and a Schottky barrier is formed in the case of a metal second material, giving rise to an efficient exciton splitting. Different geometries and operation modes facilitating the removal of the collected photo-generated charge carriers during the reset period of the device are presented.Type: GrantFiled: March 29, 2007Date of Patent: August 21, 2012Assignees: IMEC, Katholieke Universiteit Leuven R&D, K.U. Leuven R&DInventors: Maarten Debucquoy, Stijn Verlaak, Paul Heremans
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Patent number: 7977672Abstract: A two-terminal organic light-emitting device structure is presented with low absorption losses and high current densities. Light generation and emission occur at a predetermined distance from any metallic contact, thereby reducing optical absorption losses. High current densities and thus high emitted light intensity are achieved by combining two types of conduction in one device: by combining space charge limited conduction and field-effect conduction or by combining ohmic conduction and field-effect conduction, thereby optimizing the current densities. This results in a very high local concentration of excitons and therefore a high light intensity, which can be important for applications such as organic lasers, and more in particular electrically pumped organic lasers.Type: GrantFiled: May 27, 2010Date of Patent: July 12, 2011Assignees: IMEC, Katholieke Universiteit LeuvenInventors: Sarah Schols, Stijn Verlaak, Paul Heremans
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Publication number: 20100230668Abstract: A two-terminal organic light-emitting device structure is presented with low absorption losses and high current densities. Light generation and emission occur at a predetermined distance from any metallic contact, thereby reducing optical absorption losses. High current densities and thus high emitted light intensity are achieved by combining two types of conduction in one device: by combining space charge limited conduction and field-effect conduction or by combining ohmic conduction and field-effect conduction, thereby optimizing the current densities. This results in a very high local concentration of excitons and therefore a high light intensity, which can be important for applications such as organic lasers, and more in particular electrically pumped organic lasers.Type: ApplicationFiled: May 27, 2010Publication date: September 16, 2010Applicants: IMEC, KATHOLIEKE UNIVERSITEIT LEUVENInventors: Sarah Schols, Stijn Verlaak, Paul Heremans
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Patent number: 7768019Abstract: A two-terminal organic light-emitting device structure is presented with low absorption losses and high current densities. Light generation and emission occur at a predetermined distance from any metallic contact, thereby reducing optical absorption losses. High current densities and thus high emitted light intensity are achieved by combining two types of conduction in one device: by combining space charge limited conduction and field-effect conduction or by combining ohmic conduction and field-effect conduction, thereby optimizing the current densities. This results in a very high local concentration of excitons and therefore a high light intensity, which can be important for applications such as organic lasers, and more in particular electrically pumped organic lasers.Type: GrantFiled: January 12, 2007Date of Patent: August 3, 2010Assignees: IMEC, Katholieke Universiteit LeuvenInventors: Sarah Schols, Stijn Verlaak, Paul Heremans
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Patent number: 7468328Abstract: The present invention relates to methods for producing a patterned thin film on a substrate. The method comprises the spatially and possibly also temporally modulation of nucleation modes of film growth during the growth of patterned thin films. The nucleation modes are modulated between no or substantially no nucleation, 2D nucleation, and 3D nucleation. The modulation is obtained by adjusting the surface treatment spatially applied over regions of the substrate, the growth conditions for the thin film materials used, and/or the specific thin film materials used. The growth conditions typically comprise the substrate temperature and the deposition flux. The modulation allows for spatially varying the interaction between the substrate material and the thin film materials deposited.Type: GrantFiled: July 6, 2004Date of Patent: December 23, 2008Assignee: Interuniversitair Microelektronica Centrum (IMEC)Inventors: Paul Heremans, Dimitri Janssen, Sören Steudel, Stijn Verlaak
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Publication number: 20080006820Abstract: A two-terminal organic light-emitting device structure is presented with low absorption losses and high current densities. Light generation and emission occur at a predetermined distance from any metallic contact, thereby reducing optical absorption losses. High current densities and thus high emitted light intensity are achieved by combining two types of conduction in one device: by combining space charge limited conduction and field-effect conduction or by combining ohmic conduction and field-effect conduction, thereby optimizing the current densities. This results in a very high local concentration of excitons and therefore a high light intensity, which can be important for applications such as organic lasers, and more in particular electrically pumped organic lasers.Type: ApplicationFiled: January 12, 2007Publication date: January 10, 2008Applicants: INTERUNIVERSITAIR MICROELEKTRONICA CENTRUM (IMEC), KATHOLLIEKE UNIVERSITEIT LEUVENInventors: Sarah Schols, Stijn Verlaak, Paul Heremans
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Publication number: 20070235753Abstract: An organic photo-detecting field-effect device is presented, the device comprising a first layer comprising an organic semi-conducting material, the first layer acting as an accumulation layer and as a charge transport layer for a first type of charge carriers, and a second layer comprising a second material, the second layer acting as a an accumulation layer for a second type of charge carriers. Charges collected in the second layer influence the charge transport in the first layer. The second material may be an organic semi-conducting material or a metal. At the interface between the first layer and the second layer a heterojunction is formed in the case of an organic semi-conducting second material, and a Schottky barrier is formed in the case of a metal second material, giving rise to an efficient exciton splitting. Different geometries and operation modes facilitating the removal of the collected photo-generated charge carriers during the reset period of the device are presented.Type: ApplicationFiled: March 29, 2007Publication date: October 11, 2007Applicant: INTERUNIVERSITAIR MICROELEKTRONICA CENTRUM (IMEC)Inventors: Maarten Debucquoy, Stijn Verlaak, Paul Heremans
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Publication number: 20050014350Abstract: The present invention relates to methods for producing a patterned thin film on a substrate. The method comprises the spatially and possibly also temporally modulation of nucleation modes of film growth during the growth of patterned thin films. The nucleation modes are modulated between no or substantially no nucleation, 2D nucleation, and 3D nucleation. The modulation is obtained by adjusting the surface treatment spatially applied over regions of the substrate, the growth conditions for the thin film materials used, and/or the specific thin film materials used. The growth conditions typically comprise the substrate temperature and the deposition flux. The modulation allows for spatially varying the interaction between the substrate material and the thin film materials deposited.Type: ApplicationFiled: July 6, 2004Publication date: January 20, 2005Applicant: Interuniversitair Microelektronica Centrum (IMEC), a Belgium CorporationInventors: Paul Heremans, Dimitri Janssen, Soren Steudel, Stijn Verlaak