Ralph A Young

US Patent:

6565996, May 20, 2003

Filed:

Jun 6, 2001

Appl. No.:

09/875646

Inventors:

Tukaram K. Hatwar - Penfield NY
Ralph H. Young - Rochester NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

H05B 3314

US Classification:

428690, 428917, 313502, 313504, 313506, 257101

Abstract:

Disclosed are organic electroluminescent devices comprising a substrate, an anode and a cathode disposed over the substrate, an emission layer (EML) disposed between the anode and the cathode, a hole-transport layer (HTL) disposed between the anode and the emission layer, and an electron-transport layer (ETL) disposed between the cathode and the emission layer. A sublayer of the HTL, the ETL, or both the HTL and the ETL comprises a derivative of anthracene as a color-neutral dopant, the sublayer being adjacent to the EML. A color-neutral dopant is a dopant whose presence does not alter the electroluminescent color of the device.

US Patent:

6692846, Feb 17, 2004

Filed:

Jun 20, 2002

Appl. No.:

10/176026

Inventors:

Tukaram K. Hatwar - Penfield NY
Ralph H. Young - Rochester NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

H05B 3314

US Classification:

428690, 428917, 313504, 313506, 257 40, 257102

Abstract:

An organic electroluminescent device includes a substrate; an anode and a cathode positioned relative to the substrate; an emission layer disposed between the anode and the cathode; a hole-transport layer disposed between the anode and the emission layer; and an electron-transport layer disposed between the cathode and the emission layer. The hole-transport layer includes two or more sublayers, one sublayer containing a stabilizing dopant, and the sublayer adjacent to the emission layer containing no stabilizing dopant. Alternatively or in addition, the electron-transport layer includes two or more sublayers, one sublayer containing a stabilizing dopant, and the sublayer adjacent to the emission layer containing no stabilizing dopant. The stabilizing dopant includes rubrene or derivatives thereof.

US Patent:

6720090, Apr 13, 2004

Filed:

Jan 2, 2001

Appl. No.:

09/753091

Inventors:

Ralph H. Young - Rochester NY
Jianmin Shi - Webster NY
Ching W. Tang - Rochester NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

H05B 3314

US Classification:

428690, 428917, 428704, 313504, 313506, 25230116, 25230126, 257 40, 257103

Abstract:

An organic light emitting device includes a substrate, an anode and a cathode disposed over the substrate; a luminescent layer disposed between the anode and the cathode wherein the luminescent layer includes a host and at least one dopant; the host of the luminescent layer being selected to include a solid organic material comprising a mixture of at least two components wherein the first component of the mixture is an organic compound that is capable of transporting both electrons and holes and that is substantially non-polar; and the second component of the mixture is an organic compound that is more polar than the first component; and the dopant of the luminescent layer being selected to produce light from the light emitting device.

US Patent:

6727644, Apr 27, 2004

Filed:

Aug 6, 2001

Appl. No.:

09/923024

Inventors:

Tukaram K. Hatwar - Penfield NY
Ralph H. Young - Rochester NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

H01J 162

US Classification:

313504, 313506

Abstract:

Disclosed are organic electroluminescent devices comprising a substrate, an anode and a cathode disposed over the substrate, an emission layer (EML) disposed between the anode and the cathode, a hole-transport layer (HTL) disposed between the anode and the emission layer, and an electron-transport layer (ETL) disposed between the cathode and the emission layer. The EML and either the HTL, the ETL, or both the HTL and the ETL include a derivative of anthracene as a color-neutral dopant. A color-neutral dopant is a dopant whose presence does not alter the electroluminescent color of the device.

US Patent:

6875524, Apr 5, 2005

Filed:

Aug 20, 2003

Appl. No.:

10/644245

Inventors:

Tukaram K. Hatwar - Penfield NY, US
Ralph H. Young - Rochester NY, US
Christopher T. Brown - Rochester NY, US

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

H05B033/14

US Classification:

428690, 428917, 257 88, 257 98, 313504, 313506

Abstract:

Organic light-emitting diodes (OLEDs) that produce white light include an anode, a hole-transporting layer disposed over the anode, a blue light-emitting layer disposed over the hole-transporting layer, an electron-transporting layer disposed over the blue light-emitting layer, and a cathode disposed over the electron-transporting layer. The hole-transporting layer is doped with both a yellow-emitting and a red-emitting dopant. When used together with red, green, and blue color filters, the OLEDs produce red, green, and blue light with good color quality and high efficiency. Also disclosed are multicolor display devices utilizing the OLEDs together with color filters or together with both color filters and liquid-crystal light valves.

US Patent:

7079091, Jul 18, 2006

Filed:

Jan 14, 2003

Appl. No.:

10/341944

Inventors:

Denis Y. Kondakov - Kendall NY, US
James R. Milch - Penfield NY, US
Ralph H. Young - Rochester NY, US
James R. Sandifer - Rochester NY, US

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G09G 3/30

US Classification:

345 76, 345 82, 345214

Abstract:

A method of adjusting the voltage applied across the pixels of an OLED display to compensate for aging including measuring the accumulation of trapped positive charge to produce a signal representative of such accumulation, and responding to such signal to adjust the voltages applied across the pixels of the OLED to compensate for aging.

US Patent:

7084425, Aug 1, 2006

Filed:

Dec 5, 2003

Appl. No.:

10/729208

Inventors:

Marina E. Kondakova - Kendall NY, US
Ralph H. Young - Rochester NY, US

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

H01L 35/24

US Classification:

257 40

Abstract:

Disclosed is an electroluminescent device comprising a cathode and an anode; and, located therebetween, a light-emitting layer (LEL) comprising a phosphorescent green-light-emitting material and a host material for the light-emitting material, and in a layer adjacent to the LEL on the anode side, an exciton-blocking layer containing a compound having a hole mobility of at least 1×10cmVsand a triplet energy exceeding that of the green-light-emitting material of the LEL. Such a device provides useful light emission.

US Patent:

7288330, Oct 30, 2007

Filed:

Jul 1, 2004

Appl. No.:

10/882834

Inventors:

Tukaram K. Hatwar - Penfield NY, US
Jeffrey P. Spindler - Rochester NY, US
Ralph H. Young - Rochester NY, US

Assignee:

Eaastman Kodak Company - Rochester NY

International Classification:

H01L 51/50

US Classification:

428690, 428917, 313504, 313506

Abstract:

A broadband-emitting OLED device having an anode and a cathode spaced from the anode includes a first light-emitting layer provided over the anode and containing a first host material and a first light-emitting material, wherein the first host material is a mixture of one or more mono-anthracene derivatives and one or more aromatic amine derivatives, wherein the mono-anthracene derivative(s) being provided in a volume fraction range of 5% to 50% relative to the total host volume, and the aromatic amine derivative(s) being provided in a volume fraction range of 50% to 95% relative to the total host volume, and a second light-emitting layer provided over or under the first light-emitting layer.