Stephen J Forrest

US Patent:

6403392, Jun 11, 2002

Filed:

Nov 28, 2000

Appl. No.:

09/723287

Inventors:

Paul E. Burrows - Princeton Junction NJ
Stephen R. Forrest - Princeton NJ
Vladimir Bulovic - Metuchen NJ
Peifang Tian - Princeton NJ
Julie Brown - Princeton NJ

Assignee:

The Trustees of Princeton University - Princeton NJ

International Classification:

H01L 2100

US Classification:

438 22, 438 35, 438 79, 438743

Abstract:

A method of fabricating a device is provided. A shadow mask is positioned in a first position over a substrate. A first process is performed on the substrate through the shadow mask. After the first process is performed, the shadow mask is moved to a second position over the substrate, measured relative to the first position. After the shadow mask is moved to the second position, a second process is performed on the substrate through the shadow mask.

US Patent:

6458475, Oct 1, 2002

Filed:

Nov 24, 1999

Appl. No.:

09/449363

Inventors:

Chihaya Adachi - East Windsor NJ
Stephen R. Forrest - Princeton NJ

Assignee:

The Trustee of Princeton University - Princeton NJ

International Classification:

H05B 3314

US Classification:

428690, 428917, 313504, 313506

Abstract:

Improved electroluminescent efficiency in organic light emitting diodes is obtained with an emitter layer comprising organic complexes of transition metals with benzoxazole derivatives. A dimethylated benzoxazole derivative with zinc shows blue fluorescence and phosphorescence.

US Patent:

6573651, Jun 3, 2003

Filed:

Dec 18, 2000

Appl. No.:

09/740183

Inventors:

Chihaya Adachi - East Windsor NJ
Marc A. Baldo - Princeton NJ
Stephen R. Forrest - Princeton NJ

Assignee:

The Trustees of Princeton University - Princeton NJ

International Classification:

H01J 162

US Classification:

313504, 428690, 257 40, 3151691

Abstract:

The present invention is directed to simplified OLED structures comprising an anode layer, a hole injecting layer (HIL) in direct contact with the anode layer, an emissive organic electron transporting layer (ETL) in direct contact with the hole injecting layer, and a cathode layer in direct contact with the emissive organic electron transporting layer. The hole injecting material used in the hole injecting layer is characterized, in particular, as being an organic material having an ionization potential that is not more than about 0. 7 eV greater than the ionization potential of the material used for the anode layer. The emissive organic electron transporting layer comprises an organic electron transporting material and an organic hole-trapping emissive material, for example, an organic phosphorescent material that produces emission from a triplet excited state of an organic molecule.

US Patent:

6645645, Nov 11, 2003

Filed:

Aug 1, 2000

Appl. No.:

09/629335

Inventors:

Chihaya Adachi - East Windsor NJ
Marc A. Baldo - Princeton NJ
Stephen R. Forrest - Princeton NJ

Assignee:

The Trustees of Princeton University - Princeton NJ

International Classification:

H05B 3314

US Classification:

428690, 428917, 313504, 313506, 257102, 257103

Abstract:

An organic light emitting device structure having an organic light emitting device (OLED) over a substrate, where the OLED has, for example, an anode, a hole transporting layer (HTL), a first electron transporting layer (ETL) that is doped with a phosphorescent material, a second electron transporting layer (ETL), and a cathode. The OLEDs of the present invention are directed, in particular, to devices that include an emissive layer comprised of an electron transporting host material having a triplet excited state energy level that is higher than the emissive triplet excited state energy level of the phosphorescent dopant material.

US Patent:

6900588, May 31, 2005

Filed:

May 30, 2003

Appl. No.:

10/452659

Inventors:

Chihaya Adachi - East Windsor NJ, US
Marc A. Baldo - Princeton NJ, US
Stephen R. Forrest - Princeton NJ, US

Assignee:

The Trustees of Princeton University - Princeton NJ

International Classification:

H01J001/62

US Classification:

313504, 313506

Abstract:

The present invention is directed to simplified OLED structures comprising an anode layer, a hole injecting layer (HIL) in direct contact with the anode layer, an emissive organic electron transporting layer (ETL) in direct contact with the hole injecting layer, and a cathode layer in direct contact with the emissive organic electron transporting layer. The hole injecting material used in the hole injecting layer is characterized, in particular, as being an organic material having an ionization potential that is not more than about 0. 7 eV greater than the ionization potential of the material used for the anode layer. The emissive organic electron transporting layer comprises an organic electron transporting material and an organic hole-trapping emissive material, for example, an organic phosphorescent material that produces emission from a triplet excited state of an organic molecule.

US Patent:

7053412, May 30, 2006

Filed:

Jun 27, 2003

Appl. No.:

10/607138

Inventors:

Michael Hack - Lambertville NJ, US
Stephen R. Forrest - Princeton NJ, US
Jiangeng Xue - Piscataway NJ, US

Assignee:

The Trustees of Princeton University and Universal Display Corporation - Ewing NJ

International Classification:

H01L 21/00

US Classification:

257 79, 257 80

Abstract:

A light emitting device capable of displaying grey scale is provided. The device has a pixel having a plurality of bistable subpixels. Each subpixel has an ON state and an OFF state. A different power line is coupled to each bistable subpixel. Circuitry that can individually modulate the pulse width of a power signal transmitted through each power line is connected to the power lines. Each subpixel includes a first light emitting device the emits light when the subpixel is in the ON state. Each subpixel has substantially the same size and emits substantially the same spectrum of light in the ON state.

US Patent:

7230963, Jun 12, 2007

Filed:

Apr 14, 2005

Appl. No.:

11/108039

Inventors:

Vinod M. Menon - Lawrenceville NJ, US
Shubhashish R. Datta - New Haven CT, US
Stephen R. Forrest - Princeton NJ, US

Assignee:

The Trustees of Princeton University - Princeton NJ

International Classification:

H01S 5/00

US Classification:

372 5021, 372 501, 356478

Abstract:

A monolithic wavelength stabilized system comprises a laser monolithically formed with a waveguide splitter having at least two branches. Non-identical resonators having different wavelengths are operatively coupled to each branch of the splitter and a photodiode is communicatively coupled to receive the output from each non-identical resonator. A control unit receives the photocurrent outputs from the photodiodes, determines based on the photocurrents whether the wavelength of the laser signal is at a desired value, and transmits a feedback signal to the laser to move the laser output toward the desired wavelength. The laser, splitter, resonators, and photodiodes are monolithically formed in a single chip using asymmetric waveguides.

US Patent:

7333689, Feb 19, 2008

Filed:

Sep 30, 2005

Appl. No.:

11/241003

Inventors:

Vinod M. Menon - Lawrenceville NJ, US
Milind R. Gokhale - Princeton NJ, US
Stephen R. Forrest - Princeton NJ, US
Yu Huang - Princeton NJ, US
Fengnian Xia - Plainsboro NJ, US

Assignee:

The Trustees of Princeton University - Princeton NJ

International Classification:

G02B 6/26
G02B 6/10

US Classification:

385 28, 385 50, 385131

Abstract:

An asymmetric twin waveguide (ATG) structure with quantum-well intermixing in the taper region of the active waveguide is disclosed. The structure comprises a first waveguide, a second waveguide, and a taper formed in the second waveguide. The taper has an intermixed area formed therein comprising a plurality of quantum wells intermixed with a plurality of barriers. The quantum wells and barriers may be intermixed using plasma-enhanced intermixing such as, for example, Argon plasma enhanced intermixing. Quantum-well intermixing reduces absorption loss normally encountered in the movement of light between waveguides.