BLUE PHOSPHORS FOR FULL-COLOR HIGH-DEFINITION VIDEO DISPLAY

Award Information
Agency: National Science Foundation
Branch: N/A
Contract: N/A
Agency Tracking Number: 11863
Amount: $249,988.00
Phase: Phase II
Program: SBIR
Awards Year: 1992
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Patriots Park, Bedford, MA, 01730
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Nasser Karam
 Senior Staff Scientist
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
THIN-FILM ELECTROLUMINESCENT TECHNOLOGY NOW PRODUCES MATRIX-ADDRESSED SELF-LUMINOUS FLAT PANELS WHICH COME VERY CLOSE TO PROVIDING THE CAPABILITY FOR HIGH-DEFINITION COLOR TELEVISION. THE PRINCIPAL OBSTACLE TO ADVANCING THIS TECHNOLOGY TO FULL-COLOR VIDEO IMAGING IS THE NEED FOR A HIGH-BRIGHTNESS, SATURATED-BLUE PHOSPHOR. THE MOST PROMISING AVAILABLE CANDIDATE IS ZNS:TM, WHICH HAS EXCELLENTCHROMATICITY BUT LUMINANCE THAT IS TOO LOW BY 1-2 ORDERS OF MAGNITUDE. ITS WEAK EMISSION IS INCONSISTENT WITH ITS INTENSE BLUE CATHODOLUMINESCENCE AND PHOTOLUMINESCENCE AND IS DUE, MOST LIKELY, TO DEFECTS. WE PROPOSE TO MAXIMIZE THELUMINANCE OF ZNS:TM-TYPE PHOSPHORS AS A FUNCTION OF FILM STRUCTURE; OPTIMAL CHARGE COMPENSATION BY SPECIFIC ANIONS AND CO-ACTIVATION BY OTHER LANTHANIDES WILL ALSO BE ASSESSED. THIN PHOSPHOR FILMS WILL BE GROWN BY CONVENTIONALMETALORGANIC CHEMICAL VAPOR DEPOSITION AFTER A 10-30 NM SEEDLAYER IS FORMED BY ATOMIC LAYER EPITAXY IN THE SAME LARGE-AREA REACTOR. THE RESULTANT ESTABLISHMENT OF A UNIFORM LARGE-DIAMETER COLUMNAR GRAIN STRUCTURE IS EXPECTED TO GREATLY INCREASE ELECTROLUMINANCE. FURTHER, THIS DEPOSITION PROCESS IS CAPABLE OF LAYING DOWN ALL OF THE PRIMARY ZNS-HOST PHOSPHORS FOR FULL-COLOR DISPLAY IN A SINGLE CHAMBER, IT IS AMENABLE TO LOWER-COST NON-PHOTOLITHOGRAPHIC PIXEL DEFINITION, AND IT IS INHERENTLYSCALABLE.

* Information listed above is at the time of submission. *

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