BLUE PHOSPHORS FOR FULL-COLOR HIGH-DEFINITION VIDEO DISPLAY

Award Information
Agency:
National Science Foundation
Branch
n/a
Amount:
$249,988.00
Award Year:
1992
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Award Id:
11863
Agency Tracking Number:
11863
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Patriots Park, Bedford, MA, 01730
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Nasser Karam
Senior Staff Scientist
() -
Business Contact:
() -
Research Institute:
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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