(19)

(11)

EP 2 638 577 A2

(12)

(88) Date of publication A3: 22.11.2012 (43) Date of publication: 18.09.2013 Bulletin 2013/38 (21) Application number: 12746750.4 (22) Date of filing: 14.02.2012

(51) International Patent Classification (IPC):  H01L 51/42(2006.01) H01L 51/48(2006.01) (86) International application number: PCT/US2012/025028 (87) International publication number: WO 2012/112533 (23.08.2012 Gazette 2012/34)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 14.02.2011 US 201161442561 P (71) Applicant: University Of South Florida Tampa, FL 33612 (US)	(72) Inventors: JIANG, Xiaomei Tampa, Florida 33647 (US) LEWIS, Jason Lutz, Florida 33559 (US) (74) Representative: Wilson Gunn  5th Floor Blackfriars House The Parsonage Manchester M3 2JA Manchester M3 2JA (GB)