Of importance with respect to the present invention is the hole blocking {TAIL ~ layer} which is comprised as schematically represented by formula a crosslinked polymer derived from crosslinking a silyl functionalized electron transport polymer with {HEAD ~ an organosilane} as represented by  
Of importance with respect to the present invention is the hole blocking { TAIL ~ layer } which is comprised as schematically represented by formula a crosslinked polymer derived from crosslinking a silyl functionalized electron transport polymer with { HEAD ~ an organosilane } as represented by
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH