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