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