| http://www.w3.org/ns/prov#value | - Also, a thin film of a metal having a low work function such as Li, Ca, Sr and Cs or a metal fluoride or oxide having a low work function such as LiF, CaF and LiO may be formed as the electron injection layer 6 a and a metal may be formed as the cathode 6 on the thin film. [0018] As the hole transfer layer 4, a material which has high hole mobility, is transparent and good filming characteristics
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