| http://www.w3.org/ns/prov#value | - For a polymer LED the cathode preferably has a work function of less than 3.5 eV and may comprise a first layer having a low work function, for example a metal such as calcium, magnesium or barium, and a second layer adjacent the LEP layer 108 b providing efficient electron injection, for example of barium fluoride or another metal fluoride or oxide.
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