| http://www.w3.org/ns/prov#value | - A hole injection layer 16 transmitting light is formed on the protective layer 15 and the anode layers 13 a, a light-emitting layer 17 emitting light from its surface is formed of an EL material and is disposed on the hole injection layer 16, the cathode layer 18 is formed of a metal material such as aluminum, potassium, and magnesium and is disposed on the light-emitting layer 17.
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