As explained above, according to this invention, {HEAD ~ the conversion} from the waveguide mode to the radiation mode is made possible by use of {TAIL ~ the mode conversion means}, thereby improving the light extraction efficiency of the light emitting device such as an organic EL light emitting device 
As explained above , according to this invention , { HEAD ~ the conversion } from the waveguide mode to the radiation mode is made possible by use of { TAIL ~ the mode conversion means } , thereby improving the light extraction efficiency of the light emitting device such as an organic EL light emitting device
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