From the result of simulation of {HEAD ~ the light extraction efficiency}, the present inventors have took note of the fact that the great proportion of the light emitted from {TAIL ~ the organic EL layer} comes to assume the transparent electrode waveguide mode or the transparent substrate waveguide mode 
From the result of simulation of { HEAD ~ the light extraction efficiency } , the present inventors have took note of the fact that the great proportion of the light emitted from { TAIL ~ the organic EL layer } comes to assume the transparent electrode waveguide mode or the transparent substrate waveguide mode
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