{HEAD ~ The period} of the effective wavelength degree makes possible effective interference with the light emitted from the organic EL layer and improves {TAIL ~ the light extraction efficiency} of the organic EL light emitting device 
improves
{ HEAD ~ The period } of the effective wavelength degree makes possible effective interference with the light emitted from the organic EL layer and improves { TAIL ~ the light extraction efficiency } of the organic EL light emitting device
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH