As explained above, according to this invention, the conversion from {HEAD ~ the waveguide mode} to {TAIL ~ the radiation mode} is made possible by use of 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 , the conversion from { HEAD ~ the waveguide mode } to { TAIL ~ the radiation mode } is made possible by use of 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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