According to the invention, {HEAD ~ the light extraction efficiency} of {TAIL ~ conventional light emitting devices} such as organic EL light emitting devices is improved by using mode conversion means so as to solve the problem that conventional light emitting devices such as organic EL light emitting devices have low light extraction efficiencies 
According to the invention , { HEAD ~ the light extraction efficiency } of { TAIL ~ conventional light emitting devices } such as organic EL light emitting devices is improved by using mode conversion means so as to solve the problem that conventional light emitting devices such as organic EL light emitting devices have low light extraction efficiencies
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