{HEAD ~ An organic light emitting device} consists of {TAIL ~ a layered structure} including a top multilayer stack, a bottom multilayer stack, a cavity layer between the top multilayer stack and the bottom multilayer stack, and an organic light emitting region within the cavity layer 
consists of
{ HEAD ~ An organic light emitting device } consists of { TAIL ~ a layered structure } including a top multilayer stack , a bottom multilayer stack , a cavity layer between the top multilayer stack and the bottom multilayer stack , and an organic light emitting region within the cavity layer
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