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 {HEAD ~ the bottom multilayer stack}, and an organic light emitting region within the cavity layer 
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 { HEAD ~ the bottom multilayer stack } , and an organic light emitting region within the cavity layer
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH