H ELECTRICITY
H10 SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
H10K ORGANIC ELECTRIC SOLID-STATE DEVICES
H10K50/00 Organic light-emitting devices
H10K50/80 Constructional details
H10K50/85 Arrangements for extracting light from the devices
H10K50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair