Organic electroluminescent device using optical resonance effect

Provided is an organic electroluminescent device capable of inducing optical resonance with a simple structure, the organic electroluminescent device including: a transparent substrate (31); a semi-transparent layer (34) formed on the transparent substrate; a first anode layer (35) formed on the semi-transparent layer (34) as a predetermined pattern; a cathode layer (37) formed of a metallic total reflection layer on the first anode layer; and an organic layer (36) formed between the first anode layer and the cathode layer, which includes at least an emitting layer, wherein the optical distance between the top surface of the semi-transparent layer (34) and the bottom of the cathode layer (37) is determined to be the least integer multiple of the half bandwidths of the peak wavelengths of light of various colours. Due to a resonance effect of the organic electroluminescent device, the emission efficiency of wavelengths of light of different colours is improved, and high-purity quality pictures can be displayed on the organic electroluminescent device.