Abstract
Organic light emitting diode (OLED) has a feature of low heat-generation because it has high efficiency. OLED is expected to use as domestic lighting, lighting for plant production and so on. Emission layer of OLED is sandwich structure between an anode and a cathode. The emission spectrum from OLED is affected by interference effect in the layered structure. It depends on film thickness and optical properties of materials. Therefore, the emission spectrum control requires appropriate determination of these two kinds of parameters. The purpose of our study is emission spectrum control of OLED by optimization of film thickness and optical properties. A combinatorial optimization method based on genetic algorithms is used for the optimization method of two kinds of parameters. Objective function is composed of the color of emitted lights and the intensity of emission spectrum. We report some results on the multi-objective optimization in structural design of OLED for examples of plant cultivation illumination.
