An important mechanics of light extraction in organic light-emitting diode (OLED) is the propagation of electromagnetic field. However, the critical cause of the enhancement of emissive efficiency is how to control the electromagnetic waves of different phase superpose efficaciously. The influence of the phase difference comes from the reflection and transmission of electromagnetic wave, and their coefficients are distinct depend on the characteristic of material. Therefore, we rely on the analysis of material parameter and each traveling waves in OLED for the guide of optimum thickness. We used the tool of self-development FDTD (Finite-Difference Time-Domain method) simulation code to establish OLED model (the information provided by CHEL) and simulate specific modulated results. With the use of three optimized structure models, there are specific improvements of 47%, 4.9 times and 2.28 times approximately in the extraction efficiency of the OLED is expected theoretically.

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