Two-Part Gauss Simulation of Phosphor-Coated LED

Gauss simulation is an effective tool for designing light-emitting-diode (LED) light sources. This paper proposes a new two-part Gauss simulation model to simulate a YAG:Ce phosphor-coated LED (PC-LED). This model divides the emission spectra of YAG:Ce phosphor into two parts, and they use different half spectral widths in the Gauss function to accurately simulate the spectra of YAG:Ce PC-LED. The simulated spectra are similar to the measured spectra of packaged LEDs; most correlated color temperature (CCT) error is less than 4%, color rendering index (CRI) error is less than 2, and luminous efficacy of radiation (LER) error is less than 3% for simulation results. This is a vast improvement on an ordinary single Gauss simulation model. Using the model to analyze the combination of common blue LED and YAG:Ce phosphor helps the design of new white LEDs.