Improved spectral mismatch and performance of a phosphor-converted light-emitting diode solar simulator

Napat Watjanatepin (Rajamangala University of Technology Suvarnabhumi)
Khanittha Wannakam (Rajamangala University of Technology Suvarnabhumi)
Paiboon Kiatsookkanatorn (Rajamangala University of Technology Suvarnabhumi)
Chaiyant Boonmee (Rajamangala University of Technology Suvarnabhumi)
Patcharanan Sritanauthaikorn (Rajamangala University of Technology Suvarnabhumi)

International Journal of Electrical and Computer Engineering
Vol 13, No 5: October 2023

A phosphor-converted light-emitting diode (LED) solar simulator is an illuminance device that produced irradiance intensity and spectral close to the sunlight. It is determined as spectral mismatch, non-uniformity of irradiance, and temporal instability. This paper has improved the LED solar simulator (LSS) system to have a spectral distribution consistent with the AM1.5G spectrum at 100%. It was developed as a new prototype to have the AAA class spectral characteristics, time instability, and inconsistency according to IEC 60904-9. The results showed that an optimal approach was to use phosphor-converted natural white LED (pc-nWLED), combining a monochromatic near-infrared (NIR) (730, 800, 850, 940, and 1,000 nm) as well as the proposed LSS system capable of generating 1,000 W/m2 irradiation over the test plane of 125×125 mm and operated continuously in a constant temperature LED state for at least 2 hours, therefore suitable for demonstration of solar cell features under standard test condition (STC) in the laboratory.