Study of high-accuracy optical model of green phosphor pumped by ultraviolet laser

Q3 Physics and Astronomy

Results in Optics Pub Date : 2025-02-01 DOI:10.1016/j.rio.2025.100780

Huynh-Tuan- Anh Nguyen, Quang-Khoi Nguyen

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Abstract

We have developed an optical model for green phosphor pumped by ultraviolet (UV) laser. The model has begun with defining an efficient mathematical model to describe the emission of UV band and green light. Next, the data of peak emission wavelength, the width of the emission band, and emission wavelength range are extracted from the measurement of the emission spectrum of green phosphor pumped by UV-laser. These parameters are put in the mathematical model to simulate the emission spectrum of green phosphor pumped by UV laser. Finally, the optical model is verified with experiment measurement. A comparison process of simulation and experiment for the emission spectrum of UV light and green light have been conducted to roughly define the value of beta which shows the high overlap level between simulation to experimental spectra for the case spectra for UV and green bands, correspondingly. Next, the obtained result is applied in the optimized process to define the optimal beta value. The similarity of simulation and experiment is quantified using a normalized cross-correlation algorithm. The optimal values for the beta of 3.5 and 3.0 for UV and green bands, respectively. The developed model is applied to study the effect of green light on the optical properties of the output spectrum wherein different green/UV light power ratios of 1.0, 1.2, 1.4, 1.5, 1.6, 1.8, and 2.0, respectively. The output luminous flux is proportional to the power ratio of green/UV.