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Improvement of phosphor modeling based on the absorption of Stokes shifted light by a phosphor

Sie-Wook Jeon, Ju Hyun Noh, Ki Hyun Kim, Wan Ho Kim, Changhun Yun, Sang Bin Song, and Jae Pil Kim

Open Access Open Access

Abstract

We have found that the emission spectrum of phosphors measured in the powder state differs from that measured for a single phosphor. When the emission spectrum of the powder state is adopted in an optical simulation, the simulated optical properties e.g., the correlated color temperature, color rendering index, and chromaticity coordinates, show a remarkable discrepancy from those of the fabricated LED package. However, the discrepancy is significantly improved when the emission spectrum from a low concentration of phosphor in a silicone binder is employed. We suggest that the discrepancy originates from the absorption of Stokes shifted light by a phosphor.

© 2014 Optical Society of America

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Figures (5)
Fig. 1
Fig. 1 Schematic diagram of (a) the system for measuring the excitation, quantum yield, and emission spectra of phosphors and (b) the interaction between the excitation light and a phosphor particle.

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Fig. 2
Fig. 2 Spectra from the YAG:Ce3 + phosphor: (a) excitation and emission spectra in the powder state; (b) comparison of emission spectra from 0.5 wt%, 2.5 wt%, and 6 wt% films and phosphor powder. The emission spectra are normalized with peak intensity.

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Fig. 3
Fig. 3 Spectra of the silicate-based phosphor: (a) excitation and emission spectra in the powder state; (b) comparison of emission spectra from 0.5 wt%, 2.5 wt%, and 6 wt% films and phosphor powder. The emission spectra are normalized with peak intensity.

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Fig. 4
Fig. 4 Image and optical model of the LED package with silicone encapsulation including the phosphor.

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Fig. 5
Fig. 5 Comparison of emission spectra between fabricated samples (solid lines) and simulation results (dotted lines). (a), (b) are emission spectra from LED packages made of YAG:Ce3 + phosphor concentration of 8 wt%, and (c), (d) are those from LED packages made of silicate-based phosphor concentration of 9 wt%. Simulations are performed with emission spectrum from the powder state ((a), (c)) and the 0.5 wt% films ((b). (d))

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Tables (1)

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Table 1 Comparison of chromatic performance factors for YAG:Ce3+ and silicate-based phosphors

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