Open AccessImprovement of phosphor modeling based on the absorption of Stokes shifted light by a phosphor
Author(s) -
Sie-Wook Jeon,
Ju Hyun Noh,
KiHyun Kim,
Wan Ho Kim,
Changhun Yun,
Sang-Bin Song,
Jae Pil Kim
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.0a1237
Subject(s) - phosphor , chromaticity , color rendering index , materials science , optics , color temperature , absorption (acoustics) , optoelectronics , visible spectrum , stokes shift , absorption spectroscopy , luminescence , physics
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.