Abstract
It is well known that the optical properties of multi-particle phosphor are crucial to the light performance of white light-emitting diodes (LEDs). Note that the optical properties including scattering or absorption properties for a single particle are easy to be calculated. However, due to the large computation considering the complicated re-scattering and re-absorption, it is difficult to calculate the scattering behaviors of the multi-particles. A common method to reduce the computation, which can cause unknown deviations, is to replace the multi-particle scattering properties by using the average scattering data of single particles. In this work, a cluster of multi-phosphor particles are directly simulated by the finite-difference time-domain (FDTD) method. The total scattering data of the cluster was processed as a bulk scattering parameter and imported to the Monte-Carlo ray-tracing (RT) method to realize a large-scale multi-particle scattering calculation. A polynomial mathematical model was built according to the multi-particle scattering data. An experiment was carried out for verifying the accuracy of the method in this work. The mean absolute percentages of the previous method are 1.68, 2.06, and 1.22 times larger than the multi-particle method compared with the experimental curves, respectively.
Highlights
A phosphor-converted white light-emitting diode (LED) is the most common setup to obtain high-quality white light with a high color rendering index, uniform color distribution, and high lumen [1,2,3]
To obtain more accurate and comprehensive results of multi-particle phosphor configurations with low computation, in this work, we proposed a multi-particle method, in which a cluster of multi-phosphor particles were directly simulated in the finite-difference time-domain (FDTD)
The difference with the multi-particle method is that the average method replaces the multi-particle scattering with the the multi-particle methoddata is that the average replacesscattering the multi-particle scattering by using average scattering of single particles.method
Summary
A phosphor-converted white light-emitting diode (LED) is the most common setup to obtain high-quality white light with a high color rendering index, uniform color distribution, and high lumen [1,2,3]. It is well known that the optical behaviors of phosphor particles are crucial to the quality of white light [4,5]. For obtaining accurate and comprehensive optical behavior of the phosphor particle, the ideal simulation should include all particles. The optical properties, including scattering and absorption, of a single particle, can be calculated. For the multi-particle configuration, the re-scattering and re-absorption among all particles are very complicated [6]. One method to solve this problem is to reduce the number of particles in the simulation. Qian et al [8] studied the scattering characteristics of phosphor particles with different particle radii. The re-scattering and re-absorption were omitted for reducing the calculation
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