Abstract
This article studies the development method of pc-LED, a phosphor-converted lighting emitting diode, with scattering enhancement particles (SEPs) at 7000 K correlated color temperature. The pc-LED is an advanced lighting solution that has been applied in many different categories; nonetheless, to keep up with the demands of modern lighting, the pc-LEDs need to enhance the color homogeneity and luminous flux. The detailed experiments on the two SEPs used in the articles are also presented. The experiments include combining each of these SEPs with a yellow phosphor Y3Al5O12:Ce3+ to test their properties and influences on the lighting of pc-LEDs. The scattering coefficients, the anisotropic scattering, the reduced scattering, and the scattering amplitudes at 450 nm and 550 nm are the subjects of SEPs study. The LightTools program is used to create the simulation of pc-LED, the results of the optical simulation will then be verified with the Mie-scattering theory. The findings of the research conclude that TiO2 particles are the best for the growth of color homogeneity while CaCO3 particles are effective in limiting the color deviation in correlated color temperature. Even though the SEPs benefit the lighting performance, their concentration must be managed to be under an acceptable amount to ensure desired results and avoid unwanted damages.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
Highlights
The pc-LED with formidable characteristics such as high reliability, cost and energy efficiency, and environmental friendliness has earned much attention in the lighting industry in recent years
The most common method to fabricate white light is to blend the yellow light from the mixture of yellow phosphor YAG:Ce3+ and silicone glue with the blue light from the LED chips
There are many research results pointing out the positive impacts of these scattering enhancement particles (SEPs) on lighting performance of pcLED, the Titania (TiO2) particles, when presents in the phosphor layer at 0.1%, can increase the color quality [11,12,13]
Summary
The pc-LED with formidable characteristics such as high reliability, cost and energy efficiency, and environmental friendliness has earned much attention in the lighting industry in recent years. This article developed the idea presented in the previous one by providing the investigated information based on Mie-theory, which has not been demonstrated in previous papers It focused more on analyzing the application of two SEP particles (CaCO3 and TiO2). From the attained results of this paper, the manufacturers can choose the appropriate SEP with corresponding concentration and particle size to improve the color quality and lumen performance of LED products. This article presents these experimental results in 2 sections with section 2 demonstrating the scattering amplitude of pc-LED, and section 3 presenting the equations used to calculate optical parameters and comparing the achieved results.
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