Enhancement of physical and optical performances of polycarbonate‐based diffusers for direct‐lit LED backlight unit by incorporation of nanoclay platelets

Kim, Hyo Jin; Kim, Seong-Woo

doi:10.1002/app.42973

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…It is usual to find diffusing elements in display backlights and luminaires. [1][2][3] Fluorescent materials are another relevant example of a material that exhibits volume scattering. Fluorescent materials, in the form of phosphors, are ubiquitous in lighting as they provide the most efficient way to create white light with solid-state sources such as LEDs.…”

Section: Introductionmentioning

confidence: 99%

Accurate and robust characterization of volume scattering materials using the intensity-based inverse adding-doubling method

Correia

Hanselaer

Meuret

2019

Modeling Aspects in Optical Metrology VII

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In several different research disciplines, modelling and simulating light propagation through volume scattering materials is a key necessity. Simulating diffusing and fluorescent materials in solid-state lighting and the interactions between intense light and skin tissue in biomedicine are just some examples of the widespread need for accurate volume scattering models. Although modelling volume scattering materials is important for several research fields, there is still no widespread reporting of model properties or of accurate and robust tools to estimate them, especially for lighting research. Most often, researchers estimate the scattering model properties, i.e. the absorption and scattering coefficients and the anisotropy factor, using Mie solutions. These are generally based on rough estimates of the scattering particle's properties and assume that the particle is perfectly spherical or cylindrical. This approach is not well suited for the myriad of volume scattering materials available for illumination research. Our work uses the intensity-based inverse adding-doubling (i-IAD) method to estimate the volume scattering model properties of samples. In this work, we investigate the feasibility of this method in an experimental scenario by studying samples made with two different scattering particles embedded in a transparent polymer with different scattering particle concentrations and sample geometries. The light scattered by the samples is measured and their volume scattering properties estimated with i-IAD. We show the accuracy and robustness of i-IAD by extrapolating the scattering parameters obtained for low concentration samples to higher concentrations and comparing simulations with experiments for these higher concentrations. Furthermore, measurements of samples that contain both types of scattering particles were also accurately simulated using the model parameters estimated from low concentration samples. This work demonstrates that the intensity-based inverse adding-doubling method provides accurate estimates for the volume scattering model parameters and that they can be generalized for different concentrations, geometries and scattering particle mixtures.

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Section: Introductionmentioning

confidence: 99%

Accurate and robust characterization of volume scattering materials using the intensity-based inverse adding-doubling method

Correia

Hanselaer

Meuret

2019

Modeling Aspects in Optical Metrology VII

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“…For the specific case of lighting, the volume scattering properties of materials are tailored by manufacturers and researchers in order to develop diffusers with specific transmitted and reflected scattered light distributions. Such diffusers, are ubiquitous in lighting luminaires and display backlights [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Determination of volume scattering parameters that reproduce the luminance characteristics of diffusers

et al. 2016

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The extension of a well-known inverse technique, inverse adding-doubling (IAD), is investigated for determining the volume scattering properties of diffusers for display and lighting applications. The luminance characteristics of volume scattering diffusers are vital for these applications. Through a simulation study, it is shown that fitting solely to the scattered (angular) intensity information with the extended IAD method, results in a volume scattering characterization that also reproduces the correct (spatial and angular) luminance characteristics for a wide range of samples. The gap between the simulation work and the experimental application of the investigated fitting procedure is bridged by considering the effect of experimental error in the scattered intensity distributions. This does not significantly alter the presented conclusions.

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Synthesis of organosiloxane-coated SiO2/CeO2 with multilayered hierarchical structure and its application in optical diffusers

Zhong

Zhou

et al. 2017

J Mater Sci

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Enhancement of physical and optical performances of polycarbonate‐based diffusers for direct‐lit LED backlight unit by incorporation of nanoclay platelets

Cited by 7 publications

References 28 publications

Accurate and robust characterization of volume scattering materials using the intensity-based inverse adding-doubling method

Accurate and robust characterization of volume scattering materials using the intensity-based inverse adding-doubling method

Determination of volume scattering parameters that reproduce the luminance characteristics of diffusers

Synthesis of organosiloxane-coated SiO2/CeO2 with multilayered hierarchical structure and its application in optical diffusers

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