[논문]Study on the Optical Properties of Light Diffusion Film with Plate Type Hollow Silica

Lee, Ji-Seon; Moon, Seong-Cheol; Noh, Kyeong-Jae; Lee, Seong-Eui

doi:10.4191/kcers.2017.54.5.05

Abstract ▼ AI-Helper

Micro hollow plate type silica with low refraction properties was synthesized and its hollow structure was applied as an optical structure to develop a light diffusion material that simultaneously satisfies the requirements of good light diffusibility, high transmissibility, and high luminance. The ...

Micro hollow plate type silica with low refraction properties was synthesized and its hollow structure was applied as an optical structure to develop a light diffusion material that simultaneously satisfies the requirements of good light diffusibility, high transmissibility, and high luminance. The developed light diffusion material was applied to a light diffusion film and the film's optical properties were assessed. Hollow silica was synthesized by precipitation method using $Mg(OH)_2$ core particles, sodium silicate, and ammonium sulfate as the silica precursors. The concentration of the silica precursor was adjusted to control hollow silica shell thickness. The total light transmittance of the light diffusion film composed of the hollow silica was 94.55%, which was 4.57% higher than that of the PC film; new film's haze was 71.20%, which was 70.9% higher. Furthermore, the luminance increased by 5.34% compared to that of the light source. The reason for the results is not only that the micro plate type hollow silica, which has a low refractive property, played a role in reducing the difference in refractive index between the medium boundaries, but also that there was a light-concentrating effect due to the changing of light paths to the front direction inside the hollow structure. Optical simulation verified the enhanced optical properties when hollow silica was applied to the light diffusion film.

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문제 정의

The objective of this study was to comparatively analyze ray paths both when the particle internal structure is hollow and when it is solid, as well as to determine any consequential changes in the light and illuminance distributions. Solid and hollow plate type silica particles were each modeled and both models had surface properties of 80% for transmittance, 20% for reflectivity, and 1.

제안 방법

In this study, a hollow silica applied light diffusion film was fabricated and, when the film was layered on top of the light source, the light source luminance, transmissibility, and haze variations were measured to investigate the applicability of this hollow silica material as a light diffusion material.
In this study, micro hollow plate type silica with low refraction properties was synthesized and its hollow structure was applied as an optical structure to develop a light diffusion material that simultaneously satisfies the requirements of good light diffusibility, high transmissibility, and high luminance. The developed light diffusion material was applied to a light diffusion film and the film’s optical properties were assessed.
The objective of this study was to comparatively analyze ray paths both when the particle internal structure is hollow and when it is solid, as well as to determine any consequential changes in the light and illuminance distributions. Solid and hollow plate type silica particles were each modeled and both models had surface properties of 80% for transmittance, 20% for reflectivity, and 1.46 for refractive index. The light source was set with a flux of 0.
The Essential Macleod program was used to carry out a simulation to determine the transmittance variation according to the hollow silica shell thickness. The material properties of the film were inputted to the program, which then determined the transmittance, reflection, and absorption according to the thickness.
5, in which the air layer thickness was set at 100 nm, which was the hollow height identified through TEM, and the silica layer thickness values were set at 14, 19, 27, and 32 nm. Using these settings, transmittance variation simulation according to the hollow silica shell thickness was performed.

대상 데이터

Among the display technologies, LCD is a non-self-luminous display, so an additional light source device called a back light unit (BLU) is located at the rear of the display to provide a uniform planar light. The BLU is composed of a light guide panel, reflector, diffusion sheet, and two prism layers.

이론/모형

In this study, the hollow silica light diffusion material was synthesized using the core-shell precipitation method with micro plate type Mg(OH)₂ particles as the core. Before the silica shell formation reaction, Mg(OH)₂ powder (Mg(OH)₂, KISUMA5A, 98%, average particle size 0.

성능/효과

Through this, it can be observed that the hollow silica shell thickness affects the light diffusion film transmittance. Although the simulation results and the actual total light transmittance measurement results showed similar overall trends, the quantitative values differed because the real light diffusion film is a number of layers of hollow silica particles with irregular particle arrangements, and the number of particles and the particle arrangement could not be included into the simulation design.
Here, it was predicted that minimizing the ratio of the hollow silica shell and maximizing the volume of the air layer with a low refractive index will result in a further lowering of the refractive index, and that such reduction will decrease the refractive index difference with the medium (air), resulting in transmittance enhancement. The actual measurement results revealed that the total light transmittance improved when the shell thickness was very small and the total light transmittance decreased from 94.55% to 81.75% as the shell thickness increased.
The total light transmittance and haze were measured for films fabricated using solid spherical silica powder (spherical 6~9 μm, SUNSIL-130, Sunjin Beauty Science, Korea), which is generally used as a light diffusion material, and PMMA powder (spherical 5~10 μm, SUNPMMA-S, Sunjin Beauty Science, Korea) under the same conditions. The measurements showed that the transmissibility when using the PMMA powder was good, with 91.41% total light transmittance and 10.43% haze; however, this sample showed insufficient light diffusing properties. On the other hand, use of the silica powder resulted in 80.
Through this, it was predicted that hollow silica enhances the straightness of the light and brings about a focusing effect. The ray tracking results from the 3D optical simulation showed improvement of the light straightness within the hollow structure.
The total light transmittance of the micro hollow plate type silica applied light diffusion film increased from 81.75% to 94.55% as the hollow silica shell thickness decreased, while haze decreased from 89.46% to 71.20%. The total light transmittance due to the hollow silica light diffusion film increased because of the hollow silica material, which has low refraction properties that decrease the refractive index difference at the medium interface.

참고문헌 (16)

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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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