Effect of thermal aging on the optical, dynamic mechanical, and morphological properties of phenylmethylsiloxane-modified epoxy for use as an LED encapsulant

Hsu, Chia-Wen; Chen‐Chi, M.; Tan, Chung‐Sung; Li, Hsun-Tien; Huang, Shu-Chen; Lee, Tzong‐Ming; Tai, Hsin

doi:10.1016/j.matchemphys.2012.03.070

Cited by 30 publications

(17 citation statements)

References 31 publications

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“…[5][6][7] Silicone resins are excellent in terms of thermal stability and UV resistance, but they are relatively weak with regards to their adhesion and mechanical strength. 8 …”

Section: Introductionmentioning

confidence: 99%

Study of thermal and optical properties of epoxy/organically modified silicate hybrids

Wu¹,

Cheng²,

Wang³

et al. 2016

Mat Express

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Three epoxy resins were examined in this study: Eporite-901 (474 g/eq), Eporite-904 (807 g/eq) and Eporite-909 (1915 g/eq), which are bisphenol-A-type epoxy resins. In this study, we used an amine terminated organically modified silicate (Ormosil) that was compatible with the diglycidyl ether of bisphenol-A epoxy to partially replace the epoxy resin at various ratios, cured by hexahydrophthalic anhydride (HHPA). The thermal and optical properties of the Ormosil-modified epoxy resins (Epoxy/Ormosil) were studied. The M n and M w of the resulting hybrids were in the range of 10668-31450 and 30617-120422, respectively, with a polydispersity index range of 2.870-3.829. The thermogravimetric analysis (TGA) results implied that Ormosil can raise the crosslink density and enhance the thermal properties. The optical properties were measured after curing and thermal aging of the polymer films with thickness around 8-10 mm. The refractive indexes of the Epoxy/Ormosil hybrids were 1.62-1.68, and the transmittances of the cured composites were above 85% in the visible wavelength.The key attributes of Epoxy/Ormosil hybrids that make them attractive materials for LEDs including their high transparency in the UV-visible region, controlled refractive index (RI), and excellent thermal resistance.

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“…[5][6][7] Silicone resins are excellent in terms of thermal stability and UV resistance, but they are relatively weak with regards to their adhesion and mechanical strength. 8 …”

Section: Introductionmentioning

confidence: 99%

Study of thermal and optical properties of epoxy/organically modified silicate hybrids

Wu¹,

Cheng²,

Wang³

et al. 2016

Mat Express

View full text Add to dashboard Cite

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“…It has been widely used in areas such as transportation signs, displays, and automotive lighting. [1][2][3] The external quantum efficiency of LEDs is decided by both its internal quantum efficiency and its light extraction efficiency (LEE). 4 However, the LEE of LEDs is limited due to the differences in the interface refractive index (RI) of LED chips, encapsulants, and the surrounding air.…”

Section: Introductionmentioning

confidence: 99%

Highly transparent thermal stable silicone/titania hybrids with high refractive index for LED encapsulation

et al. 2015

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Silicone/titania hybrids for LED encapsulation were synthesized via hydrolysis and condensation reaction between tetrabutyl titanate and silica sol containing phenyl groups and long alkyl chains. Crack-free thick films ($1 mm) were fabricated by curtain painting. The hybrid films with different Ti contents were characterized by FTIR, UV-VIS, TGA/ DSC, AFM, TEM, ellipsometer, etc. Results show that the hybrid films contain long alkyl chains which have high thermal stability against yellowing owing to the steric hindrance given by long alkyl chains. The hybrid films have high transmittance ( ‡98% in visible range) and high refractive index (1.591-1.681). In LED encapsulation, the silicone/titania hybrids with an RI of 1.605 increased the light extraction efficiency of bare blue LEDs by 19.4%.

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“…We have previously described the use of a thermal curing process for the fabrication of a transparent hybrid based on DGEBA and phenylmethylsiloxane-modified epoxy (PMSE) [4].…”

Section: Introductionmentioning

confidence: 99%

Positron annihilation lifetime spectroscopy study on the structural relaxation of phenylmethylsiloxane-modified epoxy hybrids at different aging temperatures

Hsu

Chen‐Chi

Tan

et al. 2015

Materials Chemistry and Physics

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Effect of thermal aging on the optical, dynamic mechanical, and morphological properties of phenylmethylsiloxane-modified epoxy for use as an LED encapsulant

Cited by 30 publications

References 31 publications

Study of thermal and optical properties of epoxy/organically modified silicate hybrids

Study of thermal and optical properties of epoxy/organically modified silicate hybrids

Highly transparent thermal stable silicone/titania hybrids with high refractive index for LED encapsulation

Positron annihilation lifetime spectroscopy study on the structural relaxation of phenylmethylsiloxane-modified epoxy hybrids at different aging temperatures

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