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

Lai, Yawen; Jin, Lujiang; Hang, Jianzhong; Shi, Liyi

doi:10.1007/s11998-015-9681-4

Cited by 17 publications

(17 citation statements)

References 27 publications

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“…This method allows to achieve a good dispersion of the in‐situ formed metal oxide nanoparticles in polymer matrix. However, due to a significant difference in hydrolytic reactivity of titanium alkoxides and alkoxy functional silanes or siloxanes, preparation of the homogenous hybrid resin by hydrolytic or non‐hydrolytic sol–gel process is very challenging …”

Section: Introductionmentioning

confidence: 99%

Reactions of titanium alkoxide with SiH containing polymers as a route to titanium/siloxane hybrid materials with enhanced refractive index

Rubinsztajn

Chojnowski

Cypryk

et al. 2020

Applied Organom Chemis

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Reactions of titanium tetrabutoxide with polyhydromethylsiloxane (PHMS) and with some hydromethylsiloxane copolymers were used for synthesis of light transparent materials having enhanced refractive index. The FTIR, 1H NMR and 29Si NMR spectroscopies were used to study the reaction between PHMS and titanium tetrabutoxide in toluene. Reaction of SiH functional siloxane polymers with titanium tetrabutoxide results in a titanium‐containing heterosiloxane prepolymers that are stable under anhydrous anaerobic conditions. Exposure of the resulting materials to humid air transforms them into light transparent titanium/siloxane nanocomposites with enhanced refractive index. The films of these composites formed during the spin‐coating process were characterized by UV–Vis, ellipsometry, IR and 29Si NMR spectroscopies and transmission electron microscopy (TEM). Titanium/siloxane hybrid films obtained on the basis of poly(phenylmethylsiloxane‐co‐hydromethylsiloxane) copolymer are free of cracks and have a refractive index of up to 1.60.

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Section: Introductionmentioning

confidence: 99%

Reactions of titanium alkoxide with SiH containing polymers as a route to titanium/siloxane hybrid materials with enhanced refractive index

Rubinsztajn

Chojnowski

Cypryk

et al. 2020

Applied Organom Chemis

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“…synthesized zirconium‐phenyl siloxane hybrid material via hydrosilation‐curing of sol–gel‐derived multifunction siloxane resins containing phenyl‐groups and Zr‐O‐Si heterometallic phase for achieving RI of 1.58. Lai et al . reported silicone/titania hybrids for LED encapsulation, which were synthesized via hydrolysis and condensation reaction between tetrabutyl titanate and silica sol containing phenyl groups and long alkyl chains.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Kim et al 25 synthesized zirconium-phenyl siloxane hybrid material via hydrosilation-curing of sol-gel-derived multifunction siloxane resins containing phenyl-groups and Zr-O-Si heterometallic phase for achieving RI of 1.58. Lai et al 26 reported silicone/titania hybrids for LED encapsulation, which were synthesized via hydrolysis and condensation reaction between tetrabutyl titanate and silica sol containing phenyl groups and long alkyl chains. Due to the significant difference between the reactivity of metal alkoxides and siloxane, the hydrolytic condensation process strongly depended on the type of reactants, adding order, temperature, and pH value of medium, so that the homogenous structure resin was complicated and difficult to synthesis.…”

Section: Introductionmentioning

confidence: 99%

A facile route to prepare homogeneous silicone resin doped with titanium

Chen

Huang

et al. 2019

J of Applied Polymer Sci

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A facile route was introduced to prepare homogeneous silicone resin doped with titanium hybrid with high refractive index (RI). Specifically, the hybrids were obtained from the transesterification of hydroxyl‐phenyl‐vinyl silicone resin and titanium isopropoxide under anhydrous conditions. The structures of hybrid silicone and their corresponding intermediates (hydroxyl‐phenyl‐vinyl silicone) were characterized by nuclear magnetic resonance spectroscopy (1H NMR, 29Si NMR) as well as Fourier transform infrared spectroscopy (FTIR). The hybrids had a transmittance of more than 88% ranging from 450 nm to 800 nm, a high RI of 1.585, and a lower water vapor permeability of 3.58 g /m2.24h. Results from FTIR showed intensity of Ti‐O‐Si bond in hybrid decrease with extended the storage time, but the properties of cured hybrids including optical, mechanical, and gas permeability were not influenced. Compared to chips encapsulated with pure silicone, the luminous efficiency of the chips encapsulated with hybrids was improved from 138.6 lm/W to 156.4 lm/W. The thermal shock and hygrothermal aging test also demonstrated the hybrids had a wide range application in light‐emitting diode (LED) packaging. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47834.

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“…Compared with the traditional lighting source, LED has higher luminous efficiency, and its efficiency is not subject to shape and size constraint. Meanwhile, LED also exhibits obvious advantages, such as low energy consumption, simple structure, long life, and fast response time . Single LED chip is difficult to directly apply to the actual lighting or other light‐emitting equipment in virtue of its susceptibility to various unfavorable factors in the environment, so that packaging technology is a necessary aspect for the practical application of LED lighting.…”

Section: Introductionmentioning

confidence: 99%

High refractive index adamantane‐based silicone resins for the encapsulation of light‐emitting diodes

Lin

Feng

Sun

et al. 2018

Polymers for Advanced Techs

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The encapsulation of high power light emitting diode (LED) needs the silicone resins to have relative high refractive index and thermal-aging properties. Herein, high refractive index adamantane-based phenyl epoxy-silicone (APES) resins for LED encapsulation were synthesized by the sol-gel condensation of 1-adamantane methanol propyltrimethoxysilane-3-urethane, γ-(2,3-epoxypropoxy)propytrimethoxysilane and diphenylsilanediol. These adamantane-based silicone resins have multifunctional groups including adamantyl group, phenyl group, and epoxy group in order to meet the various requirements for LED encapsulation. Importantly, the adamantane group in the silicone resins benefits for high refractive index and anti-thermal properties.These APES resins were characterized by proton nuclear magnetic resonance and Fourier transform infrared spectroscopy. When APES resins were cured by methylhexahydrophthalic anhydride, they showed relatively high refractive index of 1.56, high hardness, and high thermal resistance. The encapsulated LED demonstrated high adhesion properties by red-ink tests. These merits make adamantane-based silicone resins promising candidates as LED encapsulation materials.

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

Cited by 17 publications

References 27 publications

Reactions of titanium alkoxide with SiH containing polymers as a route to titanium/siloxane hybrid materials with enhanced refractive index

Reactions of titanium alkoxide with SiH containing polymers as a route to titanium/siloxane hybrid materials with enhanced refractive index

A facile route to prepare homogeneous silicone resin doped with titanium

High refractive index adamantane‐based silicone resins for the encapsulation of light‐emitting diodes

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