Synthesis of Hydrogen-Containing Methyl Phenyl Silicone Resins with a High Refractive Index for LED Encapsulation

Pan, Zhaoqun; Zeng, Kelin; Huang, Bingsheng; Zhu, Liqiang

doi:10.1007/s11664-020-08199-3

Cited by 7 publications

(4 citation statements)

References 18 publications

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“…Fourier transform infrared (FTIR) spectra from 4000~400 cm −1 were obtained by a Fourier transform infrared spectrometer (Nicolet iS50, Thermo Fisher, Boston, MA, USA) at 25 • C, and the simple pieces were made by spreading on KBr plate. 1 H NMR spectra were obtained with a superconducting nuclear magnetic resonance spectrometer (AVANCE III 600 MHz, Bruker, Karlsruhe, Germany) at 600 MHz with deuterated chloroform as solvent. The viscosities of resins at 25 • C were obtained by a revolving viscometer (C-PTD 180/AIR/QC, Anton Paar, Graz, Austria) at 800 rpm, and the complex viscosities of resins were measured by an HR-10 rotational rheometer in oscillating mode (1 Hz) at the heating rate of 3 • C min −1 .…”

Section: Characterizationmentioning

confidence: 99%

“…Silicone resin is an organicinorganic hybrid material with SiOSi chains and has been widely used in the fields of microelectronic [1][2][3], aerospace [4,5], and nuclear industries [6] due to its high thermal stability, low dielectric constant (low-k), and good mechanical properties. Silicone resin has great adjustability that could easily enhance or change its properties by adjusting organic groups.…”

Section: Introductionmentioning

confidence: 99%

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High Thermal Stability and Low Dielectric Constant of BCB Modified Silicone Resins

Wei

et al. 2023

Polymers

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Based on the excellent physical properties and flexible molecular modifiability, modified silicone resins have received favorable attention in the field of microelectronics, and recently a number of modified silicone resins have appeared while few breakthroughs have been made in low dielectric constant (low-k) materials field due to the limitations of structure or the curing process. In this work, functional silicone resin with different BCB contents was prepared with two monomers. The resins showed low dielectric constant (k = 2.77 at 10 MHz) and thermal stability (T5% = 495.0 °C) after curing. Significant performance changes were observed with the increase in BCB structural units, and the functional silicone obtained does not require melting and dissolution during processing because of good fluidity at room temperature. Moreover, the mechanical properties of silicone resins can be also controlled by adjusting the BCB content. The obtained silicone resins could be potentially used in the field of electronic packaging materials.

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Section: Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High Thermal Stability and Low Dielectric Constant of BCB Modified Silicone Resins

Wei

et al. 2023

Polymers

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“…The spectra of these light sources do not overlap with the photosynthetic spectra of plants, since the traditional LEDs lacked far-red light in the band from red light to far-red light (640-750 nm) [12]. Moreover, the traditional LEDs had the bottleneck of low luminous efficiency, color-rendering index difference, and low thermal stability [13][14][15]. LEDs exhibit light-emission efficiency through their internal quantum efficiency (IQE), light-extraction efficiency (LEE), and external quantum efficiency (EQE).…”

Section: Introductionmentioning

confidence: 99%

Preparation and Optical Property of Far-Red LED Encapsulated with the Graded-Index Fluorescent Glass Film

Liang

Wang

et al. 2023

Electronics

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Fabricating far-red light-emitting diodes (LEDs) with high emission efficiency is a change for the application in plant growth. In this work, a new type of far-red LED was fabricated for plant growth by encapsulating the Sr3LiSbO6:Mn4+, Mg2+ (SLSO:Mn4+, Mg2+) far-red phosphors with the gradient-refractive glass films. Under 365 nm excitation, the phosphors emitted the wide band in the 550–800 nm range, which overlapped with the absorption band of plants that absorb far-red light (PFR). The internal quantum efficiency (IQE) of the LED was 93.6%. Compared with the luminous efficacy of traditional (fluorescent silicone) LEDs (59 lm/W), the luminous efficacy of the new LED is increased by 62.7%, and reaches 96.74 lm/W. Thus, this far-red LED with high IQE has a long-term application prospect in plant growth.

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“…Ueda and colleagues have systemically synthesized and characterized a series of sulfur-containing HRIPs, and found that steric hindrance and molecular packing also affect the refractive index of polymers [21]. In addition, the introduction of nitrogen can increase the hydrogen bond density of the polymer to improve the refractive index [22]. Many groups and atoms such as polysulfide [23], cyclic sulfide [24], biphenyl [25], thianthrene [26], polyimide [27], poly(thiophosphate)s [28], phenyl sulfide [29], carbazole [30,31], pyrimidine [30,31], fluorene [32], sulfone [21] and triazines [33] have been widely studied to improve the refractive index of polymers.…”

Section: Introductionmentioning

confidence: 99%

High Refractive Index Diphenyl Sulfide Photopolymers for Solar Cell Antireflection Coatings

Zhang

Song

et al. 2022

Energies

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The anti-reflection film can effectively reduce the surface reflectivity of solar photovoltaics, increase the transmittance of light, and improve the photoelectric conversion efficiency. The high refractive index coating is an important part of the anti-reflection film. However, the traditional metal oxide coating has poor stability and complicated processes. To address this issue, we prepared two organic high refractive index (HRI) photopolymers by modifying epoxy acrylic acid with 4,4′-thiodibenzenethiol, which can be surface patterned by nanoimprinting to prepare antireflection coatings. As a result, two modified photopolymers with high refractive index (n > 1.63), high optical transmittance (T > 95%), and thermal stability (Tg > 100 °C) are obtained after curing. In particular, the diphenyl sulfide photopolymer modified by ethyl isocyanate acrylate has a refractive index up to 1.667 cured by UV light. Our work confirms that the organic HRI photopolymer can be obtained by introducing high molar refractive index groups, with potential to be applied as a PV cell power conversion efficiency material.

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Synthesis of Hydrogen-Containing Methyl Phenyl Silicone Resins with a High Refractive Index for LED Encapsulation

Cited by 7 publications

References 18 publications

High Thermal Stability and Low Dielectric Constant of BCB Modified Silicone Resins

High Thermal Stability and Low Dielectric Constant of BCB Modified Silicone Resins

Preparation and Optical Property of Far-Red LED Encapsulated with the Graded-Index Fluorescent Glass Film

High Refractive Index Diphenyl Sulfide Photopolymers for Solar Cell Antireflection Coatings

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