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

Abstract

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.

Preparation of ZrO2/silicone hybrid materials for LED encapsulation via in situ sol‐gel reaction

“…The methoxy‐functionalized oligosiloxane was synthesized using a nonhydrolytic sol–gel condensation of VTMS, MPTMS, and DPSD (1:1:2 molar ratio) according to our previous reports . The monomers and Ba (OH) 2 ·H 2 O (0.15 mol% of the total monomers) as a basic catalyst were mixed and kept stirring at 80°C for 24 hours.…”

Transparent red ‐emitting silicone resin for color conversion and encapsulation of NUV light‐emitting diodes

“…24 It can effectively reduce the reflection, so that light can be successfully refracted through the encapsulation material, hereby enhancing the light extraction efficiency. 25 In this work, refractive index value of the EFHSN (0.5%) was measured to be 1.46, which also could satisfy the commercial need of LEDs. The colloidal suspension of exfoliated HTlc nanosheets in the EFHSN was confirmed by the Tyndall phenomenon, where a discernible track is observed when a laser beam passes through a colloidal solution as a result of light scattering (as shown in Figure 3C, the wavelength of laser beam is 650 nm).…”

Sulfur-Rich Ageing Mechanism of Silicone Encapsulant Used in LED Packaging: An Experimental and Molecular Dynamic Simulation Study

“…As one of the most environmentally friendly light sources, the light-emitting diode (LED) exhibits promising performances, such as long lifetime and low power consumption (Taguchi, 2008;Watzke and Altieri-Weimar, 2015;Singh and Tan, 2018;Tan et al, 2021), and LED is popular in the lighting industry since it is highly reliable and efficient (Zhang et al, 2016;Alim et al, 2021;Bento and Cardoso, 2021;Bispo-Jr et al, 2021). Silicones are polymeric substances consisting of repeating units of siloxane (alternating silicon and oxygen chains) and organic side groups, showing a high refractive index and high optical transparency (Lin et al, 2010;Kim et al, 2013;Tong et al, 2018;Kim et al, 2019). Therefore, they are widely used as one of the encapsulant materials in LED packaging with the functions of light-extraction and chip-protection.…”