Abstract
Mass fraction of phosphor in silicone and aging time play important roles in the optics and mechanical performance of the silicone that is used in the light emitting diode (LED) package. In this paper, the mechanical properties of silicone/phosphor composites are investigated experimentally by separate tensile and compression tests. Distribution of the phosphors is observed by scanning electron microscopy (SEM) to ensure the homogeneity of the samples. Different loading rates are applied to study the silicone material’s rate-dependent properties. The experimental results of the tensile and compression test show that the Young’s modulus increases with the mass fraction of phosphor in silicone. Longer aging time stiffens the silicone composite and weakens the ductility of the materials. A three-dimensional model used cohesive zone material (CZM) between the interface of the phosphor particles, and matrix silicone is built up to study the degradation mechanism at a micro-scale level. The simulation results indicate that the diameter of particles in silicone also impacts its interface debonding and crack growth. The theoretical results concerning the mass fraction of phosphor are in good agreement with the experiments.
Highlights
Their high efficiency and reliability led white light-emitting diodes (LEDs) to become an indispensable solid-state light source for indoor and outdoor illumination [1,2,3,4]
According to the work by Zhaohui Chen et al [8,9,10,11], it was found that the mechanical properties of silicone composite have a great influence on the life time of LED products
16, and strain is controlled at 0.1significant to avoid
Summary
Their high efficiency and reliability led white light-emitting diodes (LEDs) to become an indispensable solid-state light source for indoor and outdoor illumination [1,2,3,4]. Xing Chen et al [12] investigated different volume fractions of silicone/phosphor composites by tensile experiment and simulation. Different This volume fractions of silicone/phosphor composites by tensile experiment and the mechanical response of the composite during thermal cycling, load/unload tests are a necessary simulation. The mechanical behaviors of silicone/phosphor composites are LED compression products, bonding are The used finite for electrical interconnection, are embedded obtained byInboth and wires, tensilewhich testing. Thethermal siliconecycle matrix is simulated with the neo-Hookean expands with temperature change This change could cause fatigue cracking in bonding wire. The cohesive zone material model is used to simulate the cohesive order to study the mechanical response of the composite during thermal cycling, load/unload tests strength of the interface between silicone and phosphor.
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