The influence of phosphor particles on the water transport in optical silicones for LEDs

A. Herrmann; S. J.F. Erich; L.G.J. van der Ven; H.P. Huinink; Willem van Driel; M van Soestbergen; A Mavinkurve; Francois De Buyl; Arjan Mol; O. C.G. Adan

doi:10.1016/j.omx.2020.100047

The influence of phosphor particles on the water transport in optical silicones for LEDs

A. Herrmann, S. J.F. Erich, L.G.J. van der Ven, H.P. Huinink, Willem van Driel, M van Soestbergen, A Mavinkurve, Francois De Buyl, Arjan Mol, O. C.G. Adan

Electronic Components, Technology and Materials

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Abstract

The reliability of LEDs decreases in moist environments. One potential gateway of moisture ingress, reducing the product lifetime is the lens. In white LEDs, phosphor particles are embedded into the optical silicone of the lens to convert the blue light emitted by the diode down in frequency and achieve a light output that appears white. In this study, the influence of these phosphor particles on the moisture sorption, permeation and diffusion in optical silicones is investigated by comparing two silicone resins that are commonly used in LEDs, both with and without the addition of phosphor particles. The results of two methods are compared: the wet-cup method and a gravimetric approach of dynamic vapour sorption (DVS). Diffusion coefficients between 20 and 75 °C are reported as well as sorption isotherms, activation energy and sorption enthalpy. It is concluded that the addition of phosphor particles only has a very small impact on the moisture transport properties of the silicones.

Original language	English
Article number	100047
Number of pages	8
Journal	Optical Materials: X
Volume	6
DOIs	https://doi.org/10.1016/j.omx.2020.100047
Publication status	Published - 2020

Keywords

LED
Diffusion
Moisture transport
Silicone
Phosphor particles
Dynamic vapour sorption (DVS)

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10.1016/j.omx.2020.100047

1-s2.0-S2590147820300012-mainFinal published version, 1.57 MBLicence: CC BY-NC-ND

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title = "The influence of phosphor particles on the water transport in optical silicones for LEDs",

abstract = "The reliability of LEDs decreases in moist environments. One potential gateway of moisture ingress, reducing the product lifetime is the lens. In white LEDs, phosphor particles are embedded into the optical silicone of the lens to convert the blue light emitted by the diode down in frequency and achieve a light output that appears white. In this study, the influence of these phosphor particles on the moisture sorption, permeation and diffusion in optical silicones is investigated by comparing two silicone resins that are commonly used in LEDs, both with and without the addition of phosphor particles. The results of two methods are compared: the wet-cup method and a gravimetric approach of dynamic vapour sorption (DVS). Diffusion coefficients between 20 and 75 °C are reported as well as sorption isotherms, activation energy and sorption enthalpy. It is concluded that the addition of phosphor particles only has a very small impact on the moisture transport properties of the silicones.",

keywords = "LED, Diffusion, Moisture transport, Silicone, Phosphor particles, Dynamic vapour sorption (DVS)",

author = "A. Herrmann and Erich, {S. J.F.} and {van der Ven}, L.G.J. and H.P. Huinink and {van Driel}, Willem and {van Soestbergen}, M and A Mavinkurve and {De Buyl}, Francois and Arjan Mol and Adan, {O. C.G.}",

year = "2020",

doi = "10.1016/j.omx.2020.100047",

language = "English",

volume = "6",

journal = "Optical Materials: X",

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T1 - The influence of phosphor particles on the water transport in optical silicones for LEDs

AU - Herrmann, A.

AU - Erich, S. J.F.

AU - van der Ven, L.G.J.

AU - Huinink, H.P.

AU - van Driel, Willem

AU - van Soestbergen, M

AU - Mavinkurve, A

AU - De Buyl, Francois

AU - Mol, Arjan

AU - Adan, O. C.G.

PY - 2020

Y1 - 2020

N2 - The reliability of LEDs decreases in moist environments. One potential gateway of moisture ingress, reducing the product lifetime is the lens. In white LEDs, phosphor particles are embedded into the optical silicone of the lens to convert the blue light emitted by the diode down in frequency and achieve a light output that appears white. In this study, the influence of these phosphor particles on the moisture sorption, permeation and diffusion in optical silicones is investigated by comparing two silicone resins that are commonly used in LEDs, both with and without the addition of phosphor particles. The results of two methods are compared: the wet-cup method and a gravimetric approach of dynamic vapour sorption (DVS). Diffusion coefficients between 20 and 75 °C are reported as well as sorption isotherms, activation energy and sorption enthalpy. It is concluded that the addition of phosphor particles only has a very small impact on the moisture transport properties of the silicones.

AB - The reliability of LEDs decreases in moist environments. One potential gateway of moisture ingress, reducing the product lifetime is the lens. In white LEDs, phosphor particles are embedded into the optical silicone of the lens to convert the blue light emitted by the diode down in frequency and achieve a light output that appears white. In this study, the influence of these phosphor particles on the moisture sorption, permeation and diffusion in optical silicones is investigated by comparing two silicone resins that are commonly used in LEDs, both with and without the addition of phosphor particles. The results of two methods are compared: the wet-cup method and a gravimetric approach of dynamic vapour sorption (DVS). Diffusion coefficients between 20 and 75 °C are reported as well as sorption isotherms, activation energy and sorption enthalpy. It is concluded that the addition of phosphor particles only has a very small impact on the moisture transport properties of the silicones.

KW - LED

KW - Diffusion

KW - Moisture transport

KW - Silicone

KW - Phosphor particles

KW - Dynamic vapour sorption (DVS)

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U2 - 10.1016/j.omx.2020.100047

DO - 10.1016/j.omx.2020.100047

M3 - Article

SN - 2590-1478

VL - 6

JO - Optical Materials: X

JF - Optical Materials: X

M1 - 100047

ER -

The influence of phosphor particles on the water transport in optical silicones for LEDs

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Keywords

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