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

A. Herrmann (Corresponding author), S. J.F. Erich, L. G.J. van der Ven, H. P. Huinink, W. D. van Driel, M. van Soestbergen, A. Mavinkurve, F. De Buyl, J. M.C. Mol, O. C.G. Adan

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

Samenvatting

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.

Originele taal-2Engels
Artikelnummer100047
Aantal pagina's8
TijdschriftOptical Materials: X
Volume6
DOI's
StatusGepubliceerd - mei 2020

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