The influence of phosphor particles on the water transport in optical silicones for LEDs
| Autor: | Johannes M. C. Mol, L.G.J. van der Ven, HP Henk Huinink, Ocg Olaf Adan, A. Herrmann, W.D. van Driel, M. van Soestbergen, S.J.F. Erich, F. De Buyl, A. Mavinkurve |
|---|---|
| Přispěvatelé: | Transport in Permeable Media, Physical Chemistry, Thermo-Chemical Materials Lab, EIRES Systems for Sustainable Heat |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:Applied optics. Photonics
Materials science General Computer Science Phosphor Phosphor particles Dynamic vapour sorption (DVS) law.invention Diffusion chemistry.chemical_compound Silicone law lcsh:QC350-467 Electrical and Electronic Engineering Water transport Moisture transport Moisture LED lcsh:TA1501-1820 Sorption Permeation Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry Chemical engineering Gravimetric analysis lcsh:Optics. Light Light-emitting diode |
| Zdroj: | Optical Materials: X, Vol 6, Iss, Pp-(2020) Optical Materials: X, 6:100047. Elsevier Optical Materials: X, 6 |
| ISSN: | 2590-1478 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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