Publication: Analysis of discoloration and high accelerated testing of optical materials in led-based products
| datacite.subject.fos | oecd::Engineering and technology::Materials engineering::Materials engineering | |
| dc.contributor.author | Lim Fang Li | |
| dc.date.accessioned | 2025-06-11T06:59:16Z | |
| dc.date.available | 2025-06-11T06:59:16Z | |
| dc.date.issued | 2024-08-01 | |
| dc.description.abstract | The increasing demand for LED-based products highlights the importance to address the issue of discoloration in silicone encapsulants due to photodegradation and thermal aging. This research aims to mitigate these degradation phenomena by synthesizing iron-doped titanium dioxide (Fe/TiO2) particles using the sol-gel method, with varying parameters such as the molar ratio of Fe/TTIP, pH, and calcination temperature. The optimal Fe/TiO2 particles selected based on their ability to suppress photocatalytic activity, were incorporated into RTV silicone films via spin coating on polycarbonate substrates. Photodegradation of methylene blue was employed to evaluate the efficiency of the synthesized particles, and weathering test assessed the chromaticity and surface properties of the silicone films. Characterization techniques including FTIR, XRD, SEM, EDX, UV-Vis spectroscopy, colorimetry, optical microscopy, and thermogravimetric analysis were used to analyze the properties of the Fe/TiO2 particles and silicone films. After 500 hours of weathering, the findings revealed that silicone with 7.5% pH 5 500 ºC Fe/TiO2 film had the lowest degree of yellowness (1.03) and total colour difference (1.22). For optical microscopy analysis, silicone with optimal Fe/TiO2 film showed more obvious defect while TGA analysis shown that commercial TiO2 had weight loss of 4.726% had better thermal stability than Fe/TiO2 (6.471%). In conclusion. incorporating Fe/TiO2 into silicone films effectively reduced photodegradation, eliminating the discoloration but commercial TiO2 have better thermal stability, thus maintaining surface uniformity. | |
| dc.identifier.uri | https://erepo.usm.my/handle/123456789/22091 | |
| dc.language.iso | en | |
| dc.title | Analysis of discoloration and high accelerated testing of optical materials in led-based products | |
| dc.type | Resource Types::text::report::research report | |
| dspace.entity.type | Publication | |
| oairecerif.author.affiliation | Universiti Sains Malaysia |