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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the Physical Activity for Health Group based within the School of Psychological Sciences & Health. Research here seeks to better understand how and why physical activity improves health, gain a better understanding of the amount, intensity, and type of physical activity needed for health benefits, and evaluate the effect of interventions to promote physical activity.

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Polymer microlens arrays applicable to AllnGaN ultraviolet micro-light-emitting diodes

Jeon, C.W. and Gu, E. and Liu, C. and Girkin, J.M. and Dawson, M.D. (2005) Polymer microlens arrays applicable to AllnGaN ultraviolet micro-light-emitting diodes. IEEE Photonics Technology Letters, 17 (9). pp. 1887-1889. ISSN 1041-1135

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Abstract

We report on the fabrication of high-optical-quality microlens arrays based on ultraviolet (UV)-curable polymer adhesive. The lenses are suitable, amongst other applications, for high-transmission and projection of the output of UV micropixellated light-emitting diodes. The microlenses were fabricated using a resist-reflow technique with reactive ion etching. An O/sub 2/--CF/sub 4/ etch-gas chemistry, where atomic fluorine eliminates the carbon-related polymer residue at the etch front effectively, resulted in etch rates of 1.4 /spl mu/m per minute for the polymer. Spherical microlenses of root mean square surface roughness 3 nm were obtained.