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JUMET, Belgium

Nakamura N.,Asahi Glass Co. | Domercq B.,European R and nter | Billet S.,European R and nter | Roquiny P.,AGC Inc | And 5 more authors.
Digest of Technical Papers - SID International Symposium | Year: 2013

An out-coupling technology using high refractive index glass scattering layer was established. Out-coupling efficiency of 2.1 times higher than reference was obtained by the light-scattering substrate with white OLED. To apply this technology to current production lines of OLED panels, cost-cutting structure and processes for Gen. 2.5 were also developed. We also show the guideline for OLED stacks on the developed substrates. © 2013 Society for Information Display.

Ruellan A.,CNRS Contacts and Structural Mechanics Laboratory | Ruellan A.,CNRS Laboratory for Materials: Engineering and Science | Ruellan A.,European R and nter | Ville F.,CNRS Contacts and Structural Mechanics Laboratory | And 4 more authors.
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology | Year: 2014

Among prevalent tribological failures, notably in rolling element bearings for wind turbines, an unusual rolling/sliding contact fatigue failure mode has been identified as white etching cracks. White etching cracks are broad subsurface three-dimensional branching crack networks bordered by white etching microstructure, eventually leading to flaking. Reproduction of the failure mode on standard rolling element bearings test rigs has not been mastered yet except with artificial hydrogen charging. Even though these failures have been reported for several decades, there is no evident common denominator in different occurrences. Hence, initiation and propagation mechanisms are not yet fully understood in application. Analyses of the contact conditions of a standard rolling element bearings test rig reproducing white etching cracks on standard and hydrogen precharged inner rings reveal that hydrogen charging seems to modify the white etching cracks initiation mechanism. Based on fractographs, serial sectioning, and scanning electron microscopic analyses, surface initiation and propagation mechanisms are proposed, including influent drivers and possible preventive techniques. © IMechE 2014 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.

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