Signify Holding B.v.

Arie Jan Hovestad

Jianghong Yu

Paul Dijkstra

Daiyu Hayashi

Michiel Van Der Meer

Methods and apparatus are provided for ultraviolet (UV) water purification, comprising UV-C LED modules having improved light extraction efficiency. UV-C LED dies () are solidly coupled to associated translucent output windows (), such that light is transmitted directly from light-emitting surface(s) of the dies () to output window(s) () of the LED package&#x2014;without propagation across interstitial air gaps. Gas-to-solid (and solid-to-gas) light transition boundaries are thus eliminated, significantly reducing the amount of light lost through inter-medium boundary reflection, and thereby increasing efficiency of light extraction.

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Eindhoven, Netherlands

Arie Jan Hovestad