# US 10,501,342 B2 · UV-C water purification device

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- Number: US 10,501,342 B2
- Document ID: US10501342B2
- Status: Granted
- Kind: B2
- Application number: 15/559,280
- Filed: 2016-03-10
- Published: 2018-03-29
- Granted: 2019-12-10
- Earliest claimed: 2015-03-20
- Assignees: Signify Holding B.V.
- Applicants: Signify Holding B.V.
- Inventors: Daiyu Hayashi; Jianghong Yu; Paul Dijkstra; Michiel Van Der Meer; Arie Jan Hovestad
- Web page: https://patentgrep.com/patent/US10501342B2

## CPC

- C02F 1/325: {Irradiation devices or lamp constructions}
- C02F 2201/3222: Units using UV-light emitting diodes [LED]
- C02F 2201/3227: Units with two or more lamps
- C02F 2201/3228: Units having reflectors, e.g. coatings, baffles, plates, mirrors
- C02F 2303/04: Disinfection
- H10H 20/854: characterised by their material, e.g. epoxy or silicone resins
- H10H 20/855: Optical field-shaping means, e.g. lenses
- H10W 74/00: Encapsulations, e.g. protective coatings
- H10W 90/00: Package configurations
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

Methods and apparatus are provided for ultraviolet (UV) water purification, comprising UV-C LED modules having improved light extraction efficiency. UV-C LED dies (12) are solidly coupled to associated translucent output windows (14), such that light is transmitted directly from light-emitting surface(s) of the dies (12) to output window(s) (14) of the LED package—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.

## Claims

### Claim 1

A UV-C water purification device, comprising:
one or more UV-C LED modules for administering UV-C light to a body of water, each module comprising:
one or more UV-C LED dies, each die having a bottom surface and a top surface, and
one or more UV-C-translucent window elements,
wherein each of the UV-C LED dies is at least partly embedded in a UV-C-translucent window element, and wherein each of the UV-C LED dies is solidly coupled against an associated UV-C-translucent window element, such that at least one of the bottom or top surfaces of the UV-C die is in optical communication with the associated UV-C-translucent window element, and wherein the one or more UV-C-translucent window elements comprise electrical tracks for delivering current to one or more terminals of the one or more UV-C LED dies, and wherein the one or more UV-C-translucent window elements is for transferring heat from the one or more UV-C LED dies,
wherein the UV-C water purification device further comprises a sealing layer disposed over either the top or bottom surface of the or each UV-C LED die, the sealing being UV-C light reflective.

### Claim 2 (depends on 1)

A UV-C water purification device as claimed in claim 1, wherein the one or more UV-C LED dies is a flipchip LED die.

### Claim 3 (depends on 1)

A UV-C water purification device as claimed in claim 1, wherein the bottom surface of the one or more UV-C LED dies comprises a surface of a die substrate, and wherein said bottom surface is in optical communication with the associated UV-C-translucent window.

### Claim 4 (depends on 1)

A UV-C water purification device as claimed in claim 1, wherein the one or more UV-C-translucent window elements comprises a translucent ceramic.

### Claim 5 (depends on 1)

A UV-C water purification device as claimed in claim 1, wherein the one or more UV-C LED modules comprises a water-resistant encapsulation.

### Claim 6 (depends on 1)

A UV-C water purification device as claimed in claim 1, further comprising an adhesive between each UV-C LED die and the associated UV-C-translucent window element.

### Claim 7

A method of producing a water purification device, comprising:
at least partially embedding each of one or more UV-C LED dies in one or more translucent window elements,
solidly coupling one or more UV-C LED dies against the one or more UV-C-translucent window elements, wherein the one or more UV-C-translucent window elements comprise electrical tracks for delivering current to one or more terminals of the one or more UV-C LED dies, each UV-C LED die having a bottom surface and a top surface, and the coupling being such that such that at least one of the bottom or top surfaces of each UV-C LED die is in optical communication with an associated UV-C-translucent window element, said coupling thereby generating one or more UV-C LED modules for administering UV-C light to a body of water, and
providing a sealing layer disposed over a surface of each of the one or more UV-C LED dies, the sealing being UV-C light reflective.