# US 2014/0151729 A1 · Led lighting devices with quantum dot glass containment plates > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0151729 A1 - Document ID: US20140151729A1 - Status: Published application - Kind: A1 - Application number: 13/828,169 - Filed: 2013-03-14 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Corning Incorporated - Applicants: Corning Incorporated - Inventors: Timothy James Orsley; William Richard Trutna - Web page: https://patentgrep.com/patent/US20140151729A1 ## CPC - H10H 20/8514: {characterised by their shape, e.g. plate or foil} - H10H 20/8513: {having two or more wavelength conversion materials} - H10W 74/00: Encapsulations, e.g. protective coatings - 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 A lighting device is provided comprising a chip-on-board (COB) light emitting diode (LED) light source, a light source encapsulant, a quantum dot distributed color conversion medium, and a quantum dot glass containment plate. The COB LED light source comprises at least one LED and defines a light source encapsulant cavity in which the light source encapsulant is distributed over the LED. The quantum dot glass containment plate is positioned over the light source encapsulant cavity and contains a quantum dot distributed color conversion medium. The distributed color conversion medium comprises a quantum dot structure and is distributed in two dimensions over an emission field of the lighting device within the quantum dot glass containment plate. ## Claims ### Claim 1 A lighting device comprising a chip-on-board (COB) light emitting diode (LED) light source, a light source encapsulant, a quantum dot distributed color conversion medium, and a quantum dot glass containment plate, wherein: the COB LED light source comprises at least one LED and defines a light source encapsulant cavity in which the light source encapsulant is distributed over the LED; the quantum dot glass containment plate is positioned over the light source encapsulant cavity and contains the distributed color conversion medium; and the distributed color conversion medium comprises a quantum dot structure and is distributed in two dimensions over an emission field of the lighting device within the quantum dot glass containment plate. ### Claim 2 (depends on 1) The lighting device as claimed in claim 1 wherein: the quantum dot glass containment plate comprises a glass frame; and the quantum dot structure is contained within an interior volume of the glass frame. ### Claim 3 (depends on 1) The lighting device as claimed in claim 1 wherein: the quantum dot glass containment plate comprises opposing glass panels that are sealed at complementary edges to define an interior volume; and the quantum dot structure is contained within the interior volume of the quantum dot glass containment plate. ### Claim 4 (depends on 1) The lighting device as claimed in claim 1 wherein the quantum dot glass containment plate comprises a variety of quantum dot sizes that are blended to obtain a particular color. ### Claim 5 (depends on 1) The lighting device as claimed in claim 1 wherein: the light source encapsulant comprises a primary distributed color conversion medium; the color conversion medium of the quantum dot glass containment plate defines a supplemental emission field of the lighting device; and the emission field defined by the primary distributed color conversion medium is spatially congruent with, but spectrally distinct from, the supplemental emission field defined by the quantum dot glass containment plate. ### Claim 6 (depends on 5) The lighting device as claimed in claim 5 wherein: the light source encapsulant comprises silicone; and the primary distributed color conversion medium comprises phosphor. ### Claim 7 (depends on 5) The lighting device as claimed in claim 5 wherein an emission spectrum of the emission field defined by the quantum dot glass containment plate adds optical warmth to an emission spectrum of the emission field defined by the primary distributed phosphor color conversion medium of the light source encapsulant. ### Claim 8 (depends on 1) The lighting device as claimed in claim 1 wherein: the lighting device comprises a primary glass containment plate comprising a primary distributed color conversion medium; the color conversion medium of the quantum dot glass containment plate defines a supplemental emission field of the lighting device; and the emission field defined by the distributed color conversion medium is spatially congruent with, but spectrally distinct from, the supplemental emission field defined by the quantum dot plate. ### Claim 9 (depends on 8) The lighting device as claimed in claim 8 wherein: the primary glass containment plate comprises a glass matrix; and the primary distributed color conversion medium comprises a phosphor distributed in the glass matrix. ### Claim 10 (depends on 8) The lighting device as claimed in claim 8 wherein: the glass containment plate comprises a glass frame; and the primary distributed color conversion medium comprises a quantum dot structure contained within an interior volume of the glass frame. ### Claim 11 (depends on 8) The lighting device as claimed in claim 8 wherein: the primary distributed color conversion medium comprises a quantum dot structure; the primary glass containment plate comprises opposing glass panels that are sealed at complementary edges to define an interior volume; and the quantum dot structure is contained within the interior volume of the primary glass containment plate. ### Claim 12 (depends on 8) The lighting device as claimed in claim 8 wherein a bonding layer is provided between the primary glass containment plate and the quantum dot glass containment plate to permit separate manufacture and subsequent bonding of the primary glass containment plate and the quantum dot glass containment plate. ### Claim 13 (depends on 8) The lighting device as claimed in claim 8 wherein the primary glass containment plate comprises a variety of quantum dot sizes that are blended to obtain a particular color. ### Claim 14 (depends on 1) The lighting device as claimed in claim 1 wherein: the COB LED light source comprises a thermal heat sink framework; the light source encapsulant is free of any distributed color conversion medium; the light source encapsulant comprises silicone; the quantum dot glass containment plate is positioned over the light source encapsulant cavity; the light source encapsulant is distributed over the LED at a thickness that is sufficient to encapsulate the LED and define encapsulant thermal conduction paths TPE extending through the light source encapsulant to the thermal heat sink framework from the distributed color conversion medium of the quantum dot glass containment plate; and the thickness of the light source encapsulant is such that the thermal conduction paths TPE extend less than approximately 100 μm through the light source encapsulant. ### Claim 15 (depends on 14) The lighting device as claimed in claim 14 wherein the thickness of the light source encapsulant is such that the thermal conduction paths TPE extend less than approximately 50 μm through the light source encapsulant. ### Claim 16 (depends on 14) The lighting device as claimed in claim 14 wherein the thickness of the light source encapsulant is such that the thermal conduction paths TPE encounter a thermal resistance of less than approximately 15° C./W through the light source encapsulant. ### Claim 17 (depends on 14) The lighting device as claimed in claim 14 wherein the thickness of the light source encapsulant is such that the thermal conduction paths TPE encounter a thermal resistance of less than approximately 10° C./W through the light source encapsulant. ### Claim 18 A lighting device comprising a chip-on-board (COB) light emitting diode (LED) light source, a light source encapsulant, a quantum dot distributed color conversion medium, and a quantum dot glass containment plate, wherein: the COB LED light source comprises at least one LED and defines a light source encapsulant cavity in which the light source encapsulant is distributed over the LED; the quantum dot glass containment plate is positioned over the light source encapsulant cavity, and comprises opposing glass panels that are sealed at complementary edges to define an interior volume; the quantum dot distributed color conversion medium is contained within the interior volume of the quantum dot glass containment plate; the distributed color conversion medium comprises a quantum dot structure and is distributed in two dimensions over an emission field of the lighting device within the quantum dot glass containment plate; the light source encapsulant comprises a primary distributed color conversion medium; the color conversion medium of the quantum dot glass containment plate defines a supplemental emission field of the lighting device; and the emission field defined by the primary distributed color conversion medium is spatially congruent with, but spectrally distinct from, the supplemental emission field defined by the quantum dot glass containment plate.