# US 10,121,941 B2 · Light source device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,121,941 B2 - Document ID: US10121941B2 - Status: Granted - Kind: B2 - Application number: 15/277,498 - Filed: 2016-09-27 - Published: 2017-03-30 - Granted: 2018-11-06 - Earliest claimed: 2015-09-30 - Assignees: Nichia Corporation - Applicants: Nichia Corporation - Inventors: Daisuke Iwakura; Masaki Hayashi; Shoji Hosokawa; Yusaku Achi - Web page: https://patentgrep.com/patent/US10121941B2 ## CPC - H10H 20/851: Wavelength conversion means - H10H 20/84: Coatings, e.g. passivation layers or antireflective coatings - G02B 6/0031: {Reflecting element, sheet or layer} - G02B 6/0073: {Light emitting diode [LED]} - G02F 1/133603: {with LEDs} - G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light} - G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side} - G02F 1/133624: {characterised by their spectral emissions} - H10H 20/852: Encapsulations - H10W 90/756: {between a chip and a stacked lead frame, conducting package substrate or heat sink} - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A light source device having: a blue light emitting element that emits blue light having an emission peak in a wavelength region of 440 nm to 460 nm; a green phosphor that absorbs part of the blue light emitted by the blue light emitting element and thereby emits green light having an emission peak in a wavelength region of 500 nm to 575 nm; a red phosphor that absorbs at least one of part of the blue light emitted by the blue light emitting element and part of the green light emitted by the green phosphor, and thereby emits red light having an emission peak in a wavelength region of 600 nm to 690 nm; and an absorbent containing neodymium fluoride that absorbs part of the green light and part of the red light. ## Claims ### Claim 1 A light source device comprising: (i) a blue light emitting element that emits blue light having an emission peak in a wavelength region of 440 nm to 460 nm; and (ii) a light-transmissive member that encapsulates the blue light emitting element and contains: (a) a green phosphor that absorbs part of the blue light emitted by the blue light emitting element and thereby emits green light having an emission peak in a wavelength region of 500 nm to 575 nm; (b) a red phosphor that absorbs at least one of part of the blue light emitted by the blue light emitting element and part of the green light emitted by the green phosphor, and thereby emits red light having an emission peak in a wavelength region of 600 nm to 690 nm; and (c) an absorbent containing neodymium fluoride that absorbs part of the green light and part of the red light, wherein the content ratio of the absorbent is 0.1 mass % to 15.0 mass % with respect to a total mass of the light-transmissive member. ### Claim 2 (depends on 1) A light source device as set forth in claim 1, wherein the absorbent is composed of a crystalline compound. ### Claim 3 (depends on 1) A light source device as set forth in claim 1, wherein the green phosphor contains at least one selected from the group consisting of a sulfide phosphor, an oxinitride phosphor, and an oxide phosphor. ### Claim 4 (depends on 1) A light source device as set forth in claim 1, wherein the red phosphor contains at least one selected from the group consisting of a fluoride phosphor, a nitride phosphor, an oxinitride phosphor, and a sulfide phosphor. ### Claim 5 (depends on 1) A light source device as set forth in claim 1, wherein the green phosphor has an emission peak in a wavelength region of 520 nm to 550 nm. ### Claim 6 (depends on 1) A light source device as set forth in claim 1, wherein the red phosphor has an emission peak in a wavelength region of 620 nm to 670 nm. ### Claim 7 (depends on 1) A light source device as set forth in claim 1, wherein the absorbent contains a composition having the formula: Nd1-xRxF3, wherein R is a rare earth element other than Nd, and wherein 0≤x<1. ### Claim 8 (depends on 1) A light source device as set forth in claim 1, wherein, when an emission intensity at an emission peak of the blue light emitting element is taken as 1, an emission intensity at an emission peak of the green phosphor is 0.15 to 0.5 and an emission intensity at an emission peak of the red phosphor is 0.1 to 2.5. ### Claim 9 A light source device, comprising: (i) a blue light emitting element that emits blue light having an emission peak in a wavelength region of 440 nm to 460 nm; (ii) a first light-transmissive member that encapsulates the blue light emitting element and contains: (a) a green phosphor that absorbs part of the blue light emitted by the blue light emitting element and thereby emits green light having an emission peak in a wavelength region of 500 nm to 575 nm; and (b) a red phosphor that absorbs at least one of part of the blue light emitted by the blue light emitting element and part of the green light emitted by the green phosphor, and thereby emits red light having an emission peak in a wavelength region of 600 nm to 690 nm; and (iii) a second light-transmissive member that covers the first light-transmissive member and contains an absorbent containing neodymium fluoride that absorbs part of the green light and part of the red light. ### Claim 10 (depends on 9) A light source device as set forth in claim 9, wherein the content ratio of the absorbent is 0.1 mass % to 15.0 mass % with respect to a total mass of the second light-transmissive member. ### Claim 11 (depends on 9) A light source device as set forth in claim 9, wherein, when an emission intensity at an emission peak of the blue light emitting element is taken as 1, an emission intensity at an emission peak of the green phosphor is 0.15 to 0.5 and an emission intensity at an emission peak of the red phosphor is 0.1 to 2.5. ### Claim 12 A light source device, comprising: (i) a blue light emitting element that emits blue light having an emission peak in a wavelength region of 440 nm to 460 nm; (ii) a green phosphor that absorbs part of the blue light emitted by the blue light emitting element and thereby emits green light having an emission peak in a wavelength region of 500 nm to 575 nm; (iii) a red phosphor that absorbs at least one of part of the blue light emitted by the blue light emitting element and part of the green light emitted by the green phosphor, and thereby emits red light having an emission peak in a wavelength region of 600 nm to 690 nm; and (iv) a light diffusion plate containing an absorbent containing neodymium fluoride that absorbs part of the green light and part of the red light and having: (a) a first principal surface into which a mixture of the blue light, the green light, and the red light enters; and (b) a second principal surface from which the mixture of the blue light, the green light, and the red light emerges. ### Claim 13 (depends on 12) A light source device as set forth in claim 12, wherein the content ratio of the absorbent is 0.1 mass % to 15.0 mass % with respect to a total mass of the light diffusion plate. ### Claim 14 (depends on 12) A light source device as set forth in claim 12, wherein, when an emission intensity at an emission peak of the blue light emitting element is taken as 1, an emission intensity at an emission peak of the green phosphor is 0.15 to 0.5 and an emission intensity at an emission peak of the red phosphor is 0.1 to 2.5. ### Claim 15 A light source device, comprising: (i) a blue light emitting element that emits blue light having an emission peak in a wavelength region of 440 nm to 460 nm; (ii) a green phosphor that absorbs part of the blue light emitted by the blue light emitting element and thereby emits green light having an emission peak in a wavelength region of 500 nm to 575 nm; (iii) a red phosphor that absorbs at least one of part of the blue light emitted by the blue light emitting element and part of the green light emitted by the green phosphor, and thereby emits red light having an emission peak in a wavelength region of 600 nm to 690 nm; and (iv) a light guide plate containing an absorbent containing neodymium fluoride that absorbs part of the green light and part of the red light and having: (a) a side surface into which a mixture of the blue light, the green light, and the red light enters; and (b) at least one principal surface from which the mixture of the blue light, the green light, and the red light emerges. ### Claim 16 (depends on 15) A light source device as set forth in claim 15, wherein the content ratio of the absorbent is 0.1 mass % to 15.0 mass % with respect to a total mass of the light guide plate. ### Claim 17 (depends on 15) A light source device as set forth in claim 15, wherein, when an emission intensity at an emission peak of the blue light emitting element is taken as 1, an emission intensity at an emission peak of the green phosphor is 0.15 to 0.5 and an emission intensity at an emission peak of the red phosphor is 0.1 to 2.5.