# US 2016/0260930 A1 · Light-emitting element, light-emitting device, electronic device, and lighting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0260930 A1 - Document ID: US20160260930A1 - Status: Published application - Kind: A1 - Application number: 15/155,134 - Filed: 2016-05-16 - Published: 2016-09-08 - Earliest claimed: 2014-08-08 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Satoshi SEO; Toshiki SASAKI; Nobuharu OHSAWA - Web page: https://patentgrep.com/patent/US20160260930A1 ## CPC - H10K 59/351: {comprising more than three subpixels, e.g. red-green-blue-white [RGBW]} - H10K 50/11: characterised by the electroluminescent [EL] layers - H10K 50/121: {for assisting energy transfer, e.g. sensitization} - H10K 50/13: comprising stacked EL layers within one EL unit - H10K 50/131: {with spacer layers between the electroluminescent layers} - H10K 59/35: comprising red-green-blue [RGB] subpixels - H10K 59/38: comprising colour filters or colour changing media [CCM] - H10K 59/40: OLEDs integrated with touch screens - H10K 59/80517: {Multilayers, e.g. transparent multilayers} - H10K 59/876: {comprising a resonant cavity structure, e.g. Bragg reflector pair} - H10K 2101/10: Triplet emission - H10K 2101/20: Delayed fluorescence emission - H10K 2102/00: Constructional details relating to the organic devices covered by this subclass - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A novel light-emitting device is provided. A novel light-emitting device with high emission efficiency, low power consumption, and small viewing angle dependence of chromaticity is provided. The light-emitting device includes at least one light-emitting element and one optical element. A spectrum of light emitted from the light-emitting element through the optical element in a range of greater than 0° and less than or equal to 70° with respect to a normal vector of the light-emitting element has a first local maximum value in a wavelength range of greater than or equal to 400 nm and less than 480 nm and a second local maximum value located on a longer wavelength side than the first local maximum value. The intensity ratio of the second local maximum value to the first local maximum value is less than or equal to 15%. ## Claims ### Claim 1 (canceled) ### Claim 2 A light-emitting device comprising at least a light-emitting element and an optical element, wherein a spectrum of light emitted from the light-emitting element through the optical element in a range of greater than 0° and less than or equal to 70° with respect to a normal vector of the light-emitting element has a first local maximum value in a wavelength range of greater than or equal to 400 nm and less than 480 nm and a second local maximum value located on a longer wavelength side than the second local maximum value, and wherein an intensity ratio of the second local maximum value to the first local maximum value is less than or equal to 15%. ### Claim 3 (depends on 2) The light-emitting device according to claim 2, wherein the optical element has a region whose transmittance with respect to light with a wavelength of greater than or equal to 400 nm and less than 480 nm is greater than or equal to 50% and a region whose transmittance with respect to light with a wavelength of greater than or equal to 530 nm and less than or equal to 680 nm is less than or equal to 20%. ### Claim 4 (depends on 2) The light-emitting device according to claim 2, wherein the light-emitting element comprises: a first electrode and a second electrode; and a first light emitting layer and a second light emitting layer between the first electrode and the second electrode, wherein the first light emitting layer is configured to emit light by triplet-triplet annihilation, wherein the second light emitting layer is configured to emit light by exciplex-triplet energy transfer. ### Claim 5 (depends on 2) The light-emitting device according to claim 2, wherein the light-emitting element comprises: a first electrode and a second electrode; and a first light emitting layer and a second light emitting layer between the first electrode and the second electrode, wherein the first light emitting layer comprises a fluorescent material and a first host material, and wherein the second light emitting layer comprises a phosphorescent material, a second host material, and an assist material. ### Claim 6 (depends on 2) The light-emitting device according to claim 2, wherein the light-emitting element comprises: a first electrode and a second electrode; and a first light emitting layer and a second light emitting layer between the first electrode and the second electrode, wherein the first light emitting layer comprises a fluorescent material, and wherein the second light emitting layer comprises a thermally activated delayed fluorescence material. ### Claim 7 A light-emitting device comprising first to third light-emitting elements and first to third optical elements, wherein a spectrum of light emitted from the first light-emitting element through the first optical element has a first local maximum value in a wavelength range of greater than or equal to 600 nm and less than or equal to 740 nm, wherein a spectrum of light emitted from the second light-emitting element through the second optical element has a second local maximum value in a wavelength range of greater than or equal to 480 nm and less than 550 nm, wherein a spectrum of light emitted from the third light-emitting element through the third optical element has a third local maximum value in a wavelength range of greater than or equal to 400 nm and less than 480 nm, wherein at least one of the first to third fourth-emitting elements comprises: a first electrode and a second electrode; and a first light emitting layer and a second light emitting layer between the first electrode and the second electrode, wherein the first light emitting layer is configured to emit light by triplet-triplet annihilation, and wherein the second light emitting layer is configured to emit light by exciplex-triplet energy transfer. ### Claim 8 (depends on 7) The light-emitting device according to claim 7, wherein the spectrum of the light emitted from the third light-emitting element through the third optical element in a range of greater than 0° and less than or equal to 70° with respect to a normal vector of the third light-emitting element has the third local maximum value and a fourth local maximum value located on a longer wavelength side than the third local maximum value, and wherein an intensity ratio of the fourth local maximum value to the third local maximum value is less than or equal to 15%. ### Claim 9 (depends on 8) The light-emitting device according to claim 8, wherein the first optical element has a region whose transmittance with respect to light with a wavelength of greater than or equal to 570 nm and less than or equal to 800 nm is greater than or equal to 50%, wherein the second optical element has a region whose transmittance with respect to light with a wavelength of greater than or equal to 480 nm and less than 570 nm is greater than or equal to 50%, and wherein the third optical element has a region whose transmittance with respect to light with a wavelength of greater than or equal to 400 nm and less than 480 nm is greater than or equal to 50% and a region whose transmittance with respect to light with a wavelength of greater than or equal to 530 nm and less than or equal to 680 nm is less than or equal to 20%. ### Claim 10 (depends on 7) The light-emitting device according to claim 7, wherein the first light emitting layer comprises a fluorescent material and a first host material, and wherein the second light emitting layer comprises a phosphorescent material, a second host material, and an assist material. ### Claim 11 (depends on 7) The light-emitting device according to claim 7, wherein the first light emitting layer comprises a fluorescent material, and wherein the second light emitting layer comprises a thermally activated delayed fluorescence material. ### Claim 12 A light-emitting device comprising first to fourth light-emitting elements and first to third optical elements, wherein a spectrum of light emitted from the first light-emitting element through the first optical element has a first local maximum value in a wavelength range of greater than or equal to 600 nm and less than or equal to 740 nm, wherein a spectrum of light emitted from the second light-emitting element through the second optical element has a second local maximum value in a wavelength range of greater than or equal to 480 nm and less than 550 nm, wherein a spectrum of light emitted from the third light-emitting element through the third optical element has a third local maximum value in a wavelength range of greater than or equal to 400 nm and less than 480 nm, wherein a spectrum of light emitted from the fourth light-emitting element has a fourth local maximum value in a wavelength range of greater than or equal to 550 nm and less than 600 nm, wherein at least one of the first to fourth light-emitting elements comprises: a first electrode and a second electrode; and a first light emitting layer and a second light emitting layer between the first electrode and the second electrode, wherein the first light emitting layer is configured to emit light by triplet-triplet annihilation, and wherein the second light emitting layer is configured to emit light by exciplex-triplet energy transfer. ### Claim 13 (depends on 12) The light-emitting device according to claim 12, wherein the spectrum of the light emitted from the third light-emitting element through the third optical element in a range of greater than 0° and less than or equal to 70° with respect to a normal vector of the third light-emitting element has the third local maximum value and a fifth local maximum value located on a longer wavelength side than the third local maximum value, and wherein an intensity ratio of the fifth local maximum value to the third local maximum value is less than or equal to 15%. ### Claim 14 (depends on 13) The light-emitting device according to claim 13, wherein the first optical element has a region whose transmittance with respect to light with a wavelength of greater than or equal to 570 nm and less than or equal to 800 nm is greater than or equal to 50%, wherein the second optical element has a region whose transmittance with respect to light with a wavelength of greater than or equal to 480 nm and less than 570 nm is greater than or equal to 50%, and wherein the third optical element has a region whose transmittance with respect to light with a wavelength of greater than or equal to 400 nm and less than 480 nm is greater than or equal to 50% and a region whose transmittance with respect to light with a wavelength of greater than or equal to 530 nm and less than or equal to 680 nm is less than or equal to 20%. ### Claim 15 (depends on 12) The light-emitting device according to claim 12, further comprising a fourth optical element, through which the light is emitted from the fourth light-emitting element. ### Claim 16 (depends on 12) The light-emitting device according to claim 12, wherein the first light emitting layer comprises a fluorescent material and a first host material, and wherein the second light emitting layer comprises a phosphorescent material, a second host material, and an assist material. ### Claim 17 (depends on 12) The light-emitting device according to claim 12, wherein the first light emitting layer comprises a fluorescent material, and wherein the second light emitting layer comprises a thermally activated delayed fluorescence material.