# US 2022/0285643 A1 · Light-emitting device with improved light emission efficiency and display apparatus including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0285643 A1 - Document ID: US20220285643A1 - Status: Published application - Kind: A1 - Application number: 17/468,146 - Filed: 2021-09-07 - Published: 2022-09-08 - Earliest claimed: 2021-03-03 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Wonjae JOO; Hyun KOO; Ajeong CHOI - Web page: https://patentgrep.com/patent/US20220285643A1 ## CPC - H10K 50/19: Tandem OLEDs - H10K 50/13: comprising stacked EL layers within one EL unit - H10K 50/15: Hole transporting layers - H10K 50/16: Electron transporting layers - H10K 59/876: {comprising a resonant cavity structure, e.g. Bragg reflector pair} - H10K 59/878: {comprising reflective means} - H10K 59/35: comprising red-green-blue [RGB] subpixels - H10K 2102/351: {Thickness} - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A light-emitting device includes: a reflective layer; a first electrode provided on the reflective layer; a second electrode facing the first electrode; a first emission layer provided between the first electrode and the second electrode; a second emission layer provided between the first emission layer and the second electrode, and a first partial transmission mirror provided between the first emission layer and the second emission layer so that a first or higher order resonance mode is formed between the reflective layer and the first partial transmission mirror, and a second or higher order resonance mode is formed between the reflective layer and the second electrode. ## Claims ### Claim 1 A light-emitting device comprising: a reflective layer; a first electrode provided on the reflective layer; a second electrode facing the first electrode; a first emission layer provided between the first electrode and the second electrode; a second emission layer provided between the first emission layer and the second electrode, and a first partial transmission mirror provided between the first emission layer and the second emission layer so that a first or higher order resonance mode is formed between the reflective layer and the first partial transmission mirror, and a second or higher order resonance mode is formed between the reflective layer and the second electrode. ### Claim 2 (depends on 1) The light-emitting device of claim 1, wherein the first electrode comprises a transparent electrode and the second electrode comprises a partial transmission electrode that reflects a part of light and transmits another part of the light. ### Claim 3 (depends on 1) The light-emitting device of claim 1, wherein the reflective layer and the second electrode constitute a micro cavity having a resonance wavelength, and wherein the first partial transmission mirror is provided at a node of a light wave resonating within the micro cavity. ### Claim 4 (depends on 1) The light-emitting device of claim 1, wherein the first partial transmission mirror comprises silver (Ag), aluminum (Al), silver alloy, or aluminum alloy. ### Claim 5 (depends on 4) The light-emitting device of claim 4, wherein a thickness of the first partial transmission mirror is about 5 nm to about 30 nm. ### Claim 6 (depends on 5) The light-emitting device of claim 5, wherein a thickness of the second electrode is different from the thickness of the first partial transmission mirror. ### Claim 7 (depends on 1) The light-emitting device of claim 1, wherein the first emission layer comprises: a first hole transfer layer provided on the first electrode; a first organic emission material layer provided on the first hole transfer layer; and a first electron transfer layer provided on the first organic emission material layer, and wherein the second emission layer comprises: a second hole transfer layer provided on the first partial transmission mirror; a second organic emission material layer provided on the second hole transfer layer; and a second electron transfer layer provided on the second organic emission material layer. ### Claim 8 (depends on 1) The light-emitting device of claim 1, further comprising a transparent conductor layer on the first partial transmission mirror to face the second electrode. ### Claim 9 (depends on 1) The light-emitting device of claim 1, further comprising a charge generation layer provided between the first emission layer and the second emission layer. ### Claim 10 (depends on 1) The light-emitting device of claim 1, further comprising: a third emission layer provided between the second emission layer and the second electrode; and a second partial transmission mirror provided between the second emission layer and the third emission layer. ### Claim 11 (depends on 10) The light-emitting device of claim 10, wherein the first partial transmission mirror and the second partial transmission mirror are arranged so that a first order resonance mode is formed between the reflective layer and the first partial transmission mirror, a second order resonance mode is formed between the reflective layer and the second partial transmission mirror, and a third order resonance is formed between the reflective layer and the second electrode. ### Claim 12 (depends on 11) The light-emitting device of claim 11, wherein the reflective layer and the second electrode constitute a micro cavity having a resonance wavelength, wherein the first partial transmission mirror is provided at a first node of a light wave resonating in the micro cavity, and wherein the second partial transmission mirror is provided at a second node of the light wave resonating in the micro cavity. ### Claim 13 A light-emitting device comprising: a reflective layer; a first electrode on the reflective layer; a second electrode facing the first electrode; a phase correction layer provided between the first electrode and the second electrode; a first emission layer provided between the first electrode and the phase correction layer; a second emission layer provided between the phase correction layer and the second electrode; a first partial transmission mirror provided between the phase correction layer and the first emission layer; and a second partial transmission mirror provided between the phase correction layer and the second emission layer, wherein the first partial transmission mirror and the second partial transmission mirror are arranged such that a first or higher order resonance mode is formed between the reflective layer and the first partial transmission mirror, and a second or higher order resonance mode is formed between the reflective layer and the second electrode. ### Claim 14 (depends on 13) The light-emitting device of claim 13, wherein the first electrode comprises a transparent electrode and the second electrode comprises a partial transmission electrode that reflects a part of light and transmits another part of the light. ### Claim 15 (depends on 13) The light-emitting device of claim 13, wherein the reflective layer and the second electrode constitute a micro cavity having a resonance wavelength, and wherein the phase correction layer is located at a node of a light wave resonating within the micro cavity. ### Claim 16 (depends on 13) The light-emitting device of claim 13, wherein the reflective layer, the second electrode, the first partial transmission mirror, and the second partial transmission mirror cause a phase modulation greater than 180 degrees to occur with respect to light reflected by the reflective layer, the second electrode, the first partial transmission mirror, and the second partial transmission mirror. ### Claim 17 (depends on 13) The light-emitting device of claim 13, wherein the phase correction layer comprises a transparent conductive material. ### Claim 18 (depends on 17) The light-emitting device of claim 17, wherein a thickness of the phase correction layer is about 5 nm to about 150 nm. ### Claim 19 (depends on 13) The light-emitting device of claim 13, wherein each of the first partial transmission mirror and the second partial transmission mirror comprises silver (Ag), aluminum (Al), silver alloy, or aluminum alloy. ### Claim 20 (depends on 19) The light-emitting device of claim 19, wherein each of the first partial transmission mirror and the second partial transmission mirror has a thickness of about 5 nm to about 30 nm. ### Claim 21 (depends on 13) The light-emitting device of claim 13, wherein an optical distance between the reflective layer and the first partial transmission mirror is set so that a first or second order resonance mode is formed between the reflective layer and the first partial transmission mirror, and wherein an optical distance between the second partial transmission mirror and the second electrode is set so that the first or second order resonance mode is formed between the second partial transmission mirror and the second electrode. ### Claim 22 (depends on 13) The light-emitting device of claim 13, wherein the first emission layer comprises: a first hole transfer layer provided on the first electrode; a first organic emission material layer provided on the first hole transfer layer; and a first electron transfer layer provided on the first organic emission material layer, and wherein the second emission layer comprises: a second hole transfer layer provided on the second partial transmission mirror; a second organic emission material layer provided on the second hole transfer layer; and a second electron transfer layer provided on the second organic emission material layer. ### Claim 23 (depends on 22) The light-emitting device of claim 22, wherein the first organic emission material layer and the second organic emission material layer generate light of a same wavelength. ### Claim 24 (depends on 23) The light-emitting device of claim 23, wherein an optical distance between the reflective layer and the first partial transmission mirror is set so that a resonance mode is formed with respect to a wavelength of light generated from the first organic emission material layer, and wherein an optical distance between the second partial transmission mirror and the second electrode is set so that a resonance mode is formed with respect to a wavelength of light generated from the second organic emission material layer. ### Claim 25 (depends on 22) The light-emitting device of claim 22, wherein the first organic emission material layer generates light of a first wavelength, and wherein the second organic emission material layer generates light of a second wavelength different from the first wavelength. ### Claim 26 (depends on 25) The light-emitting device of claim 25, wherein an optical distance between the reflective layer and the first partial transmission mirror is set so that a resonance mode is formed with respect to the first wavelength, and wherein an optical distance between the second partial transmission mirror and the second electrode is set so that a resonance mode is formed with respect to the second wavelength. ### Claim 27 A display apparatus comprising: a plurality of pixels, wherein each of the plurality of pixels comprises: a reflective layer; a first electrode provided on the reflective layer; a second electrode facing the first electrode; a first emission layer provided between the first electrode and the second electrode; a second emission layer provided between the first emission layer and the second electrode; and a partial transmission mirror provided between the first emission layer and the second emission layer so that a first or higher order resonance mode is formed between the reflective layer and the partial transmission mirror, and a second or higher order resonance mode is formed between the reflective layer and the second electrode.