# US 10,873,009 B2 · Barrier layer functioned novel-structure ceramic converter materials and light emitting devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,009 B2 - Document ID: US10873009B2 - Status: Granted - Kind: B2 - Application number: 16/198,435 - Filed: 2018-11-21 - Published: 2020-05-21 - Granted: 2020-12-22 - Earliest claimed: 2018-11-21 - Assignees: OSRAM Opto Semiconductors GmbH - Applicants: OSRAM Opto Semiconductors GmbH - Inventors: Zhengbo Yu; Hiroaki Miyagawa - Web page: https://patentgrep.com/patent/US10873009B2 ## CPC - H10H 20/8512: {Wavelength conversion materials} - H10H 20/8514: {characterised by their shape, e.g. plate or foil} - H10H 20/8515: {not being in contact with the bodies} - H10H 20/8516: {having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer or wavelength conversion layer with a concentration gradient} - H10H 20/0361: {of wavelength conversion means} - H10H 20/825: containing nitrogen, e.g. GaN - H10H 20/8511: {characterised by their material, e.g. binder} - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS ## Abstract A ceramic wavelength converter assembly has a layered structure. The ceramic wavelength converter assembly includes two first layers having an undoped host material, or a doped host material, two second layers having a barrier material and being disposed between the two first layers and a third layer having an undoped host material, or a doped host material and being disposed between the two second layers. The two first layers include the undoped host material and the third layer includes the doped host material, or the two first layers include the doped host material and the third layer includes the undoped host material. ## Claims ### Claim 1 A ceramic wavelength converter assembly having a layered structure, the ceramic wavelength converter assembly comprising: two first layers comprising an undoped host material, or a doped host material; two second layers comprising a barrier material and being disposed between the two first layers; and a third layer comprising an undoped host material, or a doped host material and being disposed between the two second layers, wherein the two first layers comprise the undoped host material when the third layer comprises the doped host material, or wherein the two first layers comprise the doped host material when the third layer comprises the undoped host material. ### Claim 2 (depends on 1) The ceramic wavelength converter assembly of claim 1, wherein the two first layers comprise the undoped host material and the third layer comprises the doped host material. ### Claim 3 (depends on 1) The ceramic wavelength converter assembly of claim 1, wherein the doped host material is a phosphor. ### Claim 4 (depends on 1) The ceramic wavelength converter assembly of claim 1, wherein the barrier material is Al2O3. ### Claim 5 (depends on 1) The ceramic wavelength converter assembly of claim 1, wherein the undoped host material comprises a material selected from the group consisting of garnet, MgAl2O4, silicates, oxynitrides and nitrides. ### Claim 6 (depends on 1) The ceramic wavelength converter assembly of claim 1, wherein the undoped host material is garnet. ### Claim 7 (depends on 1) The ceramic wavelength converter assembly of claim 1, wherein the doped host material is doped with Ce, or Gd, or a combination thereof. ### Claim 8 (depends on 1) The ceramic wavelength converter assembly of claim 1, wherein the doped host material is doped with Ce. ### Claim 9 (depends on 1) The ceramic wavelength converter assembly of claim 1, wherein the doped host material is doped with at least one dopant in an amount of at least 0.8 at %. ### Claim 10 (depends on 1) The ceramic wavelength converter assembly of claim 1, wherein the doped host material is YAG:Ce. ### Claim 11 (depends on 1) The ceramic wavelength converter assembly of claim 1, wherein the undoped host material is YAG and the doped host material is YAG:Ce. ### Claim 12 (depends on 1) The ceramic wavelength converter assembly of claim 1, wherein the undoped host material is MgAl2O4. ### Claim 13 (depends on 1) The ceramic wavelength converter assembly of claim 1, wherein the undoped host material comprises silicates. ### Claim 14 (depends on 1) The ceramic wavelength converter assembly of claim 1, wherein the undoped host material comprises oxynitrides or nitrides. ### Claim 15 A light emitting device comprising: a light-emitting structure configured to emit a primary light having a first peak wavelength; and a ceramic wavelength converter assembly configured to receive the primary light from the light-emitting structure, the ceramic wavelength converter assembly comprising: two first layers comprising an undoped host material, or a doped host material; two second layers comprising a barrier material and being disposed between the two first layers; and a third layer comprising a doped host material, or an undoped host material and being disposed between the two second layers, wherein the two first layers comprise the undoped host material when the third layer comprises the doped host material, or wherein the two first layers comprise the doped host material when the third layer comprises the undoped host material. ### Claim 16 (depends on 15) The light emitting device of claim 15, wherein the barrier material is Al2O3. ### Claim 17 (depends on 15) The light emitting device of claim 15, wherein the undoped host material comprises a material selected from the group consisting of garnet, MgAl2O4, silicates, oxynitrides and nitrides. ### Claim 18 (depends on 15) The light emitting device of claim 15, wherein the undoped host material is YAG. ### Claim 19 (depends on 15) The light emitting device of claim 15, wherein the doped host material is YAG:Ce. ### Claim 20 (depends on 15) The light emitting device of claim 15, wherein the undoped host material is YAG and the doped host material is YAG:Ce.