# US 2013/0065008 A1 · Optical recording medium and recording material for the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0065008 A1 - Document ID: US20130065008A1 - Status: Published application - Kind: A1 - Application number: 13/228,469 - Filed: 2011-09-09 - Published: 2013-03-14 - Earliest claimed: 2011-09-09 - Assignees: Ritek Corporation - Inventors: Wei-Hsiang WANG; Po-Fan HSU; Wei-Chong LI - Web page: https://patentgrep.com/patent/US20130065008A1 ## CPC - G11B 7/2433: Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te - G11B 2007/24312: {group 14 elements (e.g. Si, Ge, Sn)} - G11B 2007/24314: {group 15 elements (e.g. Sb, Bi)} - G11B 2007/2432: {Oxygen} - G11B 2007/25706: {containing transition metal elements (Zn, Fe, Co, Ni, Pt)} - G11B 2007/25708: {containing group 13 elements (B, Al, Ga)} - G11B 2007/2571: {containing group 14 elements except carbon (Si, Ge, Sn, Pb)} - G11B 2007/25715: {containing oxygen} - Y10T 428/21: Circular sheet or circular blank - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Disclosed herein is a recording material for an optical recording medium. The recording material has a composition represented by a general formula of BixGeyO(1-x-y), in which x and y respectively are atomic ratios of bismuth and germanium, and satisfy the requirements of the following formulae: 2.8≦(x/y)≦25 and 0.55≦(1−x−y)≦0.62. ## Claims ### Claim 1 A recording material for an optical recording medium, the recording material having a composition represented by a general formula of BixGeyO(1-x-y), and an optical characteristic of the recording material being changed by irradiation of a laser beam, wherein x and y in the general formula respectively represent atomic ratios of bismuth and germanium, and satisfy the requirements of the following formulae: 2.8≦(x/y)≦25 and 0.55≦(1−x−y)<0.62. ### Claim 2 (depends on 1) The recording material according to claim 1, wherein the recording material has an extinction coefficient of less than or equal to 0.3. ### Claim 3 (depends on 1) The recording material according to claim 1, wherein the recording material has a refractive index of about 2.5 to about 3. ### Claim 4 (depends on 1) The recording material according to claim 1, wherein x and y in the general formula satisfy the requirements of the following formulae: 0.2≦x≦0.4 and 0.01≦y≦0.15. ### Claim 5 An optical recording medium, comprising: a substrate; and a recording layer disposed over the substrate, wherein the recording layer has an extinction coefficient of less than or equal to 0.3 and comprises a material represented by a composition formula of BixGeyO(1-x-y), wherein x and y respectively represent atomic ratios of bismuth and germanium, and satisfy the requirements of the following formulae: 2.8≦(x/y)≦25 and 0.55≦(1−x−y)<0.62. ### Claim 6 (depends on 5) The optical recording medium according to claim 5, further comprising a dielectric layer in contact with the recording layer, wherein the dielectric layer has a refractive index of about 2.0 to about 2.5 and the recording layer has a refractive index of about 2.5 to about 3.0. ### Claim 7 (depends on 6) The optical recording medium according to claim 6, wherein x and y in the composition formula satisfy the requirements of the following formulae: 0.2≦x≦0.4 and 0.01≦y≦0.15. ### Claim 8 An optical recording medium, comprising: a substrate; a first passivation layer disposed on the substrate; a second passivation layer disposed over the first passivation layer; a dielectric layer disposed between the first and the second passivation layers, and having a refractive index of about 2.0 to about 2.5; and a recording layer in contact with the dielectric layer, and having a refractive index of about 2.5 to about 3.0, wherein the recording layer comprises a material represented by a composition formula of BixGeyO(1-x-y), wherein x and y respectively represent atomic ratios of bismuth and germanium, and satisfy the requirements of the following formulae: 2.8≦(x/y)≦25 and 0.55≦(1−x−y)<0.62. ### Claim 9 (depends on 8) The optical recording medium according to claim 8, wherein each of the first and second passivation layers has a refractive index of about 2.0 to about 2.7. ### Claim 10 (depends on 8) The optical recording medium according to claim 8, wherein a difference between the refractive index of the recording layer and the refractive index of the dielectric layer is about 0.25 to about 0.55. ### Claim 11 (depends on 8) The optical recording medium according to claim 8, wherein at least one of the first and second passivation layers comprises at least one material selected from the group consisting of zinc sulfide (ZnS), silicon dioxide (SiO2), chromium oxide (Cr2O3), zirconium dioxide (ZrO2), titanium dioxide (TiO2), niobium pentaoxide (Nb2O5), tantalum pentoxide (Ta2O5), indium oxide (In2O3), zinc oxide (ZnO), tin dioxide (SnO2), cerium dioxide (CeO2) and aluminum oxide (Al2O3). ### Claim 12 (depends on 8) The optical recording medium according to claim 8, wherein the dielectric layer comprises a material selected from the group consisting of zinc sulfide (ZnS), silicon dioxide (SiO2), chromium oxide (Cr2O3), zirconium dioxide (ZrO2), titanium dioxide (TiO2), niobium pentaoxide (Nb2O5), tantalum pentoxide (Ta2O5), indium oxide (In2O3), zinc oxide (ZnO), tin dioxide (SnO2), cerium dioxide (CeO2), aluminum oxide (Al2O3) and a combination thereof. ### Claim 13 (depends on 8) The optical recording medium according to claim 8, wherein the dielectric layer has a thickness of about 30 nm to about 40 nm. ### Claim 14 (depends on 8) The optical recording medium according to claim 8, wherein the recording layer has a thickness of about 15 nm to about 30 nm. ### Claim 15 An optical recording medium, comprising: a substrate; a first recording structure, comprising: a first dielectric layer disposed over the substrate; and a first recording layer disposed on and in contact with the first dielectric layer; a second recording structure arranged over the first recording structure, and comprising: a second dielectric layer disposed over the first recording layer; and a second recording layer disposed on and in contact with the second dielectric layer; and a third recording structure arranged over the second recording structure, and comprising: a third dielectric layer disposed over the second recording layer; and a third recording layer disposed on and in contact with the third dielectric layer; wherein each of the first, second and third recording layers has an extinction coefficient of less than or equal to 0.3 and comprises a material represented by a composition formula of BixGeyO(1-x-y), wherein x and y respectively represent atomic ratios of bismuth and germanium, and satisfy the requirements of the following formulae: 2.8≦(x/y)≦25 and 0.55≦(1−x−y)<0.62; and wherein each of the first, second and third dielectric layers has a refractive index of about 2.0 to about 2.5. ### Claim 16 (depends on 15) The optical recording medium according to claim 15, further comprising a first, a second, a third, a fourth, a fifth and a sixth passivation layer, wherein the first and second passivation layers are respectively disposed below and above the first recording structure, the third and fourth passivation layers are respectively disposed below and above the second recording structure, and the fifth and sixth passivation layers are respectively disposed below and above the third recording structure. ### Claim 17 (depends on 16) The optical recording medium according to claim 16, wherein each of the first, second, third, fourth, fifth and sixth passivation layers has a refractive index of about 2.0 to about 2.7. ### Claim 18 (depends on 15) The optical recording medium according to claim 15, wherein x and y in the composition formula satisfy the requirements of the following formulae: 0.2≦x≦0.4 and 0.01≦y≦0.15. ### Claim 19 (depends on 15) The optical recording medium according to claim 15, wherein the third recording layer has a thickness less than a thickness of each of the first and second recording layers. ### Claim 20 (depends on 15) The optical recording medium according to claim 15, wherein each of the first, second and third dielectric layers has a thickness greater than a thickness of each of the first, second and third recording layers.