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Bi\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    Se exhibits exceptional electronic properties as a promising semiconductor, yet its nonlinear optical response under low excitation intensities hinders its practical applications. Therefore, precise Sb\n                    <jats:sup>3<\/jats:sup>\n                    \u207a doping in Bi\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    Se (Bi\n                    <jats:sub>1.9<\/jats:sub>\n                    Sb\n                    <jats:sub>0.1<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    Se) is achieved for the first time via solid\u2010state reaction and systematically studies its impact on the electronic structure and optical properties through first\u2010principles calculations and experimental. The results reveal that Sb\n                    <jats:sup>3<\/jats:sup>\n                    \u207a substitution slightly reduces the bandgap without introducing defect states, and transient absorption spectroscopy further confirms prolonged carrier relaxation. At 1.5\u00a0\u00b5m, the modulation depth from 8.8% to 10.1% while dramatically reducing the saturation intensity from 47.2 to 0.53\u00a0kW\u00a0cm\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    . This improvement is attributed to the stable linear absorption characteristics after doping, the synergistic effect between prolonged relaxation time and free\u2010carrier\u2010induced optical loss. In a mode\u2010locking system, Bi\n                    <jats:sub>1.9<\/jats:sub>\n                    Sb\n                    <jats:sub>0.1<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    Se achieves a broader 3\u2010dB and shorter pulse duration at substantially reduced pump intensities. This work achieves defect\u2010free energy level optimization in Sb\u2010doped Bi\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    Se, where the material's high carrier mobility is not only preserved but further enhanced, while the saturation intensity is declined by about two orders of magnitude, enabling a low\u2010power, high\u2010performance nonlinear photonic devices.\n                  <\/jats:p>","DOI":"10.1002\/advs.202518454","type":"journal-article","created":{"date-parts":[[2025,11,19]],"date-time":"2025-11-19T08:50:45Z","timestamp":1763542245000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Defect\u2010Free Sb\u2010Doping in Bi\n                    <sub>2<\/sub>\n                    O\n                    <sub>2<\/sub>\n                    Se Achieves Two\u2010Order\u2010of\u2010Magnitude Reduction in Saturation Intensity While Preserving High Carrier Mobility"],"prefix":"10.1002","volume":"13","author":[{"given":"Qingling","family":"Tang","sequence":"first","affiliation":[{"name":"School of Information Science and Engineering, and Key Laboratory of Laser and Infrared System of Ministry of Education Shandong University  Qingdao 266237 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7965-7069","authenticated-orcid":false,"given":"Zhongben","family":"Pan","sequence":"additional","affiliation":[{"name":"School of Information Science and Engineering, and Key Laboratory of Laser and Infrared System of Ministry of Education Shandong University  Qingdao 266237 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongwei","family":"Chu","sequence":"additional","affiliation":[{"name":"School of Information Science and Engineering, and Key Laboratory of Laser and Infrared System of Ministry of Education Shandong University  Qingdao 266237 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Han","family":"Pan","sequence":"additional","affiliation":[{"name":"School of Information Science and Engineering, and Key Laboratory of Laser and Infrared System of Ministry of Education Shandong University  Qingdao 266237 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dechun","family":"Li","sequence":"additional","affiliation":[{"name":"School of Information Science and Engineering, and Key Laboratory of Laser and Infrared System of Ministry of Education Shandong University  Qingdao 266237 China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,11,19]]},"reference":[{"key":"e_1_2_8_1_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.4792142"},{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.est.2025.117521"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/adts.201900060"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jmps.2021.104626"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1039\/C9CP01867K"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11433-021-1683-5"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00903904"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.97.241203"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1038\/nphys2049"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1038\/nphys989"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.44.3793"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.367411"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.matt.2022.11.005"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-022-31606-8"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1007\/s12274-019-2554-x"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201800167"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1002\/lpor.202400166"},{"key":"e_1_2_8_18_1","volume":"2022","author":"Zhang Z.","year":"2022","journal-title":"Ultrafast Sci."},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1063\/5.0153891"},{"key":"e_1_2_8_20_1","first-page":"3043","volume":"65","author":"He X.","year":"2023","journal-title":"Technol. 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