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However, developing violet-blue perovskite lasers, which typically rely on bromide\u2013chloride mixed halide systems, has long been hindered by uncontrollable crystallization and high defect density caused by poor crystal quality. Here, we develop an isomerization-driven halide exchange strategy for the growth of chloride mixed wide-band gap perovskite, which is fundamentally distinct from the violent, unregulated processes of traditional methods. This mild and kinetically controlled reaction enables the formation of uniform, highly crystallized violet-blue perovskite films with drastically reduced defect density and suppressed nonradiative recombination. As a result, an ultralow amplified spontaneous emission threshold of 1.4 \u03bcJ cm\u20132 is achieved at 423 nm, which is 5.1 times lower than the best previously reported value. More importantly, a random and single-mode laser threshold of 2.6 and 6.5 \u03bcJ cm\u20132 at 423 nm is achieved. The robust and homogeneous structure enables exceptional operational stability, with a T95 lifetime exceeding 7 \u00d7 107 pulses under intense excitation (25\u00d7 threshold) in ambient conditions without encapsulation. This work establishes a generalizable, universal paradigm for synthesizing high-quality wide-band gap perovskites, which provides a versatile and robust method for the development of advanced violet-blue optoelectronic devices.<\/jats:p>","DOI":"10.1021\/acsnano.6c11529","type":"journal-article","created":{"date-parts":[[2026,8,5]],"date-time":"2026-08-05T13:02:38Z","timestamp":1785934958000},"page":"23002-23012","source":"Crossref","is-referenced-by-count":0,"title":["Dynamic Molecular\nConformational Isomerization-Driven\nHalide Exchange of Perovskite Enabling Ultrastable and Low-Threshold\nViolet-Blue Lasing"],"prefix":"10.1021","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3443-8604","authenticated-orcid":true,"given":"Hao","family":"Wang","sequence":"first","affiliation":[{"name":"Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS) , , ,","place":["Shanghai, China, 201800"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Siyu","family":"Dong","sequence":"additional","affiliation":[{"name":"Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS) , , ,","place":["Shanghai, China, 201800"]},{"name":"University of Chinese Academy of Sciences , , ,","place":["Hangzhou, China, 310024"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5966-0175","authenticated-orcid":true,"given":"Xianyuan","family":"Jiang","sequence":"additional","affiliation":[{"name":"ShanghaiTech University , , ,","place":["Shanghai, China, 201210"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingyu","family":"Ma","sequence":"additional","affiliation":[{"name":"ShanghaiTech University , , ,","place":["Shanghai, China, 201210"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-8840-0014","authenticated-orcid":true,"given":"Xin","family":"Wen","sequence":"additional","affiliation":[{"name":"ShanghaiTech University , , ,","place":["Shanghai, China, 201210"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haobo","family":"Wu","sequence":"additional","affiliation":[{"name":"ShanghaiTech University , , ,","place":["Shanghai, China, 201210"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qian","family":"Li","sequence":"additional","affiliation":[{"name":"Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS) , , ,","place":["Shanghai, China, 201800"]},{"name":"University of Chinese Academy of Sciences , , ,","place":["Hangzhou, China, 310024"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fengxian","family":"Zhou","sequence":"additional","affiliation":[{"name":"Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS) , , ,","place":["Shanghai, China, 201800"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiayun","family":"Sun","sequence":"additional","affiliation":[{"name":"The University of Hong Kong , , Pokfulam Road, ,","place":["Hong Kong, China, 999077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chang","family":"Liu","sequence":"additional","affiliation":[{"name":"Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS) , , ,","place":["Shanghai, China, 201800"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Zhou","sequence":"additional","affiliation":[{"name":"ShanghaiTech University , , ,","place":["Shanghai, China, 201210"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gaoqi","family":"Liu","sequence":"additional","affiliation":[{"name":"ShanghaiTech University , , ,","place":["Shanghai, China, 201210"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2229-9897","authenticated-orcid":true,"given":"Yuequn","family":"Shang","sequence":"additional","affiliation":[{"name":"Zhengzhou University , , ,","place":["Zhengzhou, China, 450001"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-1901-4604","authenticated-orcid":true,"given":"Dong","family":"Liu","sequence":"additional","affiliation":[{"name":"Shandong University , , , ,","place":["Qingdao, Shandong, China, 266237"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9757-3056","authenticated-orcid":true,"given":"Zhengzheng","family":"Liu","sequence":"additional","affiliation":[{"name":"Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS) , , ,","place":["Shanghai, China, 201800"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9535-4076","authenticated-orcid":true,"given":"Wallace C. 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Mater."},{"key":"2026081810275828500_cit20","doi-asserted-by":"publisher","first-page":"1047","DOI":"10.1007\/s11426-018-9325-7","article-title":"Chemical regulation\nof metal halide perovskite nanomaterials for efficient light-emitting\ndiodes","volume":"61","author":"Wang","year":"2018","journal-title":"Sci. China Chem."},{"key":"2026081810275828500_cit21","doi-asserted-by":"publisher","first-page":"2554","DOI":"10.1002\/anie.201703226","article-title":"Perovskite\nSolar Cells: From the Atomic Level to Film Quality and Device Performance","volume":"57","author":"Saliba","year":"2018","journal-title":"Angew. Chem., Int. Ed."},{"key":"2026081810275828500_cit22","doi-asserted-by":"publisher","first-page":"267","DOI":"10.1021\/acs.jpclett.1c03891","article-title":"A-Site Substitute for\nFabricating All-Inorganic Perovskite CsPbCl3 with Application\nin Self-Powered Ultraviolet Photodetectors","volume":"13","author":"Ren","year":"2022","journal-title":"J. Phys. Chem. Lett."},{"key":"2026081810275828500_cit23","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-019-09876-6","article-title":"All-optical\ncontrol of lead halide\nperovskite microlasers","volume":"10","author":"Zhang","year":"2019","journal-title":"Nat. Commun."},{"key":"2026081810275828500_cit24","doi-asserted-by":"publisher","DOI":"10.1038\/ncomms9056","article-title":"Low-threshold\namplified spontaneous\nemission and lasing from colloidal nanocrystals of caesium lead halide\nperovskites","volume":"6","author":"Yakunin","year":"2015","journal-title":"Nat. Commun."},{"key":"2026081810275828500_cit25","doi-asserted-by":"publisher","first-page":"21356","DOI":"10.1021\/acsami.2c02811","article-title":"Ultrafast Antisolvent\nGrowth of Single-Crystalline CsPbCl3 Microcavity for Low-Threshold\nRoom Temperature Blue Lasing","volume":"14","author":"Zhang","year":"2022","journal-title":"ACS Appl. 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Funct.\nMater."},{"key":"2026081810275828500_cit33","doi-asserted-by":"publisher","first-page":"4252","DOI":"10.1021\/ja01598a017","article-title":"Radiochlorine Exchange\nReactions in Acid Chloride Solvents and in Liquid Sulfur Dioxide","volume":"78","author":"Masters","year":"1956","journal-title":"J. Am. Chem. Soc."},{"key":"2026081810275828500_cit34","doi-asserted-by":"publisher","first-page":"2301","DOI":"10.1021\/acsenergylett.8b01441","article-title":"Giant Photoluminescence Enhancement in CsPbCl3 Perovskite\nNanocrystals by Simultaneous Dual-Surface Passivation","volume":"3","author":"Ahmed","year":"2018","journal-title":"ACS Energy Lett."},{"key":"2026081810275828500_cit35","doi-asserted-by":"publisher","first-page":"17026","DOI":"10.1021\/acs.jpcc.9b04412","article-title":"Energy Transfer Dynamics of Highly\nStable Fe3+ Doped CsPbCl3 Perovskite Nanocrystals\nwith Dual-Color\nEmission","volume":"123","author":"Rana","year":"2019","journal-title":"J. Phys. Chem. C"},{"key":"2026081810275828500_cit36","doi-asserted-by":"publisher","DOI":"10.1038\/s41377-023-01112-7","article-title":"In-situ growth\nof low-dimensional perovskite-based insular nanocrystals for highly\nefficient light emitting diodes","volume":"12","author":"Wang","year":"2023","journal-title":"Light: Sci.\nAppl."},{"key":"2026081810275828500_cit37","doi-asserted-by":"publisher","first-page":"7500","DOI":"10.1021\/acs.jpcc.1c10915","article-title":"Surface Ligand Tuning of Coordination\nGeometry and Pb 6s2 Electronic\nPair Stereochemical Activity in MAPbBr3 Perovskite Nanoparticles:\nA Joint Experimental and Theoretical Insight","volume":"126","author":"Yin","year":"2022","journal-title":"J. Phys. Chem. 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