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C. Wong Magna Fund in Ningbo University","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100020738","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Nanophotonics"],"published-print":{"date-parts":[[2026,5,27]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Metal halide perovskites exhibit significant potential for optoelectronic applications due to their exceptional linear and nonlinear optical properties. However, the lead toxicity, coupled with the inherent thermal and photochemical instability of conventional lead\u2010based perovskites, restricts their utility in nonlinear photonic devices that require high\u2010energy excitation. Lead\u2010free metal halide double perovskites (MHDP), notably Cs\n                    <jats:sub>2<\/jats:sub>\n                    AgInCl\n                    <jats:sub>6<\/jats:sub>\n                    , have emerged as environmentally benign alternatives due to their superior structural stability. Nevertheless, systematic investigations of their third\u2010order nonlinear (TON) optical properties remain quite limited. In this work, we use chalcogenide glass (ChG) with intrinsically high TON to host in situ crystallized Cs\n                    <jats:sub>2<\/jats:sub>\n                    AgInCl\n                    <jats:sub>6<\/jats:sub>\n                    nanocrystals, creating a lead\u2010free nanocomposite material. Using Z\u2010scan and I\u2010scan techniques, the synthesized MHDP\u2010ChG composite was found to exhibit high nonlinear refractive indices, large two\u2010photon absorption coefficients, and low optical limiting thresholds at near\u2010infrared wavelengths. This work establishes a novel strategy for lead\u2010free, high\u2010TON\u2010performance MHDP materials and provides critical insights into their applications in nonlinear photonics.\n                  <\/jats:p>","DOI":"10.1002\/nap2.70120","type":"journal-article","created":{"date-parts":[[2026,5,17]],"date-time":"2026-05-17T07:59:32Z","timestamp":1779004772000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Enhanced Third\u2010Order Nonlinear Optics From In Situ Grown Lead\u2010Free Cs\n                    <sub>2<\/sub>\n                    AgInCl\n                    <sub>6<\/sub>\n                    Double Perovskite Nanocrystals in Chalcogenide Glass"],"prefix":"10.1002","volume":"15","author":[{"given":"Ruonan","family":"Chen","sequence":"first","affiliation":[{"name":"Laboratory of Infrared Material and Devices The Research Institute of Advanced Technologies, Ningbo University  Ningbo 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