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Nevertheless, embedding persistent luminescence functionality into solution\u2010processable optoelectronic platforms is still bottlenecked, as classic persistent phosphors suffer from poor film\u2010forming ability and low electrical conductivity for device integration. Herein, we report ligand\u2010free Sb\u2010doped Cs\n                    <jats:italic>\n                      <jats:sub>n<\/jats:sub>\n                    <\/jats:italic>\n                    <jats:sub>+1<\/jats:sub>\n                    Cd\n                    <jats:italic>\n                      <jats:sub>n<\/jats:sub>\n                    <\/jats:italic>\n                    Cl\n                    <jats:sub>3<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>n<\/jats:sub>\n                    <\/jats:italic>\n                    <jats:sub>+1<\/jats:sub>\n                    Ruddlesden\u2013Popper perovskite nanocrystals (NCs), where the inorganic layer number (\n                    <jats:italic>n<\/jats:italic>\n                    ) regulates local octahedral distortion and further tailors the intrinsic electron\u2010trap configuration. Benefiting from this precise structural modulation, the NC films achieve persistent luminescence with a duration over 5000 s and superior photoluminescence quantum efficiency. Combined spectroscopic characterization and first\u2010principles calculations reveal that the\n                    <jats:italic>n<\/jats:italic>\n                    \u2010tuned crystal framework generates differentiated trap energy levels, which dominate carrier trapping, storage and radiative release kinetics. Finally, a long\u2010lived ultraviolet\u2010sensitive photonic synapse is achieved by integrating optimized\n                    <jats:italic>n<\/jats:italic>\n                    = 2 perovskite NCs with single\u2010walled carbon nanotube networks. The fabricated device features ultralong persistent photocurrent, 160% paired\u2010pulse facilitation ratio, slow charge decay dynamics, and visual image retention capability. This work establishes a scalable solution\u2010processed perovskite platform bridging structure\u2010customized trap states, ultralong\u2010lived optical memory, and optoelectronic synaptic behaviors, which paves a feasible pathway for developing integrated sensing\u2010memory neuromorphic architectures.\n                  <\/jats:p>","DOI":"10.1002\/advs.78101","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T05:08:01Z","timestamp":1790744881000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Trap\u2010Programmable Ruddlesden\u2013Popper Perovskite Nanocrystals for Persistent Optoelectronic Memory and Photonic Synapses"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-9541-6521","authenticated-orcid":false,"given":"Xuanyu","family":"Zhu","sequence":"first","affiliation":[{"name":"Department of Physics and Materials The Hong Kong Polytechnic University  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and Materials The Hong Kong Polytechnic University  Hong Kong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiangbo","family":"Peng","sequence":"additional","affiliation":[{"name":"Department of Physics and Materials The Hong Kong Polytechnic University  Hong Kong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-0647-3923","authenticated-orcid":false,"given":"Yuxuan","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Physics and Materials The Hong Kong Polytechnic University  Hong Kong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiatong","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Physics and Materials The Hong Kong Polytechnic University  Hong Kong 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