{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T19:43:44Z","timestamp":1792784624056,"version":"4.5.0"},"reference-count":35,"publisher":"American Chemical Society (ACS)","issue":"40","license":[{"start":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T00:00:00Z","timestamp":1790121600000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-029"},{"start":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T00:00:00Z","timestamp":1790121600000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-037"},{"start":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T00:00:00Z","timestamp":1790121600000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-045"}],"funder":[{"DOI":"10.13039\/501100006407","name":"Natural Science Foundation of Henan Province","doi-asserted-by":"publisher","award":["262300421061"],"award-info":[{"award-number":["262300421061"]}],"id":[{"id":"10.13039\/501100006407","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Joint Fund Project for Science and Technology Development of Henan Province","award":["245200810080"],"award-info":[{"award-number":["245200810080"]}]},{"name":"Henan Province University Science and Technology Innovation Talent Support Plan","award":["24HASTIT030"],"award-info":[{"award-number":["24HASTIT030"]}]},{"name":"National Natural Science Foundation of China (NSFC)","award":["12474029"],"award-info":[{"award-number":["12474029"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"crossref"}]},{"name":"National Natural Science Foundation of China (NSFC)","award":["12504302"],"award-info":[{"award-number":["12504302"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"crossref"}]},{"name":"National Natural Science Foundation of China (NSFC)","award":["12574286"],"award-info":[{"award-number":["12574286"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,10,8]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Understanding how quantum confinement governs spin-resolved dynamics is essential for the development of perovskite-based spin photonics. Here, we systematically investigate exciton spin relaxation in thickness-tunable CsPbBr3 nanoplatelets via circularly polarized transient absorption spectroscopy. At early delay times (\u223c0.4 ps), state-filling and Pauli exclusion lead to photoinduced absorption signals on opposite energetic sides of the exciton bleach under different circular polarizations. The same polarization spectra exhibit a thickness-dependent sign reversal on the low-energy side of the exciton bleach, arising from the shifting balance between band gap renormalization and rapid radiative recombination. Furthermore, the spin lifetime increases from 0.27 ps for 2-monolayer nanoplatelets to 1.22 ps for 6-monolayer nanoplatelets due to reduced spatial wave function overlap and suppressed exchange interactions. This work provides a crucial framework for designing perovskite gain media and spin-optoelectronic devices.<\/jats:p>","DOI":"10.1021\/acs.jpclett.6c02621","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T05:02:06Z","timestamp":1790139726000},"page":"11486-11493","source":"Crossref","is-referenced-by-count":0,"title":["Tailoring Exciton\nSpin Dynamics via Quantum Confinement\nin CsPbBr3 Nanoplatelets"],"prefix":"10.1021","volume":"17","author":[{"given":"Jie","family":"Li","sequence":"first","affiliation":[{"name":"Henan Normal University , , ,","place":["Xinxiang, China, 453007"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minghuan","family":"Cui","sequence":"additional","affiliation":[{"name":"Henan Normal University , , ,","place":["Xinxiang, China, 453007"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pan","family":"Song","sequence":"additional","affiliation":[{"name":"Henan Normal University , , ,","place":["Xinxiang, China, 453007"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9448-9286","authenticated-orcid":true,"given":"Zhongpo","family":"Zhou","sequence":"additional","affiliation":[{"name":"Henan Normal University , , ,","place":["Xinxiang, China, 453007"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3665-6111","authenticated-orcid":true,"given":"Chaochao","family":"Qin","sequence":"additional","affiliation":[{"name":"Henan Normal University , , ,","place":["Xinxiang, China, 453007"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,23]]},"reference":[{"issue":"7219","key":"2026100811165953500_cit1","doi-asserted-by":"publisher","first-page":"218","DOI":"10.1038\/nature07530","article-title":"Complete Quantum Control\nof a Single Quantum Dot Spin Using Ultrafast Optical Pulses","volume":"456","author":"Press","year":"2008","journal-title":"Nature"},{"issue":"5874","key":"2026100811165953500_cit2","doi-asserted-by":"publisher","first-page":"349","DOI":"10.1126\/science.1154798","article-title":"Picosecond\nCoherent Optical Manipulation of a Single Electron Spin in a Quantum\nDot","volume":"320","author":"Berezovsky","year":"2008","journal-title":"Science"},{"issue":"3","key":"2026100811165953500_cit3","doi-asserted-by":"publisher","first-page":"198","DOI":"10.1038\/nphys1182","article-title":"Spin-Resolved\nQuantum-Dot Resonance Fluorescence","volume":"5","author":"Vamivakas","year":"2009","journal-title":"Nat. Phys."},{"issue":"7302","key":"2026100811165953500_cit4","doi-asserted-by":"publisher","first-page":"91","DOI":"10.1038\/nature09150","article-title":"Tailoring Light-Matter-Spin\nInteractions in Colloidal Hetero-Nanostructures","volume":"466","author":"Zhang","year":"2010","journal-title":"Nature"},{"issue":"8","key":"2026100811165953500_cit5","doi-asserted-by":"publisher","first-page":"5231","DOI":"10.1021\/acs.nanolett.8b02190","article-title":"Boosting Tunable Blue Luminescence of Halide Perovskite\nNanoplatelets through Postsynthetic Surface Trap Repair","volume":"18","author":"Bohn","year":"2018","journal-title":"Nano Lett."},{"issue":"2","key":"2026100811165953500_cit6","doi-asserted-by":"publisher","first-page":"387","DOI":"10.1021\/acs.jpclett.9b03282","article-title":"Exciton, Biexciton,\nand Hot Exciton Dynamics in CsPbBr3 Colloidal Nanoplatelets","volume":"11","author":"Vale","year":"2020","journal-title":"J. Phys. Chem.\nLett."},{"key":"2026100811165953500_cit7","doi-asserted-by":"publisher","first-page":"1161","DOI":"10.1021\/acs.jpclett.7b00017","article-title":"2D Behaviors\nof Excitons in Cesium Lead Halide Perovskite Nanoplatelets","volume":"8","author":"Li","year":"2017","journal-title":"J. Phys. Chem. Lett."},{"issue":"23","key":"2026100811165953500_cit8","doi-asserted-by":"publisher","first-page":"5983","DOI":"10.1039\/C9SC01339C","article-title":"On the Absence of a Phonon Bottleneck in Strongly Confined\nCsPbBr3 Perovskite Nanocrystals","volume":"10","author":"Li","year":"2019","journal-title":"Chem. Sci."},{"issue":"7687","key":"2026100811165953500_cit9","doi-asserted-by":"publisher","first-page":"189","DOI":"10.1038\/nature25147","article-title":"Bright Triplet Excitons in Caesium Lead Halide Perovskites","volume":"553","author":"Becker","year":"2018","journal-title":"Nature"},{"issue":"6","key":"2026100811165953500_cit10","doi-asserted-by":"publisher","first-page":"3692","DOI":"10.1021\/nl5048779","article-title":"Nanocrystals\nof Cesium Lead Halide Perovskites (CsPbX3, X = Cl, Br,\nand I): Novel Optoelectronic Materials Showing Bright Emission with\nWide Color Gamut","volume":"15","author":"Protesescu","year":"2015","journal-title":"Nano Lett."},{"issue":"2","key":"2026100811165953500_cit11","doi-asserted-by":"publisher","first-page":"660","DOI":"10.1039\/D1EE02131A","article-title":"Atomistic\nOrigin of Lattice Softness\nand its Impact on Structural and Carrier Dynamics in Three Dimensional\nPerovskites","volume":"15","author":"Guo","year":"2022","journal-title":"Energy Environ. 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Adv."},{"issue":"12","key":"2026100811165953500_cit28","doi-asserted-by":"publisher","first-page":"6114","DOI":"10.1021\/acsenergylett.5c02899","article-title":"Long-Lived Exciton\nSpin Coherence in Chiral Perovskite Colloidal Quantum Wells","volume":"10","author":"Wei","year":"2025","journal-title":"ACS Energy Lett."},{"issue":"1","key":"2026100811165953500_cit29","doi-asserted-by":"publisher","first-page":"2254","DOI":"10.1038\/s41467-018-04659-x","article-title":"Scaling Law for\nExcitons in 2D Perovskite Quantum Wells","volume":"9","author":"Blancon","year":"2018","journal-title":"Nat.\nCommun."},{"issue":"1","key":"2026100811165953500_cit30","doi-asserted-by":"publisher","first-page":"664","DOI":"10.1038\/s41467-020-14403-z","article-title":"Long-Range\nExciton Transport and Slow Annihilation in Two-Dimensional Hybrid\nPerovskites","volume":"11","author":"Deng","year":"2020","journal-title":"Nat. Commun."},{"issue":"12","key":"2026100811165953500_cit31","doi-asserted-by":"publisher","first-page":"3372","DOI":"10.1021\/acs.jpclett.8b01132","article-title":"\u201cIntact\u201d\nCarrier Doping by Pump\u2013Pump\u2013Probe Spectroscopy in Combination\nwith Interfacial Charge Transfer: A Case Study of CsPbBr3 Nanocrystals","volume":"9","author":"Wang","year":"2018","journal-title":"J. Phys. Chem. Lett."},{"issue":"10","key":"2026100811165953500_cit32","doi-asserted-by":"publisher","first-page":"1800664","DOI":"10.1002\/advs.201800664","article-title":"Coherent Spin and Quasiparticle Dynamics in Solution-Processed\nLayered 2D Lead Halide Perovskites","volume":"5","author":"Giovanni","year":"2018","journal-title":"Adv. Sci."},{"key":"2026100811165953500_cit33","doi-asserted-by":"publisher","first-page":"117682","DOI":"10.1016\/j.jlumin.2020.117682","article-title":"Exciton-Exciton Interaction and Cascade Relaxation\nof Excitons in Colloidal CdSe Nanoplatelets","volume":"229","author":"Smirnov","year":"2021","journal-title":"J. Lumin."},{"issue":"47","key":"2026100811165953500_cit34","doi-asserted-by":"publisher","first-page":"25864","DOI":"10.1021\/jacs.3c10281","article-title":"Sub-Single-Exciton\nOptical Gain in Lead Halide Perovskite Quantum Dots Pevealed by Exciton\nPolarization Spectroscopy","volume":"145","author":"Liu","year":"2023","journal-title":"J. Am. Chem. Soc."},{"issue":"11","key":"2026100811165953500_cit35","doi-asserted-by":"publisher","first-page":"115415","DOI":"10.1103\/b358-1776","article-title":"Scaling Laws of Electron and Hole Spin Relaxation in Indirect Band\nGap (In, Al) As\/AlAs Quantum Dots","volume":"114","author":"Shamirzaev","year":"2026","journal-title":"Phys. Rev.\nB"}],"container-title":["The Journal of Physical\nChemistry Letters"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pubs.acs.org\/doi\/pdf\/10.1021\/acs.jpclett.6c02621","content-type":"application\/pdf","content-version":"vor","intended-application":"unspecified"},{"URL":"https:\/\/pubs.acs.org\/jpclcd\/article-pdf\/17\/40\/11486\/68612228\/acs.jpclett.6c02621.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/pubs.acs.org\/jpclcd\/article-pdf\/17\/40\/11486\/68612228\/acs.jpclett.6c02621.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T15:50:14Z","timestamp":1791474614000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.acs.org\/jpclcd\/article\/17\/40\/11486\/5436084\/Tailoring-Exciton-Spin-Dynamics-via-Quantum"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,23]]},"references-count":35,"journal-issue":{"issue":"40","published-online":{"date-parts":[[2026,9,23]]},"published-print":{"date-parts":[[2026,10,8]]}},"URL":"https:\/\/doi.org\/10.1021\/acs.jpclett.6c02621","relation":{},"ISSN":["1948-7185"],"issn-type":[{"value":"1948-7185","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,23]]}}}