{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T18:40:42Z","timestamp":1788460842580,"version":"build-2803163510"},"reference-count":36,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2025,2,5]],"date-time":"2025-02-05T00:00:00Z","timestamp":1738713600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Seed Funding for Basic Research and Research Output Award of the University of Hong Kong and RGC GRF projects","award":["17311422"],"award-info":[{"award-number":["17311422"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Two-dimensional tin halide perovskites are of significant interest for light emitting applications. Here, we investigate the effect of organic cation A on the stability of different Dion\u2013Jacobson tin-based halide perovskites. The ASnBr4 materials using diammonium cation A with shorter alkyl chains are found to exhibit improved stability, exhibiting dramatic stability difference between the most stable HDASnBr4, where HDA denotes 1,6-hexanediammonium, and two materials with 8- and 10-carbon alkyl chain ammonium cations. The HDASnBr4 powders were thermally stable at 100 \u00b0C in an argon environment but exhibited decreasing photoluminescence with time in ambient air at 100 \u00b0C. The sample degradation at 100 \u00b0C is accelerated compared to room temperature, but it proceeds along similar pathways, namely phase transformation followed by perovskite decomposition. Light emission from HDASnBr4 thin films could be further enhanced by methanol vapor treatment, and warm white emission with Commission Internationale de l\u2019Eclairage (CIE) coordinates (0.37, 0.34) could be obtained by combining HDASnBr4 with a blue-emitting polymer film, while direct mixing of blue phosphor and HDASnBr4 powder yields white emission with CIE coordinates of (0.34, 0.32).<\/jats:p>","DOI":"10.3390\/molecules30030703","type":"journal-article","created":{"date-parts":[[2025,2,5]],"date-time":"2025-02-05T05:50:36Z","timestamp":1738734636000},"page":"703","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Photoluminescence and Stability of Dion\u2013Jacobson Tin-Based Halide Perovskites with Different Spacer Cation Chain Length"],"prefix":"10.3390","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4115-0702","authenticated-orcid":false,"given":"Muhammad Umair","family":"Ali","sequence":"first","affiliation":[{"name":"Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wen Ting","family":"Sun","sequence":"additional","affiliation":[{"name":"Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aleksandr A.","family":"Sergeev","sequence":"additional","affiliation":[{"name":"Department of Physics and William Mong Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Clearwater Bay, Hong Kong"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8324-7305","authenticated-orcid":false,"given":"Atta Ur","family":"Rehman","sequence":"additional","affiliation":[{"name":"Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kam Sing","family":"Wong","sequence":"additional","affiliation":[{"name":"Department of Physics and William Mong Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Clearwater Bay, Hong Kong"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5183-1467","authenticated-orcid":false,"given":"Aleksandra B.","family":"Djuri\u0161i\u0107","sequence":"additional","affiliation":[{"name":"Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0800-2249","authenticated-orcid":false,"given":"Jasminka","family":"Popovi\u0107","sequence":"additional","affiliation":[{"name":"Ru\u0111er Bo\u0161kovi\u0107 Institute, Bijeni\u010dka 54, 10000 Zagreb, Croatia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,2,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2302679","DOI":"10.1002\/adom.202302679","article-title":"Recent Advances in Optical Properties and Light-Emitting Diode Applications for 2D Tin Halide Perovskites","volume":"12","author":"Xing","year":"2024","journal-title":"Adv. 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