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However, vapor\u2010deposited blue perovskite light\u2010emitting diodes have so far relied predominantly on Br\/Cl mixed\u2010halide bandgap engineering, which is prone to halide migration and phase segregation under operation and therefore suffers from spectral instability. Here, we report spectrally stable vapor\u2010deposited, pure\u2010bromide blue perovskite light\u2010emitting diodes with spectrally stable emission achieved via a ligand\u2010buffered delayed nucleation (LBDN) strategy. In this method, p\u2010Br\u2010MBABr is co\u2010deposited as a kinetic buffer to create a ligand\u2010coordinated precursor state that suppresses immediate crystallization, delays nucleation, and confines subsequent crystal growth. As a result, we obtain quantum\u2010confined CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    nanocrystal films with tunable blue emission. Fully vapor\u2010deposited PeLEDs based on these films deliver spectrally stable pure\u2010blue electroluminescence. These results establish kinetic buffering as an effective route to quantum\u2010confined perovskites under vapor deposition and spectrally stable blue emitters for monolithically integrated full\u2010color perovskite displays.\n                  <\/jats:p>","DOI":"10.1002\/adma.74731","type":"journal-article","created":{"date-parts":[[2026,8,21]],"date-time":"2026-08-21T05:06:58Z","timestamp":1787288818000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Vacuum\u2010Based Monolithically In Situ Integration of Quantum\u2010Confined CsPbBr\n                    <sub>3<\/sub>\n                    Nanocrystals for Spectrally Stable Blue Electroluminescence"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-9685-7055","authenticated-orcid":false,"given":"Jianfeng","family":"Ou","sequence":"first","affiliation":[{"name":"Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and Technology  Wuhan Hubei P. 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