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Nevertheless, their room\u2010temperature phosphorescence (RTP) performance still largely lags behind their outstanding fluorescence emission, especially in the blue\u00a0spectral region. Herein, high\u2010efficiency blue RTP CDs have been designed and constructed via a simple molecular engineering strategy, enabling CDs with an unprecedented phosphorescence quantum efficiency of to 50.17% and a long lifetime of 2.03 s. This treating route facilitates the formation of high\u2010density (<jats:italic>n<\/jats:italic>, \u03c0*) configurations in the CD \u03c0\u2013\u03c0 conjugate system through the introduction of abundant functional groups, which can evoke a strong spin\u2010orbit coupling and further promote the intersystem crossing from singlet to triplet excited states and radiative recombination from triplet excited states to ground state. With blue phosphorescent CDs as triplet donors, green, red, and white afterglow composites are successfully fabricated via effective phosphorescence F\u00f6rster resonance energy transfer. Importantly, the color temperature of the white afterglow emission can be widely and facilely tuned from cool white to pure white and warm white. Moreover, advanced information encryption, light illumination, and afterglow\/dynamic visual display have been demonstrated when using these multicolor\u2010emitting CD\u2010based afterglow systems.<\/jats:p>","DOI":"10.1002\/adma.202207970","type":"journal-article","created":{"date-parts":[[2022,11,22]],"date-time":"2022-11-22T13:23:51Z","timestamp":1669123431000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":183,"title":["A Molecular Engineering Strategy for Achieving Blue Phosphorescent Carbon Dots with Outstanding Efficiency above 50%"],"prefix":"10.1002","volume":"35","author":[{"given":"Zhijiang","family":"Song","sequence":"first","affiliation":[{"name":"State Centre for International Cooperation on Designer Low\u2010Carbon &amp; Environmental Materials School of Materials Science and Engineering Zhengzhou University  Zhengzhou 450001 P. R. 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