4.8 Article

Suppressing molecular motions for enhanced room-temperature phosphorescence of metal-free organic materials

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NATURE COMMUNICATIONS
卷 6, 期 -, 页码 -

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NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms9947

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资金

  1. National Science Foundation [DMREF DMR 1435965]
  2. Samsung GRO grant
  3. Spanish Science Ministry (project MultiCrom) [CTQ2014-58801]
  4. Campus of International Excellence (CEI) UAM+CSIC
  5. Division Of Materials Research
  6. Direct For Mathematical & Physical Scien [1435965] Funding Source: National Science Foundation

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Metal-free organic phosphorescent materials are attractive alternatives to the predominantly used organometallic phosphors but are generally dimmer and are relatively rare, as, without heavy-metal atoms, spin-orbit coupling is less efficient and phosphorescence usually cannot compete with radiationless relaxation processes. Here we present a general design rule and a method to effectively reduce radiationless transitions and hence greatly enhance phosphorescence efficiency of metal-free organic materials in a variety of amorphous polymer matrices, based on the restriction of molecular motions in the proximity of embedded phosphors. Covalent cross-linking between phosphors and polymer matrices via Diels-Alder click chemistry is devised as a method. A sharp increase in phosphorescence quantum efficiency is observed in a variety of polymer matrices with this method, which is ca. two to five times higher than that of phosphor-doped polymer systems having no such covalent linkage.

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