Journal
ADVANCED SCIENCE
Volume 7, Issue 4, Pages -Publisher
WILEY
DOI: 10.1002/advs.201902688
Keywords
carbonized polymer dots; high quantum yield; hybrid fluorescence; phosphorescence; white light emission; white light-emitting diodes
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Funding
- National Natural Science Foundation of China (NSFC) [11774188]
- Incubation Program of Universities' Preponderant Discipline of Shandong Province [03010304]
- Mountain Tai Young Scholarship [23170504]
- Excellent Youth Foundation of Shandong's Natural Scientific Committee [JQ201802]
- Scientific Research Foundation for Doctors in Qilu University of Technology (Shandong Academy of Sciences) [81110306]
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Fluorescent carbon dots (CDs) are compelling optical emitters to construct white light-emitting diodes (WLEDs). However, it remains a challenge to achieve large-scale and highly efficient single-component white-light-emissive CDs suitable for WLED applications. Herein, a low cost, fast processable, environmentally friendly, and one-step synthetic approach is developed for the preparation of gram-scale and highly efficient single-component white-light-emissive carbonized polymer dots (SW-CPDs). It is revealed that hybrid fluorescence/phosphorescence components cooperatively contribute to the emergence of white light emission. The SW-CPDs exhibit a record quantum yield (QY) of approximate to 41% for the white light emission observed in solid-state CD systems, while the QY of the phosphorescence is approximate to 23% under ambient conditions. Heavy doping of N and P elements as well as presence of covalently cross-linked polymer frameworks is suggested to account for the emergence of hybrid fluorescence/phosphorescence, which is supported by the experimental results and theoretical calculations. A WLED is fabricated by applying the SW-CPDs on an UV-LED chip, showing favorable white-light-emitting characteristics with a high luminous efficacy of 18.7 lm W-1 that is comparable to that of state-of-the-art WLEDs reported before.
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