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White Emissive Carbon Dots Actuated by the H‑/J-Aggregates and Förster Resonance Energy Transfer
journal contribution
posted on 2019-06-26, 00:00 authored by Dan Qu, Dongxue Yang, Yukun Sun, Xiayan Wang, Zaicheng SunCarbon
dots (CDs) have been demonstrated to be fluorescent materials
for the new phosphor-free white light-emitting diodes (WLEDs). Herein,
we synthesized a novel white CDs (WCDs). The spectrum highly matches
the solar light spectrum (AM 1.5), which is a potentially high-color-quality
lighting source material. The CDs contain blue, green, and red emissive
centers produced from catechol, o-phenylenediamine,
and their complexes, respectively. In addition, the photoluminescence
mechanism had been revealed; three emission centers could be excited
by a single UV source actuated by the formation of H- and J-aggregates
and FRET between the CDs. Then the phosphor-free WLEDs were fabricated
with a UV chip encapsulated with silicon resin containing the as-obtained
CDs, which exhibit CIE coordinates of (0.33,0.33), a color rendering
index (CRI) of 93, and a correlated color temperature (CCT) of 5453
K. The WLEDs show super stability and a high solar spectrum matching
degree of 85–114%, protecting the eyesight. This provides a
new way to design healthy lighting materials.
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CCTlighting materials5453 Ksilicon resinemissive centersCRIWhite Emissive Carbon Dots Actuatedlight-emitting diodesexhibit CIE coordinatesUV sourceWLEDs showhigh-color-quality lighting source materiallight spectrumFRETcolor temperaturephotoluminescence mechanismemission centersAMphosphor-free WLEDsWCDUV chip encapsulatedas-obtained CDs
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