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Activated Triplet Exciton Release for Highly Efficient Room-Temperature Phosphorescence Based on S,N-Doped Polymeric Carbon Nitride
journal contribution
posted on 2022-01-13, 18:09 authored by Wenhai Wang, Ruolan Mei, Qixiao Zhao, Cong Liu, Hongyu Chen, Shichen Su, Shuangpeng WangPolymeric
carbon nitride (PCN) shows great potential applications
in the areas of sustainable energy (photocatalysis and photoelectric
conversion, as well as other important catalytic reactions), biosensing,
biomedicine, devices, and more, but efficient phosphorescence is very
scarce because of the lack of an effective synthetic method and an
unsettled phosphorescent mechanism. Herein, we report a strategy to
promote efficient phosphorescence to activate triplet exciton release
by introduction of S and N elements. PCN could be synthesized by thiourea
or urea (named S,N-PCN and N-PCN, respectively) at a relatively low
reaction temperature (260 °C). S,N-PCN exhibits phosphorescence
quantum yield (4.15%) higher than that (0.41%) for N-PCN. The introduction
of C=S and C≡N groups in S,N-PCN networks could boost the intersystem
crossing (ISC), leading to small singlet–triplet energy (ΔEST) up to more triplet exciton generation. Considering
the excellent optical stability of PCN, a preliminary application
of visible-light-excited PCN in advanced anticounterfeiting is proposed.
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unsettled phosphorescent mechanismtriplet exciton generationisc ), leadingexcellent optical stabilityeffective synthetic methodtemperature phosphorescence basedhighly efficient room15 %) higherpromote efficient phosphorescenceefficient phosphorescence41 %)sustainable energypreliminary applicationphotoelectric conversionintersystem crossinge advanced anticounterfeiting>< sub