Rapid construction and intrinsic mechanism of host-guest room temperature phosphorescence systems
Source abstract
Abstract
To obtain long-lived pure organic room-temperature phosphorescence (PORTP) materials by dissolving and rapid evaporating, 3-(2-(9H-carbazol-9-yl)benzyl)-2,4-diphenylpentanedinitrile (DCN) was designed and synthesized by choosing commercial carbazole. To exclude trace carbazole impurities and enhance compatibility of host and guest materials, 2-(3-(9H-carbazol-9-yl)benzyl)malononitrile (L-DCN) and 2-(3-(5H benzo[b]carbazol-5-yl)benzyl)malononitrile (m-BCzCN) were prepared by self-made carbazole and 2-naphthylamine. Compared crystals DCN and L-DCN, the important role of trace carbazole impurities in enhancing room temperature phosphorescence (RTP) performance was confirmed once again. Then, RTP performance of L-DCN was optimized by host-guest doping and tuning the mass ratios between polyvinyl alcohol (PVA), m-BCzCN and L-DCN. Compared with crystals DCN, RTP performance of 1% L-DCN@PVA is not significantly improved, but 1% L-DCN/m-BCzCN shows almost equivalent afterglow lifetimes, with RTP lifetimes of 435.37 ms and quantum yield (ΦP) of 0.06. Finally, advanced encryptions were successfully constructed based on the different luminescent properties of L-DCN in PVA films at different doping concentrations.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Luminescence and Fluorescent Materials · Molecular Sensors and Ion Detection · Organic Light-Emitting Diodes Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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