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Anthracene-Resorcinol Derived Covalent Organic Framework as Flexible White Light Emitter

Authors
  • HALDAR, S
  • CHAKRABORTY, D
  • ROY, B
  • BANAPPANAVAR, G
  • RINKU, K
  • MULLANGI, D
  • HAZRA, P
  • KABRA, D
  • VAIDHYANATHAN, R
Publication Date
Dec 03, 2018
Source
DSpace at IIT Bombay
Keywords
License
Unknown
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Abstract

The ordered modular structure of a covalent organic framework (COF) facilitates the selective incorporation of electronically active segments that can be tuned to function cooperatively. This designability inspires developing COF-based single-source white light emitters, required in next-generation solid-state lighting. Here, we present a new anthracene-resorcinol-based COF exhibiting white light emission. The keto-enol tautomers present in the COF give rise to dual emission, which can be tuned by the O-donor and N-donor solvents. Importantly, when suspended in a solid polymer matrix, this dual emission is retained as both tautomers coexist. A mere 0.32 wt % loading of the COF in poly(methyl methacrylate) (PMMA) gives a solvent-free film with intense white light emission (CIE coordinates (0.35, 0.36)). From steady-state and time-resolved studies, the mechanism of the white light emission has been unambiguously assigned to fluorescence, with the blue emission originating from the pi-stacked columns of anthracene, and the mixture of red and green from the keto-enol tautomerized resorcinol units. The study introduces the COF as a new class of readily processable, single-source white light emitter.

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