Aggregation induced enhancement of linear and nonlinear optical emission from a hexaphenylene derivative

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Publication year
2016Source
Advanced Functional Materials, 26, 48, (2016), pp. 8968-8977ISSN
Publication type
Article / Letter to editor

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Organization
Spectroscopy of Solids and Interfaces
Ultrafast Spectroscopy of Correlated Materials
Solid State Chemistry
Molecular Materials
Radboud Institute for Molecular Life Sciences
Journal title
Advanced Functional Materials
Volume
vol. 26
Issue
iss. 48
Page start
p. 8968
Page end
p. 8977
Subject
Molecular Materials; Solid State Chemistry; Spectroscopy of Solids and InterfacesAbstract
The discovery of the phenomenon known as aggregation-induced emission (AIE) has opened the door to a variety of brilliant organic solid-state light-emitting materials. While AIE is well established in linear optics, the development of AIE luminogens (AIEgens) with highly efficient nonlinear optical (NLO) effects remains relatively unexplored. Particularly, second-order NLO requires the AIEgens to be organized in a non-centrosymmetric fashion, and such examples are rarely reported. Here, an AIEgen, 2,7-di([1,1-biphenyl]-4-yl)-fluorenone (4-DBpFO), is designed and synthesized by introducing a carbonyl group onto the backbone of p-hexaphenylene. The restricted rotation of the compound upon aggregation results in a dramatic enhancement of the linear optical emission when forming self-assemblies. Furthermore, introducing the carbonyl group drives the formation of hydrogen bonded molecular chains, which are attached by the zigzag CH interactions in a non-centrosymmetric way. As a result, the dipole of each individual molecule contributes accumulatively to a macroscopic dipole of the formed 4-DBpFO microcrystals. This leads to a highly efficient second harmonic generation with very high laser damage treshold. This AIEgen, whose optical response is greatly enhanced in both linear and nonlinear optical regimes upon the formation of well-defined self-assemblies, has potential applications in next generation photonic circuits.
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- Faculty of Science [31885]
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