Journal
SYMMETRY-BASEL
Volume 14, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/sym14050882
Keywords
dendronized hyperbranched polymer; nonlinear optics; chromophores
Categories
Funding
- National Natural Science Foundation of China [52103228]
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Organic/polymeric second-order nonlinear optical (NLO) materials have played a significant role in laser technology and optical fiber communication, but the intermolecular electrostatic interactions limit their efficiency. Dendrimers and hyperbranched polymers have been proposed as better alternatives for highly efficient NLO materials. Dendronized hyperbranched polymers (DHPs) have shown many advantages in the NLO field, such as easy synthesis, large NLO coefficients, and high orientation stability.
Organic/polymeric second-order nonlinear optical (NLO) materials, which rely on the poling-induced non-centrosymmetric arrangement of NLO chromophores, have played a very important role in laser technology and optical fiber communication, due to their ultra-fast response speed, excellent machining performance and low dielectric constant. However, the NLO chromophores have the large dipole moments with strong intramolecular charge transfer, which lead to the intermolecular electrostatic interactions to tend to the centrosymmetric arrangement and decrease the poling efficiency. Since the special three-dimensional spatial separation can minimize these strong intermolecular electrostatic interactions during poling process, dendrimers and hyperbranched polymers have been considered as better topology for the next generation of highly efficient NLO materials. In 2013, by the attachment of low generation dendrimers to the hyperbranched backbone, a new dendritic architecture of dendronized hyperbranched polymer (DHP) was proposed for improving the comprehensive performance of NLO materials. Recent results showed many advantages of DHPs in NLO field, such as easy syntheses, large NLO coefficients and high orientation stability, etc. In this review, the latest advancement of DHPs, including the design principle, synthesis, as well as their application as NLO materials is summarized. The new opportunities arising from DHPs are also summarized in the future perspective.
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