To enhance the nonlinear optical properties of graphene oxide in organic solvent and polymeric matrix, lutecium phthalocyanines (LuPc) and hyperbranched lutecium phthalocyanines (HBLuPc) have been grafted on the surface of graphene oxide, respectively. After the surficial modification, the electron transfer process between phthalocyanines and graphene oxide has been also facilitated, resulting in significant fluorescence quenching. Given the combination of nonlinear scattering, two-photon absorption with reverse saturable absorption and the photo-induced electron or energy transfer from the electron donor (phthalocyanine moiety) to the acceptor (graphene oxide), stronger nonlinear optical properties can be realized based on graphene oxide hybrids compared with graphene oxide and phthalocyanines. Furthermore, graphene oxide hybrid modified by hyperbranched lutecium phthalocyanines exhibits the best optical limiting response and the highest nonlinear extinction coefficient at 532 nm in both organic solvent and polymeric matrix. Interestingly, we also find that it could exhibit better optical limiting properties than those possessed by pure phthalocyanine at 1064 nm.

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具有增强非线性光学特性的超支化镥酞菁接枝乙二胺@氧化石墨烯

为了增强氧化石墨烯在有机溶剂和聚合物基质中的非线性光学性质，已将酞菁镥（LuPc）和超支化酞菁（HBLuPc）分别接枝到氧化石墨烯的表面。表面改性后，酞菁与氧化石墨烯之间的电子转移过程也得到了促进，导致显着的荧光猝灭。考虑到非线性散射、具有反向可饱和吸收的双光子吸收以及从电子供体（酞菁部分）到受体（氧化石墨烯）的光致电子或能量转移的组合，基于石墨烯可以实现更强的非线性光学特性氧化物杂化物与氧化石墨烯和酞菁相比。此外，由超支化镥酞菁改性的氧化石墨烯杂化物在有机溶剂和聚合物基质中在 532 nm 处表现出最佳的光学限制响应和最高的非线性消光系数。有趣的是，我们还发现它在 1064 nm 处比纯酞菁具有更好的光学限制特性。