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Superalkalis fabricated Te-containing [8]circulenes as outstanding NLO materials; a DFT perspective

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DOI: 10.1016/j.comptc.2023.114226

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Nonlinear optics; Te-containing [8]circulene; Superalkali; Hyperpolarizability; DFT

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In this study, a new class of theoretically designed materials (AxY@C16Te8 (A = K, Na, Li, and x = 2, 3 4)) was explored for optoelectronic and nonlinear (NLO) applications via DFT calculations. The results showed that these complexes exhibit high thermodynamic stability and remarkable nonlinear optical (NLO) response.
There is a growing demand for thermodynamically stable and highly polarizable materials with excess electrons in the fields of optics. In this study, a new class of theoretically designed materials (AxY@C16Te8 (A = K, Na, Li, and x = 2, 3 4)) are explored for optoelectronic and nonlinear (NLO) applications via DFT calculations. Various superalaklis (AxY (Y = O, N, F and x = 2, 3, 4)) are doped on C16Te8 nano-surface. The outcomes of DFT revealed high thermodynamic stability of these complexes. Natural bond orbital (NBO) charge analysis illustrated that charge transfer occurred from superalkali toward Te-containing [8]circulene (C16Te8). HOMO - LUMO energy gap is reduced after doping. Moreover, (AxY@C16Te8 (A = K, Na, Li, x= 2, 3 4, and Y = O, N, F) complexes exhibit remarkably large nonlinear optical (NLO) response. The static first hyperpolarizability (& beta;o) of these complexes ranges between 3.28 x 103 - 2.60 x 105 au. The NLO response of the designed complexes is further explored by computing second hyperpolarizability (& gamma;tot), frequency-dependent hyperpolarizability, and nonlinear refractive index.

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