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Super alkali (OLi3) doped boron nitride with enhanced nonlinear optical behavior

    In this study, density functional theory is used to examine the electronic and nonlinear optical properties of a narrative class boron nitride (B12N12) doped with super alkali OLi3. From the computational investigations, these complexes are highly stable and superalkali prefer a cubic position of the nanocage energetically to be chemisorbed. When superalkali doped on B12N12, a significant decrease in the HOMO–LUMO energy gap was observed and this shifted the B12N12 nanocage from insulator to n-type semiconductor. The HOMO–LUMO energy gap of pure B12N12 was 6.84eV and when superalkali (OLi3) is doped on it, the HOMO–LUMO energy gap was changed in the range of 3.94–0.42eV. BNM2b showed a HOMO–LUMO energy gap of 3.94eV, while BNM4a showed a minimum HOMO–LUMO energy gap (0.42eV). Further, these systems showed a remarkable large first hyperpolarizability (β) in the range of 626.72–75,757au and 1045–12,6261au. When the charge was shifted from superalkali to the nanocage, a small change in transition energies has occurred and consequently, hyperpolarizability (β) values increased significantly. The vertical ionization energy of pure B12N12 is 7.71eV, as superalkali is doped on it showed a significant change in VIE in BNM2b that indicated the highest VIE of about 6.47eV and BNM4a indicated lowest VIE 2.51eV. The TD-DFT investigations described that complexes illustrated greater transparency in the UV part which involves apart from greater NLO response for practical applications in the area of activity of optoelectronics.


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    Published: 8 July 2021