Author:
Han Kui ,Li Ming-Xue ,Li Hai-Peng ,Wu Yu-Xi ,Tang Gang ,Wu Qiong-Hua ,Tong Xing ,Zhong Qi ,
Abstract
The molecular first hyperpolarizabilities β and ultraviolet spectra of two-dimensional charge transfer (2DCT) substituted annulenes by employing MP2 and TD-DFT approach, respectively. It is found that these 2DCT molecules 2—6 possess larger β values and blue-shifted absorption spectra in comparison with 1DCT molecules 8 and 9. It is helpful to solve the nonlinearity-transparency trade-off. For 2DCT molecules 2—7, values of β depend on the band length alternation (BLA) and when the BLA increases, the values of β decrease. Moreover, there is not a relationship between β and HOMO-LUMO energy gap ΔEHL for 2DCT molecules. The maximum absorption wavelength λmax of 2DCT molecules originates from deeper energy level orbital transition than HOMO→LUMO transition.
Publisher
Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
Subject
General Physics and Astronomy