Theoretical Study of Energy Gaps for Naphthalimide-based Charge Transfer Compounds

doi:10.6023/A14110795

Acta Chim. Sinica ›› 2015, Vol. 73 ›› Issue (1): 53-59.DOI: 10.6023/A14110795 Previous Articles Next Articles

Article

萘酰亚胺类电荷转移化合物能隙的理论研究

巫友雄^a, 任泓扬^a, 吴义芳^b, 王炳喜^a

a 福州大学材料科学与工程学院福州 350116;
b 菏泽学院化学化工系菏泽 274015

投稿日期:2014-11-19 发布日期:2014-12-30
通讯作者: 王炳喜 E-mail:wangbx08@163.com
基金资助:
项目受福州大学科技发展基金(No. 2010XQ02)资助.

Theoretical Study of Energy Gaps for Naphthalimide-based Charge Transfer Compounds

Wu Youxiong^a, Ren Hongyang^a, Wu Yifang^b, Wang Bingxi^a

a College of Materials Science and Engineering, Fuzhou University, Fuzhou 350116;
b Department of Chemistry and Chemical Engineering, Heze University, Heze 274015

Received:2014-11-19 Published:2014-12-30
Supported by:
Project supported by Science and Technology Development Foundation of Fuzhou University (No. 2010XQ02).

1. Theoretical Study of Energy Gaps for Naphthalimide-based Charge Transfer Compounds.PDF(1100KB)

Abstract

Thermally activated delayed fluorescence (TADF) materials are promising for the next generation of organic light-emitting diodes. To realize reverse intersystem crossing (RISC) effectively for TADF molecules requires basically small energy gap (ΔE_ST) between the lowest singlet (S₁) and triplet (T₁) excited states. In this work, 1,8-naphthalimide was selected as a fixed acceptor (A) because of its large rigid conjugate structure with a high radiative decay rate. Twelve naphthalimide-based intramolecular charge transfer (ICT) compounds were constructed by the conjunction of naphthalimide moiety with each of donors (D) including 9,9-dimethyl-9,10-dihydroacridine, phenoxazine, etc. Their energy gaps were calculated with the Gaussian 09 package at TD-DFT level using the optimal Hartree-Fock exchange method reported by Huang Shuping recently. The results show that D-A structure of naphthalimide-based ICT compounds has smaller ΔE_ST and longer starting fluorescence emission wavelengths (λ) than those for corresponding D-phenyl-A type. However, strong electron donor like 9-(9H-carbazol-3-yl)-9H-carbazole (DCZ) seems to have no significant effect on ΔE_ST and λ at high CT amount. To achieve small ΔE_STof these naphthalimide-based ICT compounds, increasing the twisting angle between D and A, together with enhancing electron donating ability of D is found to be a practical strategy to stabilize the energy of the lowest locally-excited triplet state (³LE) and substantially lower the energy of its lowest CT triplet excited state (³CT). As a result, 4-(9,9-dimethyl-9,10-dihydroacridine)-N-phenyl-1,8-naphthalimide (4b) and 4-(phenoxazine)-N-phenyl-1,8-naphthalimide (5b) show small ΔE_ST of 0.01 eV and 0.02 eV, respectively. Their λ and oscillator strengths of vertical absorption from ground state (S₀) to S₁ are 575 nm and 0.0002 for 4b, while 621 nm and 0.0025 for 5b, respectively. In addition, the λ of compound 5b obtained from its photoluminescence curve is 600 nm, which consists with the computed one with an error of 0.07 eV. Therefore, compounds 4b and 5b can be expected to be potential reddish-orange and red TADF emitters.

Key words: naphthalimide, thermally activated delayed fluorescence, energy gaps, quantum chemical calculation

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Wu Youxiong, Ren Hongyang, Wu Yifang, Wang Bingxi. Theoretical Study of Energy Gaps for Naphthalimide-based Charge Transfer Compounds[J]. Acta Chim. Sinica, 2015, 73(1): 53-59.

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萘酰亚胺类电荷转移化合物能隙的理论研究

Theoretical Study of Energy Gaps for Naphthalimide-based Charge Transfer Compounds

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