202831-65-0Relevant articles and documents
Study on new quinacridone derivatives with enhanced third-order nonlinear optical properties
Cui, Yanhong,Jia, Jianhong,Liang, Guanqiu,Sha, Yangcheng,She, Yuanbin,Yu, Guoyi,Zhou, Chunsong
, (2020)
Seven new quinacridone derivatives were designed and synthesized. The relationship between molecular structure and nonlinear optical properties was studied by cyclic voltammetry, DFT calculation and Z-scan. By introducing strong electron donating groups at the two sides of the quinacridone, and then introducing a strong electron withdrawing group dicyanoethylene group, the band gap of the molecule can be effectively reduced, and the intramolecular charge transfer can be promoted. The results shown that the HOMO/LUMO band gaps of the target compounds are all reduced, and QA-F has the best third-order nonlinear optical performance, and its γ (γ = 5.32 × 10?33 esu) is 4.38 times that of QA-1 (γ = 1.21 × 10?33 esu).
One/two-photon-sensitive photoacid generators based on benzene oligomer-containing D-π-A-type aryl dialkylsulfonium salts
Jin, Ming,Wu, Xingyu,Xie, Jianchao,Malval, Jean Pierre,Wan, Decheng
, p. 55340 - 55347 (2015)
Novel sulfonium-based D-π-A photoacid generators (PAGs) with a benzene oligomer (from one to four) as a π-conjugated system that are highly photosensitive in the near-ultraviolet region (365 nm) were prepared. The maximum absorption and molar extinction coefficients of the PAGs redshifted and enhanced with the increasing length of the conjugated systems. The quantum yields of PAGs were high (three of them were over 0.6) and improved by adjusting the number of the phenyl rings. The quantum chemical calculation results proved that the molecular configuration and nature of the frontier orbitals are crucial factors which affect PAG performance. Photopolymerization kinetic results demonstrated that these sulfonium-based PAGs were highly efficient cationic photoinitiators, and the i-line sensitivities were evaluated based on the photolithographic performance of the PAG-containing SU-8 resins. In addition, the two-photon absorption cross sections (δ700 nm > 400 GM) matched the requirements needed in the 3D fabrication of polymer microstructures.
Terphenyl backbone-based donor-π-acceptor dyads: Geometric isomer effects on intramolecular charge transfer
Kim, Min-Ji,Ahn, Mina,Shim, Jun Ho,Wee, Kyung-Ryang
, p. 3370 - 3378 (2020/02/25)
The molecular geometry effects of ortho, meta, and para-terphenyl based donor-π-acceptor (D-π-A) dyads on intramolecular charge transfer (ICT) were studied to investigate structure-ICT relationships. Terphenyl based D-π-A dyads were prepared by two-step palladium catalyzed, Suzuki-Miyaura coupling reactions, in which triphenylamine (TPA) was used as the electron donor and 1,2-diphenyl-benzimidazole (IMI) as the electron acceptor. The photophysical and electrochemical properties of terphenyl backbone-based ortho (O), meta (M), and para (P) dyads were compared. In steady state absorption spectra, a red-shift of CT band was observed in the order O M P, which was attributed to terphenyl isomer conjugation effects and agreed well with density functional theory (DFT) based calculations. In particular, the emission spectra of the three terphenyl D-π-A dyads produced showed similar emission maxima at ~475 nm and a bathochromic shift property was observed in order to increase the solvent polarity, indicating the ICT process. From Lippert-Mataga plots, excited-state dipole moment changes (Δμ) were estimated to be 31.5 Debye (D) for O, 62.9 D for M, and 51.5 D for P. For M isomer, a large Δμ and the markedly reduced quantum yield was shown, as well as photo-induced electron transfer (PET) was expected in the excited state, but no radical species were observed by femtosecond transient absorption (TA) measurements. Based on experimental results, we conclude that all three terphenyl based D-π-A dyads, including non-conjugated ortho- and meta-terphenyl dyads, exhibit partial charge transfer rather than unit-electron transfer.
Organic electroluminescent material and OLED (organic electroluminescent device) comprising same
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Paragraph 0040; 0046; 0047, (2019/10/01)
The invention provides an organic electroluminescent material and an OLED (organic electroluminescent device) comprising the same. The structural formula of the organic electroluminescent material isshown in the description. Compared with a monoamine structure containing adamantly, a diamine structure contained in the material has higher HOMO energy and hole mobility and can show higher efficiency and longer service life than a device made of a monoamine material. The OLED comprising the organic electroluminescent material has lower driving voltage, higher luminous efficiency and longer service life.