A quantum chemical screening of two imidazole-based chalcone ligands: 2-</span></span><span><span><span style="font-family:""> </span></span></span><sp...A quantum chemical screening of two imidazole-based chalcone ligands: 2-</span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:"">[1-(3-(1H-imidazol-1-yl)propylimino)-3-(phenylallyl)]phenol and 2-</span></span></span><span><span><span style="font-family:"">[1-(3-(1H-</span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:"">imidazol-1-yl)propylimino)-3-4-nitrophenylallyl]phenol (hereinafter ref</span></span></span><span><span><span style="font-family:"">erred to as HL1 and HL2 respectively) and their Pd, Pt and Zn chelates for charge transport and nonlinear optical (NLO) properties, is reported via dispersion-</span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:"">corrected density functional theory (DFT-D3) and time-dependent DFT (TD-</span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:"">DFT) methods. From our results, Pd and Pt complexes have been observed to show excellent hole-transport properties, owing to their very small reorgani<span>zation energies. The <span>light </span>extraction efficiency of the HL1-Pt complex was de</span>duced to be particularly impressive, thus suitable for the manufacture of <span>hole transport</span> layer in violet light emitting diodes (LEDs). Moreover, redox potentials and chemical stability studies have enabled us </span></span></span><span><span><span style="font-family:"">to </span></span></span><span><span><span style="font-family:"">validate the greater <span>stability in moisture (towards oxidation), of HL2 complexes compared to th</span>eir HL1 counterparts. The first and second hyperpolarizabilities of both ligands and their complexes have been found to be outstandingly higher than those of the push-pull prototypical, <span>para</span>-nitroaniline by factors of up to 12 in the case of HL2. These compounds, with the exception of the HL2-Pt complex, are thus interesting candidates having wide transparency tradeoffs for NLO efficiency in the manufacture of optoelectronic and photonic devices capable of second and third-order NLO response. Finally, metal chelation has been established to enhance the NLO response of all the chalcone-based imidazole ligands investigated as a result of metal-ligand charge transfer and ligand-</span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:"">metal charge transfer electronic transitions identified in the resulting complexes with the exception of the zinc complexes.展开更多
A series of star-shaped molecules with benzene core and naphthalimides derivatives end groups have been designed to explore their optical,electronic,and charge transport properties as charge transport and/or luminesce...A series of star-shaped molecules with benzene core and naphthalimides derivatives end groups have been designed to explore their optical,electronic,and charge transport properties as charge transport and/or luminescent materials for organic light-emitting diodes(OLEDs). The frontier molecular orbitals(FMOs) analysis has turned out that the vertical electronic transitions of absorption and emission are characterized as intramolecular charge transfer(ICT). The calculated results show that the optical and electronic properties of star-shaped molecules are affected by the substituent groups in N-position of 1,8-naphthalimide ring. Our results suggest that star-shaped molecules with n-butyl(1),benzene(2),thiophene(3),thiophene S?,S?-dioxide(4),benzo[c][1,2,5]thiadiazole(5),and 2,7a-dihydrobenzo[d]thiazole(6) fragments are expected to be promising candidates for luminescent and electron transport materials for OLEDs. This study should be helpful in further theoretical investigations on such kind of systems and also to the experimental study for charge transport and/or luminescent materials for OLEDs.展开更多
Theoretically,1,2,3-benzotriazole(BT)-based derivative is designed by the struc-tural tuning in 2,1,3-benzothiadiazole(BTD)-based derivative and presents potential for applications in organic light-emitting diodes...Theoretically,1,2,3-benzotriazole(BT)-based derivative is designed by the struc-tural tuning in 2,1,3-benzothiadiazole(BTD)-based derivative and presents potential for applications in organic light-emitting diodes(OLEDs).Calculations show that the emission spectrum of BT-based derivative is located at the blue scope,so it can act as a blue-light-emitting material.Importantly,the oscillator strength of emission spectrum is significantly enhanced by replacing BTD with BT,implying it possess large fluorescent intensity.Additionally,BT-based derivative exhibits improved hole transportation with respect to the BTD-based derivative.展开更多
文摘A quantum chemical screening of two imidazole-based chalcone ligands: 2-</span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:"">[1-(3-(1H-imidazol-1-yl)propylimino)-3-(phenylallyl)]phenol and 2-</span></span></span><span><span><span style="font-family:"">[1-(3-(1H-</span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:"">imidazol-1-yl)propylimino)-3-4-nitrophenylallyl]phenol (hereinafter ref</span></span></span><span><span><span style="font-family:"">erred to as HL1 and HL2 respectively) and their Pd, Pt and Zn chelates for charge transport and nonlinear optical (NLO) properties, is reported via dispersion-</span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:"">corrected density functional theory (DFT-D3) and time-dependent DFT (TD-</span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:"">DFT) methods. From our results, Pd and Pt complexes have been observed to show excellent hole-transport properties, owing to their very small reorgani<span>zation energies. The <span>light </span>extraction efficiency of the HL1-Pt complex was de</span>duced to be particularly impressive, thus suitable for the manufacture of <span>hole transport</span> layer in violet light emitting diodes (LEDs). Moreover, redox potentials and chemical stability studies have enabled us </span></span></span><span><span><span style="font-family:"">to </span></span></span><span><span><span style="font-family:"">validate the greater <span>stability in moisture (towards oxidation), of HL2 complexes compared to th</span>eir HL1 counterparts. The first and second hyperpolarizabilities of both ligands and their complexes have been found to be outstandingly higher than those of the push-pull prototypical, <span>para</span>-nitroaniline by factors of up to 12 in the case of HL2. These compounds, with the exception of the HL2-Pt complex, are thus interesting candidates having wide transparency tradeoffs for NLO efficiency in the manufacture of optoelectronic and photonic devices capable of second and third-order NLO response. Finally, metal chelation has been established to enhance the NLO response of all the chalcone-based imidazole ligands investigated as a result of metal-ligand charge transfer and ligand-</span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:"">metal charge transfer electronic transitions identified in the resulting complexes with the exception of the zinc complexes.
基金Support by the National Natural Science Foundation of China(No.21563002)the Natural Science Foundation of Inner Mongolia Autonomous Region(No.2015MS0201)the Research Program of Sciences at Universities of Inner Mongolia Autonomous Region(No.NJZZ235)
文摘A series of star-shaped molecules with benzene core and naphthalimides derivatives end groups have been designed to explore their optical,electronic,and charge transport properties as charge transport and/or luminescent materials for organic light-emitting diodes(OLEDs). The frontier molecular orbitals(FMOs) analysis has turned out that the vertical electronic transitions of absorption and emission are characterized as intramolecular charge transfer(ICT). The calculated results show that the optical and electronic properties of star-shaped molecules are affected by the substituent groups in N-position of 1,8-naphthalimide ring. Our results suggest that star-shaped molecules with n-butyl(1),benzene(2),thiophene(3),thiophene S?,S?-dioxide(4),benzo[c][1,2,5]thiadiazole(5),and 2,7a-dihydrobenzo[d]thiazole(6) fragments are expected to be promising candidates for luminescent and electron transport materials for OLEDs. This study should be helpful in further theoretical investigations on such kind of systems and also to the experimental study for charge transport and/or luminescent materials for OLEDs.
基金supported by the Education Office of Jilin Province (No.2010142)Institute Foundation of Siping City (No.2010009)
文摘Theoretically,1,2,3-benzotriazole(BT)-based derivative is designed by the struc-tural tuning in 2,1,3-benzothiadiazole(BTD)-based derivative and presents potential for applications in organic light-emitting diodes(OLEDs).Calculations show that the emission spectrum of BT-based derivative is located at the blue scope,so it can act as a blue-light-emitting material.Importantly,the oscillator strength of emission spectrum is significantly enhanced by replacing BTD with BT,implying it possess large fluorescent intensity.Additionally,BT-based derivative exhibits improved hole transportation with respect to the BTD-based derivative.