倒锥形抗反射表面微结构的构筑

利用Langmuir-Blodgett(LB) 技术在单晶硅表面转移岛状硬脂酸单层膜图案, 通过各向异性的湿法刻蚀构筑倒锥形表面微结构. 倒锥形结构的深度及表面抗反射性能主要与刻蚀的时间有关. 这种方法结合了自组装面积大和湿法刻蚀成本低的优点, 是一种廉价、高效的制备大面积抗反射微结构的方法, 在降低光学器件和太阳能电池的成本方面具有潜在应用价值.     

Theoretical Investigations on Electronic Structures and Absorption Spectra of Unsymmetrical Metal-coordinated Neo-confused Porphyrin in Various Solvents

Though the photo-physical properties of free base porphyrin are attractive, there are still problems for the materials with weak and narrow range absorption of visible light. The unsymmetrical neo-confused porphyrin derivatives were introduced as novel materials for the improvement of photo-chemical and photo-physical properties. The density function theory(DFT)and time dependent density function theory(TDDFT) were applied to calculate the absorption spectrum of unsymmetrical neo-confused porphyrin(N-CP) and metal-coordinated N-CP in various solutions. The Ni and Zn coordinated neo-confused porphyrin dipole moment values are smaller than the values of prototype porphyrin(Pro P) and N–CP. According to the electrophilicity index ω, Ni coordinated N–CP(Ni–N–CP) is susceptible to the polarity of solvents, while the Zn coordinated derivative(Zn–N–CP) is more immune to the solvent environment. Unlike the Gouterman's four frontier orbital model of common porphyrin materials, the electron transitions of N–CPs and metalcoordinated N–CPs from H–2 or lower molecular orbitals also contribute to ultraviolet and visible absorption. Most of oscillator strength f values of Zn–N–CP are significantly higher than the values of Ni–N–CP, which reflects the higher absorption intensity of Q and Soret bands. The maximum wavelength at 702.2 nm in vacuum drew our attention to the novel material. The broad absorption range, intense red-shifted Q band and higher stability in solvents suggest that N–CPs, especially Zn–N–CP, can be one class of new candidate dye-sensitized materials.     

模板诱导有机发光小分子定位沉积

通过模板诱导有机发光小分子定位沉积的方法构筑了大面积纳微米尺度的荧光图案.模板是以纳米压印技术构筑的聚合物微结构为阻挡层蒸镀金属,经Lift-off后形成的金属微结构.在模板表面,有机发光小分子与金属区域的结合能大于与裸硅片区域的结合能,因此,选择结构合适的模板可诱导有机发光小分子定位沉积.这种快速制备大面积荧光图案的...