A field-emission cathode is fabricated with ZnO tetrapodlike nanoemitters. With a simple planar triode structure, a cathodoluminescent light source has been investigated. Because of the characteristics of surface-conduction electron-emission planar triode, this cathodoluminescent light source shows a very good performance. As experimental results show, the turn-on electric field is about 1 V/mum, whereas the current density is 1 muA/cm². The threshold electric field is 1.6 V/mum, whereas the current density is 1 mA/cm². When a pulse voltage with 4% duty cycle is applied on the gate electrode, the fluctuation of anode current is smaller than 15 % during 200 h.

Ce ³⁺ –Bi ³⁺ –Yb ³⁺ tri-doped Y ₃ Al ₅ O ₁₂ phosphors are one of most the potential candidates of down-conversion materials for photovoltaic cells.

A plasmonic lattice mode (PLM) is demonstrated in the periodic Ag nanoparticle arrays, which are fabricated by thermal evaporation and focused-ion beam. In the arrays, each Ag nanoparticle is located on the top of a quartz trapezoidal pillar, which sits on a quartz substrate. Higher quartz trapezoidal pillars can make the transmittance of the structure vary rapidly from the maximum to the minimum in a narrow wavelength band due to the coupling between localized surface plasmonic resonance of Ag nanoparticles and the wavelength-dependent diffraction, while the phenomenon cannot be observed in the structure with lower pillars. FDTD simulation not only gives results which are similar to the experimental ones, but also shows that, when the size of Ag nanoparticles is large, it is possible to form PLM at two different wavelengths. This provides a possible way to extend the application of PLM.