Optical properties of highly luminescent zinc oxide tetrapod powders

Abstract

Zinc oxide tetrapod powders with high luminescent characteristics have been grown by simple evaporation and direct oxidation of zinc. Their structural and optical properties have been studied by transmission electron microscopy and by cathodoluminescence. The legs of the tetrapods have a pure hexagonal structure and form an arrowhead joint at the center. The tetrapod legs exhibit strong band edge and weak green luminescence. Monochromatic cathodoluminescence images show that the band-edge emission originates from the bulk of the legs, while the green emission emanates from the surface, indicative of it being related to oxygen vacancies. Low temperature cathodoluminescence shows a direct correlation of near-band-edge emission with specific sites within the structure.

Synthesis and Optical Properties of Tetrapod‐Like ZnSSe Alloy Nanostructures

“…Similar observations have been reported in CL studies of ZnO nanotetrapods. [26] In conclusion, we have prepared T-ZnSSe nanostructures of different compositions by a simple CVD method. XRD, EDX, SAED, and HRTEM studies reveal that they are of high purity, and have a single crystalline wurtzite structure with legs growing along the c-axis direction.…”

Inner surface enhanced femtosecond second harmonic generation in thin ZnO crystal tubes

“…1 Most of the previous works about the optical properties of ZnO with various morphologies were conducted in the linear area. [2][3][4][5] More recently, the nonlinear optical properties of ZnO, for instance, second harmonic generation ͑SHG͒, 6-10 third harmonic generation, 11,12 and multiphoton absorption ͑MPA͒ induced luminescence, [13][14][15] have been investigated. However, relatively weak SHG emission to the band edge emission was observed in singlecrystal ZnO bulk.…”

Soft template synthesis of ZnO nanorods and their optical properties

“…There are many reasons for variation of the strength and location of UV peaks. In the present study, we believe it may be due to electron-phonon interaction at different temperatures [6,9,10]. With increasing temperature, the electron-phonon interaction becomes stronger.…”