14 March 2016 Fabrication and bandgap engineering of doped ZnO microspheres by simple laser ablation in air
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We synthesized magnesium (Mg)-doped ZnO microspheres by laser ablation of a ZnO sintered target containing magnesium oxide (MgO) with the fundamental of a Nd:YAG laser at 1064 nm. The well-spherical ZnO microcrystals with diameters of 1-20 μm were collected on a substrate which was put near the ablation spot. X-ray diffraction and micro-Raman spectrum indicate that the ZnO microspheres have a crystalline structure. Room-temperature photoluminescence properties of the microsphere were investigated under third harmonic generation of a Nd:YAG laser excitation at 355 nm. An ultraviolet (UV) lasing in whispering gallery mode (WGM) and blue-shift of the UV WGM peaks were observed from the Mg-doped ZnO microsphere.
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Daisuke Nakamura, Daisuke Nakamura, Tetsuya Shimogaki, Tetsuya Shimogaki, Toshinobu Tanaka, Toshinobu Tanaka, Fumiaki Nagasaki, Fumiaki Nagasaki, Yuki Fujiwara, Yuki Fujiwara, Mitsuhiro Higashihata, Mitsuhiro Higashihata, Hiroshi Ikenoue, Hiroshi Ikenoue, Tatsuo Okada, Tatsuo Okada, "Fabrication and bandgap engineering of doped ZnO microspheres by simple laser ablation in air", Proc. SPIE 9735, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXI, 973511 (14 March 2016); doi: 10.1117/12.2214054; https://doi.org/10.1117/12.2214054

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