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.
We succeeded in synthesizing phosphorus (P)-doped ZnO microspheres using a ZnO sintered target containing 2 wt% of P2O5 by pulsed laser ablation in air. Phosphorus is one of the prospective materials for p-type ZnO. Raman peak of the Pdoped ZnO microspheres indicated local vibrational mode of P-O. Additionally, room-temperature photoluminescence (RT-PL) properties of the microsphere were investigated under laser excitation using a Q-switched Nd:YAG laser (355 nm) and He-Cd laser (325 nm) in the air. P-doped ZnO microspheres showed whispering-gallery-mode (WGM) lasing in ultraviolet (UV) region by optical pumping.
We succeeded in synthesizing antimony (Sb)-doped ZnO microspheres by ablating a ZnO sintered target containing 5 wt% of Sb with a Nd:YAG laser at a fluence of 25 J/cm2 in air. The well-spherical ZnO microcrystals with diameters of 1-20 μm were collected on a substrate which was put near the ablation spot. Most of the ZnO microspheres have a crystalline structure. In addition, Raman peak of the Sb-doped ZnO microspheres was shifted toward lower frequency side, indicating substitutional Sb3+ at Zn antisite. Room-temperature photoluminescence properties of the microsphere were investigated under 325 nm He-Cd laser or 355 nm Nd:YAG laser excitation. An ultraviolet (UV) emission and lasing in whispering gallery mode were observed from the photoexcited microsphere.
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