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jixiang7804

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[交流] 【求助】氧化锌的荧光性

【求助】氧化锌的荧光性
我做的氧化锌激发波长335，发射在435有一个最大吸收，这能说明什么，荧光性怎么样，谢谢

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金属材料论文润色/翻译怎么收费? 已经有131人回复

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J. Phys. Chem. B 2007, 111, 14311-14317

Microstructure Control of Zn/ZnO Core/Shell Nanoparticles and Their
Temperature-Dependent Blue Emissions
Haibo Zeng,*,† Zhigang Li, Weiping Cai,*,‡ Bingqiang Cao, Peisheng Liu, and Shikuan Yang
Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanostructure, Institute of
Solid State Physics, Chinese Academy of Sciences, Hefei 230031, P.R. China
ReceiVed: September 1, 2007; In Final Form: October 7, 2007
The microstructure of the Zn/ZnO core/shell nanoparticles synthesized by laser ablation in liquid medium
can be facilely controlled. With the surfactant concentration increased over the critical micelle concentration,
the nanoparticle transformed from pure ZnO to a Zn/ZnO core/shell structure. Further, with a decrease of the
applied laser power, the ZnO shell thickness was monotonously reduced till 2.5 nm and the ultrafine ZnO
nanocrystals embedded in the nanoshells were also reduced till 1.5 nm, which induced the increase of the
disorder degree of the nanoshell lattice. The controlling mechanism was discussed according to the competition
of capping protection and the oxidation reaction of laser-induced plasma. Blue photoluminescence from the
ZnO nanoshells was observed. The emission band exhibited abnormal red-blue shift and narrowing with
increasing temperature. Such temperature-dependent behaviors can be well described by a localization model
involving an interstitial zinc defect center. These results indicate that this method provides a convenient and
universal way to obtain various metal/oxide core/shell nanoparticles with controllable microstructure, and it
will be beneficial to an understanding of the physical origins of the blue emission in nanostructured ZnO as
well as to extending its optical and electronic applications.