【摘要】 用固相反应法制备了Er3+掺杂摩尔分数为1%的ZrO2材料;X射线衍射图表明该种材料为混合相晶体结构;用Nd∶YAG激光器的三次谐波(355nm)和二极管激光器(980nm)为激发源激发样品,分别测量了它的发光和上转换发射,观察到了较强的绿光和相对较弱的红光发射。同时对该样品进行了喇曼光谱实验,发现该材料的晶格振动能量相对较小。通过分析发现低的声子能量和低的掺杂浓度是该样品发绿光的主要原因。更多还原

【Abstract】 Zirconia has attracted very much the attention of technologists and scientists d ue to its combined electrical, chemical, optical, and mechanical characteristics . Zirconia has prominent characteristics such as chemical stability, high mechan ical strength, high resistance to corrosion, heat resistance, electric insulatio n, high refractive index, etc, which makes this material suitable for optical ap plication. It has been reported that pure zirconia presents low phonon energy, i ncreasing the probability of radiative transitions in rare earth doped samples . Interest in nanocrystalline zirconia ceramics with average grain sizes below 100 nm has increased during the past few years as their properties (such as sinterab ility and superplastic behavior) are often significantly different and considera bly improved compared with conventional zirconia ceramics with coarser grain str uctures. Synthesis of powder with high purity, ultrafine, agglomeratefree and narrow size distribution is the first and perhaps the most important step in pr o ducing nanozirconia ceramics with desirable microstructure and characterizatio n . Various techniques including wetchemical synthesis by precipitation of hydro x ides from salt have been the most commonly used methods for the synthesis of nan ozirconia powders. In this paper, Zirconia doped with 1% Er3+ ions wa s prepa red by solid phase reaction method. The XRD showed that the crystal structure of this material was polygonal. Raman spectrum indicated that its phonon energy wa s low. Its emission spectrum under the excitation of the third harmonic of a Nd ∶ YAG laser (355nm) and its upconversion spectrum with strong green emission and weak red emission under the excitation of a semiconductor diode laser (980nm) we re obtained. The strong green and weak red emission was caused by the low phonon energy and the low doped concentration in the sample.更多还原