High-quality KMgF3 single crystal containing 0.5 mol% europium (Eu) was prepared by an improved Bridgman method. X-ray diffraction (XRD), photoluminescence spectra and fluorescence lifetime were measured. The results in-dicate the reduction of Eu3+ to Eu2+ in the KMgF3 single crystal. Under the excitation of 259 nm, 370 nm and 394 nm, the sample has two distinct emissions of Eu2+:4f7→4f7(~363 nm) and 4f65d1→4f7 (~440 nm). The substitution site for Eu ion is confirmed. The optical property investigation result shows that the Eu2+ doped KMgF3 single crystal may be used as potential laser media and related materials for optical devices.

The growth of Na5Lu9F32 single crystals doped with Cr3+ ions in 0.1 mol%, 0.2 mol% and 0.5 mol% concentrations by Bridgman method was reported. The optical absorption and luminescence spectra decisively demonstrate that the Cr dopant enters Na5Lu9F32 as Cr3+. Fluorescence emission at wavelengths of 418 nm, 444 nm, 653 nm and 678 nm can be observed under the excitation of 372 nm and the fluorescence lifetime at 418 nm was measured to be ~10.31 μs. The possible crystal sites for Cr3+ ions in Na5Lu9F32 single crystal were discussed, and the lattice parameter Dq, Racach parameters B and C were estimated.

利用水热法分别合成了Ce3+、Tb3+共掺杂的YPO4下转换荧光粉和Er3+、Yb3+、Tm3+共掺杂的YPO4上转换荧光粉, 经过工艺优化获得了1 μm左右尺寸均匀的发光材料。通过系列实验研究了反应温度、反应时间、稀土离子掺杂比例和退火温度对样品发光性能的影响。YPO4∶Ce3+,Tb3+荧光粉在295 nm紫外光的激发下产生下转换发光效应, 当Tb3+摩尔分数为1%时得到明亮的绿光; YPO4∶Er3+, Tm3+, Yb3+荧光粉在980 nm近红外光激发下产生上转换发光效应, 当稀土离子中Er3+摩尔分数为3%时, 所制备的样品经过1 000 ℃退火处理后发出很强的暖白光。

用化学法测定水稻抗性淀粉含量耗时长、 成本高, 为此, 探索了基于近红外光谱技术(NIRS)的水稻抗性淀粉含量测定新途径。 首先, 采集了62份抗性淀粉含量差异较大的水稻的光谱数据, 将光谱数据和已测定的化学值数据导入化学计量学软件, 采用偏最小二乘法（PLS）建立了抗性淀粉含量的近红外定标模型, 对不同预处理得到的预测模型进行了内部验证和外部验证。 结果如下: 内部交叉验证方面, 未处理、 MSC+1thD预处理、 1thD +SNV预处理的决定系数(R2)分别为0.920　2, 0.967　0, 0.976　7, 预测均方根误差（RMSEP）分别为1.533　7, 1.011　2, 0.837　1。 外部验证方面, 未处理、 MSC+1thD预处理和1thD +SNV预处理的决定系数(R2)分别为0.805, 0.976, 0.992, 绝对误差平均值分别为1.456, 0.818, 0.515, 预测值和化学值之间没有显著差异（Turkey法多重比较）, 说明以近红外光谱分析法代替化学测定法是有可能的。 在不同预处理方法之中, 1thD+SNV的预处理方法无论内部验证还是外部验证都具有较高的决定系数和较低的误差值, 定标模型精度更高, 误差更小。