Abstract A phosphor CdMoO4:Dy3+ was prepared by co-precipitation method at room temperature. The effects of annealing temperature on its structural, surface morphology and luminescence properties have been investigated. The crystal structure and phase composition of the prepared phosphors was investigated by XRD and Raman spectroscopy. SEM analysis indicated an increase of grain size and change of morphology with annealing temperature. The excitation spectra of all the prepared samples were found to consist of a strong broad band originated from the MoO42− group of host lattice and narrow peaks originated from the electronic transitions within the 4f orbitals of Dy3+ ion. With increasing the annealing temperature, the maximum of the broad band was shifted towards the longer wavelength region. When excited at UV and NUV regions, two primary sharp emission bands centering at 490 and 575 nm were obtained. The intensities of the peaks were increased with the rise of annealing temperature which is because of the increase of crystallinity, size and change of morphology. CIE chromaticity diagram showed a nearly white color when excited at 274 nm and multiple colors on excitation at 353 nm. It is strongly believed from the observations that the prepared samples may get potential applications in LED based devices.

中文翻译：

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退火温度对室温共沉淀法合成的CdMoO4:Dy3+荧光粉结构和发光性能的影响

摘要 采用共沉淀法在室温下制备了CdMoO4:Dy3+荧光粉。研究了退火温度对其结构、表面形貌和发光性能的影响。通过XRD和拉曼光谱研究了制备的荧光粉的晶体结构和相组成。SEM 分析表明晶粒尺寸增加和形貌随退火温度的变化而变化。发现所有制备的样品的激发光谱由源自主晶格的 MoO42- 基团的强宽带和源自 Dy3+ 离子 4f 轨道内的电子跃迁的窄峰组成。随着退火温度的升高，宽带的最大值向更长的波长区域移动。在 UV 和 NUV 区域激发时，获得了以 490 和 575 nm 为中心的两个主要的尖锐发射带。峰的强度随着退火温度的升高而增加，这是由于结晶度、尺寸和形态变化的增加。CIE 色度图在 274 nm 激发时显示近白色，在 353 nm 激发时显示多种颜色。观察结果强烈相信，所制备的样品可能在基于 LED 的设备中获得潜在应用。