Host Sensitized Luminescence and Time-Resolved Spectroscopy of YVO4: Ho3+ Nanocrystals☆
Host Sensitized Luminescence and Time-Resolved Spectroscopy of YVO4: Ho3+ Nanocrystals☆
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DOI：
10.1016/j.phpro.2015.10.023
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
M. Mahata;Tristan Koppe;H. Hofsäss;Kaushal Kumar;U. Vetter
中科院分区：
文献类型：
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作者：
M. Mahata;Tristan Koppe;H. Hofsäss;Kaushal Kumar;U. Vetter
稀土掺杂荧光粉由于其高的化学稳定性和广泛的应用前景而引起了人们的广泛兴趣。采用共沉淀法合成了Ho 3+掺杂的四硼酸钇钒纳米晶。采用X射线衍射、光致发光、阴极发光、时间分辨光谱等方法对荧光粉进行了表征。在800 nm激光激发下研究了合成荧光粉的频率上转换发光。在室温（300 K）下进行了紫外光激发光致发光（PL）和阴极射线发光（CL）测量。在370 - 600 nm处出现的宽带归因于VO43 −基团从导带到价带的弛豫。在紫外光激发下，三价钬离子在550 nm处的4f内跃迁产生了一个尖锐的吸收带，表明能量从YVO4主体转移到RE离子上.发光测试表明，该材料适用于场发射显示器（FED）和荧光灯。此外，UV辐射以及IR辐射到可见光区域的转换表明该材料在太阳能电池中用于光子收集的应用。
Rare earth doped phosphors have attracted much interest because of their high chemical durability and wide range of attractive applications. In this work, Ho3+doped tetragonal YVO4nanocrystals have been synthesized via a facile co-precipitation method. The phosphor was characterized by various methods including X-ray diffraction, photoluminescence, cathodoluminescence, time-resolved spectroscopy measurements. The frequency upconversion emission in the synthesized phosphor has been investigated under 800 nm laser excitation. UV-excited photoluminescence (PL) and cathodoluminescence (CL) measurements were performed at room temperature (300 K). A broad band which arises at ∼ 370-600 nm is attributed to the relaxation of VO43−groups from conduction band to valence band. Under UV-excitation, the presence of a sharp band at 550 nm due to the intra-4f transitions of the trivalent holmium ions suggests energy transfer from YVO4host to RE ions. Luminescence measurements show that this material is suitable for field emission displays (FED) and fluorescent lamps. Also the conversion of UV radiation as well as IR radiation into the visible region suggests the application of this material for photon harvesting in solar cells.