Optical, structural and fluorescence properties of nanocrystalline cubic or monoclinic Eu:Lu2O3 films prepared by pulsed laser deposition
Optical, structural and fluorescence properties of nanocrystalline cubic or monoclinic Eu:Lu2O3 films prepared by pulsed laser deposition
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DOI：
10.1016/j.jlumin.2006.10.032
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发表时间：
2007-10-01
影响因子：
3.6
通讯作者：
Garapon, C.
中科院分区：
文献类型：
--
作者：
Martinet, C.;Pillonnet, A.;Garapon, C.
采用脉冲激光沉积法在熔融石英衬底上制备了Eu：Lu2O3纳米晶薄膜。取决于沉积条件（氧气压力，温度和激光能量），薄膜的结构从非晶转变为结晶和立方或单斜相得到不同的优先取向和微晶尺寸。单斜相首次可以在低至240 ℃的温度和较窄的参数范围内制备。虽然这一阶段以前已报告粉末样品，它只发生在高压和高温制备条件。通过m线光谱测量两个晶相的折射率，并通过Sellmeier表达式拟合其色散曲线。特定的Eu 3+荧光特性的不同阶段，单斜晶系和立方晶系，登记和显示修改由于纳米尺寸的微晶，特别强调的准选择性激发的电荷转移带中引起的混乱。(c)2007 Elsevier B.V.保留所有权利。
Eu3+-doped lutetium oxide (Eu:Lu2O3) nanocrystalline films were grown on fused-silica substrates by pulsed laser deposition. Depending on deposition conditions (oxygen pressure, temperature and laser energy), the structure of the films changed from amorphous to crystalline and the cubic or monoclinic phases were obtained with varying preferential orientation and crystallite size. The monoclinic phase could be prepared for the first time at temperatures as low as 240 C and in a narrow range of parameters. Although this phase has been previously reported for powder samples, it occurs only for high pressures and high temperatures preparation conditions. The refractive indices were measured by m-lines spectroscopy for both crystalline phases and their dispersion curve fitted by the Sellmeier expression. The specific Eu3+ fluorescence properties of the different phases, monoclinic and cubic, were registered and show modifications due to the disorder induced by the nanometric size of the crystallites, emphasised in particular by quasi-selective excitation in the charge transfer band. (c) 2007 Elsevier B.V. All rights reserved.