Green, red, and near-infrared up-conversion emission of NaY(MoO4)2:Er3+ submicrometric particles obtained by one-step synthesis, and its thermometric application
Green, red, and near-infrared up-conversion emission of NaY(MoO4)2:Er3+ submicrometric particles obtained by one-step synthesis, and its thermometric application
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DOI：
10.1016/j.jlumin.2021.118639
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发表时间：
2021-11
影响因子：
3.6
通讯作者：
D. L. Silva;Roberta S. Pugina;José Maurício Almeida Caiut
中科院分区：
文献类型：
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作者：
D. L. Silva;Roberta S. Pugina;José Maurício Almeida Caiut
将红外辐射转换为可见光辐射的基于镧系离子的非线性光学过程是众所周知的。这些工艺已被用于生产用于电信、生物成像系统、固态激光器、温度传感器、显示器和太阳能电池的光学放大器的高效光子器件。在这里，我们采用喷雾热解一步法制备了掺杂0.5%、1%、2%、5%、10%、15%和20%(摩尔/摩尔，Er3+/Y3+)的亚微米球形NaY(MoO4)2：Er3+，并研究了上转换发光与基质中稀土离子含量的关系。用X射线衍射仪、傅里叶变换红外光谱、透射电子显微镜和发光光谱对样品进行了表征，证实得到了微米级和亚微米级的球形颗粒。所有样品均为四方结构，空间群为I41/a。在980 nm和1550 nm激发下的上转换研究分别证实了双光子和三光子机制。发光行为取决于Er3+的含量，材料在绿色、红色和近红外区域发射光子。此外，Er~(3+)的掺杂量可以调节发光。接下来，我们研究了材料的上转换行为作为温度的函数。光谱表明，热耦合能级(2H11/2和4S3/2)的积分强度发射与温度呈线性关系。这里得到的颗粒可能是太阳能电池、生物成像系统和发光测温设备的有用增感剂。
Lanthanide ion-based nonlinear optical processes for conversion of infrared radiation to visible radiation are well known. These processes have been used to produce efficient photonic devices for optical amplifiers in Telecom, bioimaging systems, solid-state lasers, temperature sensors, displays, and solar cells. Here, we obtained submicrometric spherical NaY(MoO4)2:Er3+particles doped at 0.5, 1, 2, 5, 10, 15, and 20% (mol/mol, Er3+/Y3+ions) by spray pyrolysis in one step, and we studied up-conversion emission as a function of the lanthanide ion content in the matrix. Characterization of the samples by XRD, FTIR, TEM, and luminescence spectroscopy confirmed that spherical particles with micro- and submicrometric diameters were produced. All the samples had tetragonal structure with space group I41/a. The up-conversion studies performed upon excitation at 980 and 1550 nm confirmed a two- and three-photon mechanism, respectively. The emission behavior depended on the Er3+content, and the materials emitted photons in the green, red, and NIR region. In addition, color emission could be tuned by the Er3+content. Next, we studied the up-conversion behavior of the materials as a function of temperature. Spectroscopy showed that the integrated intensity emission from thermally coupled levels (2H11/2and4S3/2) depended linearly on temperature. The particles obtained here could be useful sensitizers for solar cells, bioimaging systems, and luminescent thermometry devices.