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Size-dependent abnormal thermo-enhanced luminescence of ytterbium-doped nanoparticles
Nanoscale ( IF 5.8 ) Pub Date : 2017-08-23 00:00:00 , DOI: 10.1039/c7nr04575a Xiangshui Cui 1, 2, 3, 4, 5 , Yao Cheng 1, 2, 3, 4, 5 , Hang Lin 1, 2, 3, 4, 5 , Feng Huang 1, 2, 3, 4, 5 , Qingping Wu 1, 2, 3, 4, 5 , Yuansheng Wang 1, 2, 3, 4, 5
Nanoscale ( IF 5.8 ) Pub Date : 2017-08-23 00:00:00 , DOI: 10.1039/c7nr04575a Xiangshui Cui 1, 2, 3, 4, 5 , Yao Cheng 1, 2, 3, 4, 5 , Hang Lin 1, 2, 3, 4, 5 , Feng Huang 1, 2, 3, 4, 5 , Qingping Wu 1, 2, 3, 4, 5 , Yuansheng Wang 1, 2, 3, 4, 5
Affiliation
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Thermal quenching above 300 K is widely expected in photoluminescence. Luminescence quenching is usually ascribed to the non-radiative relaxation of excited electrons to the ground state of the activators, during which a high temperature always plays a role in pushing the excited electrons towards the quenching channels, leading to thermal quenching. For the lanthanide-doped nanoparticles, however, there is a special luminescence quenching channel that does not exist in their bulk counterparts, i.e., energy migration-induced surface quenching. Herein, a size-dependent abnormal thermal enhancement of luminescence in the temperature range of 300 K to 423 K in the ytterbium-doped fluoride nanoparticles is presented for the first time. Importantly, in this work, we originally demonstrate that the energy migration-induced surface quenching can be suppressed by increasing temperature, which results in the abnormal thermal enhancement of luminescence. According to the temperature-dependent X-ray diffraction and lifetime analyses, an underlying mechanism based on the effect of thermal lattice expansion on ytterbium-mediated energy migration is proposed. This new finding adds new insights to the size effect on the luminescent characteristics of nanoparticles, which could be utilized to construct some unique nanostructures, especially for many important temperature-related purposes, such as thermal sensing technology.
中文翻译：
掺杂纳米粒子的尺寸依赖性异常热增强发光
广泛预期在光致发光中高于300 K的热淬灭。发光猝灭通常归因于激发电子向活化剂基态的非辐射弛豫，在此期间，高温始终起着将激发电子推向猝灭通道的作用，从而导致热猝灭。但是，对于掺杂镧系元素的纳米粒子，存在一个特殊的发光猝灭通道，而该通道在它们的整体对应物中不存在，即，能量迁移引起的表面淬火。在此，首次提出了掺fluoride氟化物纳米颗粒在300 K至423 K的温度范围内发光的尺寸依赖性异常热增强。重要的是，在这项工作中，我们最初证明了可以通过提高温度来抑制能量迁移引起的表面淬火，从而导致异常的发光热增强。根据与温度有关的X射线衍射和寿命分析，提出了基于热晶格膨胀对expansion介导的能量迁移的影响的潜在机理。这一新发现为纳米粒子发光特性的尺寸效应增加了新见解，可用于构建一些独特的纳米结构，
更新日期：2017-09-21
中文翻译：
掺杂纳米粒子的尺寸依赖性异常热增强发光
广泛预期在光致发光中高于300 K的热淬灭。发光猝灭通常归因于激发电子向活化剂基态的非辐射弛豫，在此期间，高温始终起着将激发电子推向猝灭通道的作用，从而导致热猝灭。但是，对于掺杂镧系元素的纳米粒子，存在一个特殊的发光猝灭通道，而该通道在它们的整体对应物中不存在，即，能量迁移引起的表面淬火。在此，首次提出了掺fluoride氟化物纳米颗粒在300 K至423 K的温度范围内发光的尺寸依赖性异常热增强。重要的是，在这项工作中，我们最初证明了可以通过提高温度来抑制能量迁移引起的表面淬火，从而导致异常的发光热增强。根据与温度有关的X射线衍射和寿命分析，提出了基于热晶格膨胀对expansion介导的能量迁移的影响的潜在机理。这一新发现为纳米粒子发光特性的尺寸效应增加了新见解，可用于构建一些独特的纳米结构，
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