Influence of TiO2 Space layer on plasmon enhanced Luminescence of Ag/TiO2/NaGdF4:Er3+/Yb3+/Al3+ composite Films

Q2 Engineering Materials Research Innovations Pub Date : 2022-11-01 DOI:10.1080/14328917.2022.2141951

Piaopiao Zheng, Mingjie Chen, Haifang Zhou, Chunxia Wang, Y. Lai, Jinling Yu, Shuying Cheng

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Abstract

ABSTRACT Lanthanide-doped upconversion nanoparticles (UCNPs)have potential applications in optical and optoelectronic devices due to their novel optical properties. The surface plasmon is an effective method in improving the upconversion luminescence (UCL) properties, and it is essential to tunee the distance between the metal NPs and UCNPs for improving UCL. In this work, the Ag/TiO2/NaGdF4:Er3+/Yb3+/Al3+ composite films were fabricated, and the effect of the TiO2 layer thickness on spectral characteristics in the composite films was investigated. It is shown that the thickness of TiO2 film has a significant effect on the Ag NPs plasma resonance and fluorescence intensity. The maximum upconversion emission enhancement factors of the red and green emission were obtained for the sample with 15-nm-thickness TiO2 under the 980 nm excitation. That is mainly originated from the enhancement of the resonate energy transfer (Yb3+→Er3+) rate under the competition between non-radiative transition and local field effects.

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TiO2空间层对Ag/TiO2/NaGdF4:Er3+/Yb3+/Al3+复合薄膜等离子体增强发光的影响

镧系掺杂上转换纳米粒子(UCNPs)由于其新颖的光学特性在光学和光电子器件中具有潜在的应用前景。表面等离子体是改善上转换发光性能的有效方法，而调整金属NPs与UCNPs之间的距离是提高上转换发光性能的关键。本文制备了Ag/TiO2/NaGdF4:Er3+/Yb3+/Al3+复合薄膜，研究了TiO2层厚对复合薄膜光谱特性的影响。结果表明，TiO2薄膜的厚度对Ag NPs的等离子体共振和荧光强度有显著影响。在980 nm激发下，TiO2厚度为15 nm的样品获得了最大的上转换发射增强因子。这主要是由于在非辐射跃迁和局域场效应的竞争下，共振能量转移(Yb3+→Er3+)速率增强所致。

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来源期刊

Materials Research Innovations 工程技术-材料科学：综合

CiteScore

5.20

自引率

0.00%

发文量

审稿时长

2.8 months

期刊介绍： Materials Research Innovations covers all areas of materials research with a particular interest in synthesis, processing, and properties from the nanoscale to the microscale to the bulk. Coverage includes all classes of material – ceramics, metals, and polymers; semiconductors and other functional materials; organic and inorganic materials – alone or in combination as composites. Innovation in composition and processing to impart special properties to bulk materials and coatings, and for innovative applications in technology, represents a strong focus. The journal attempts to balance enduring themes of science and engineering with the innovation provided by such areas of research activity.