Novel Orange-Emitting YPO4:Sm3+/Polymer Nanocomposite Phosphor Films for LED Applications

IF 2.6 4区 化学 Q2 BIOCHEMICAL RESEARCH METHODS
Lamine Mebarki, Badis Kahouadji, Abdelhalim Zoukel, Lyes Benharrat, Jai Prakash, Salim Ouhenia, Abdelhafid Souici, Maxime Delaey, Lakhdar Guerbous, Dirk Poelman, Hendrik C. Swart
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引用次数: 0

Abstract

A polymer based nanocomposite (NC) material embedded with highly luminescent nanopowders could be promising for replacing traditional luminescent materials from a technological point of view. In this study, we have successfully obtained YPO4: Sm3+ /Polymer nanocomposite phosphor films by embedding YPO4: Sm3+ luminescent nanoparticles (NPs) for orange-light emitting diode (LED) applications. These luminescent NPs were synthesized using the sol gel method in different polymer matrices i.e. polystyrene (PS) and poly (methyl methacrylate) (PMMA) by using direct solution mixing. The structural, morphological, and photoluminescence characteristics of the nano-phosphors and resulting NC films were examined and discussed. The emission spectra of YPO4: Sm3+ (x at.%) nano-phosphors under near-UV excitation at 404 nm were dominated by orange emission attributed to 6H5/2 \(\rightarrow\) 4F7/2 (601 nm) luminescence of Sm3+ ions. The optimum doping concentration of activator Sm3+ in YPO4 matrix was found to be 5 at.%. When the doping concentration of Sm3+ was higher than 5 at.%, concentration quenching occurred. The incorporation of YPO4: Sm3+ NPs into polymer matrices indicated that the NCs retained the original luminescence properties of the luminescent NPs, although a decrease in their emission intensity was observed for the NC films, attributable to a polymer matrix effect, which dominated in PS matrix. The fluorescence decay times of NPs in the NC films were measured and compared to those of proper YPO4: Sm3+ nano-phosphors. A decrease in decay time in NC film was observed due the effective refractive index effect. Temperature-dependent photoluminescence (TDPL) of PMMA NC film was studied in 100–400 K range, investigating the thermal stability of the film. Additionally, CIE coordinates confirmed the red–orange light emission of the prepared phosphors and NC films. The obtained results indicate that the synthesized polymer-nanophosphor NC films are promising candidates for orange-LED applications.

Abstract Image

用于 LED 应用的新型橙色发光 YPO4:Sm3+/Polymer 纳米复合荧光粉薄膜
从技术角度看,嵌入高发光纳米粉体的聚合物基纳米复合材料(NC)有望取代传统的发光材料。在这项研究中,我们通过嵌入 YPO4:Sm3+ 发光纳米粒子(NPs),成功获得了 YPO4:Sm3+/聚合物纳米复合荧光粉薄膜,并将其应用于橙色发光二极管(LED)。这些发光 NPs 是采用溶胶凝胶法在不同的聚合物基质(即聚苯乙烯(PS)和聚甲基丙烯酸甲酯(PMMA))中通过直接溶液混合合成的。研究并讨论了纳米磷和所制得的 NC 薄膜的结构、形态和光致发光特性。YPO4: Sm3+ (x at.%)纳米磷在404 nm近紫外激发下的发射光谱以Sm3+离子的6H5/2 \(\rightarrow\) 4F7/2 (601 nm)发光的橙色发射为主。研究发现,YPO4 基体中活化剂 Sm3+ 的最佳掺杂浓度为 5%。当 Sm3+ 的掺杂浓度高于 5 at.% 时,会出现浓度淬灭现象。将 YPO4:Sm3+ NPs 掺入聚合物基质中的结果表明,NCs 保留了发光 NPs 的原有发光特性,但 NC 薄膜的发射强度有所下降,这归因于聚合物基质效应,而在 PS 基质中,聚合物基质效应占主导地位。测量了 NC 薄膜中 NPs 的荧光衰减时间,并将其与适当的 YPO4:Sm3+ 纳米磷酸盐的荧光衰减时间进行了比较。由于有效折射率效应,NC 薄膜中的衰减时间缩短了。研究了 PMMA NC 薄膜在 100-400 K 范围内的温度依赖性光致发光(TDPL),考察了薄膜的热稳定性。此外,CIE 坐标还证实了所制备的荧光粉和 NC 薄膜的红橙色光发射。结果表明,合成的聚合物-纳米荧光粉 NC 薄膜有望应用于橙色发光二极管。
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来源期刊
Journal of Fluorescence
Journal of Fluorescence 化学-分析化学
CiteScore
4.60
自引率
7.40%
发文量
203
审稿时长
5.4 months
期刊介绍: Journal of Fluorescence is an international forum for the publication of peer-reviewed original articles that advance the practice of this established spectroscopic technique. Topics covered include advances in theory/and or data analysis, studies of the photophysics of aromatic molecules, solvent, and environmental effects, development of stationary or time-resolved measurements, advances in fluorescence microscopy, imaging, photobleaching/recovery measurements, and/or phosphorescence for studies of cell biology, chemical biology and the advanced uses of fluorescence in flow cytometry/analysis, immunology, high throughput screening/drug discovery, DNA sequencing/arrays, genomics and proteomics. Typical applications might include studies of macromolecular dynamics and conformation, intracellular chemistry, and gene expression. The journal also publishes papers that describe the synthesis and characterization of new fluorophores, particularly those displaying unique sensitivities and/or optical properties. In addition to original articles, the Journal also publishes reviews, rapid communications, short communications, letters to the editor, topical news articles, and technical and design notes.
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