相关实验视频

Updated: May 27, 2025

Author Spotlight: Advancing Bioimaging and Therapy with Functional Nanomaterials

Author Spotlight: Advancing Bioimaging and Therapy with Functional Nanomaterials

Published on: September 13, 2024

探索Sr₂Ga₂GeO₇:Tb³⁺ 长时间持久发光,用于隐藏指纹检测和防伪应用中的尖端法医解决方案

Irfan Ayoub¹, Umer Mushtaq¹, Govind B Nair²

¹Department of Physics, National Institute of Technology Srinagar, Hazratbal, Jammu and Kashmir, 190006, India.

Small (Weinheim an der Bergstrasse, Germany)

|February 16, 2025

概括

新的基基基酸含有terbium的基酸显示出长期持久的绿色持久发光. 这些材料具有出色的热稳定性,在隐藏指纹检测和防伪方面具有潜在的应用.

科学领域:

固态化学和材料科学固态化学和材料科学
发光和光物理学的发光.

背景情况:

持久发光 (PL) 材料对于各种光学应用至关重要,包括照明,显示器和安全.
用稀土离子合的三极生殖物提供可调节的光学性能和增强PL的潜力.

研究的目的:

为了合成和描述新的Sr2-xGa2GeO7:x Tb3+.
研究合成材料的持久发光特性和热稳定性.
探索潜伏指纹检测和防伪的潜在应用.

主要方法:

用于合成的高温固态反应.
用X射线粉碎衍射 (XRD) 和瑞特维尔德精细化进行结构分析.
光谱技术 (反射,光发光激发,发射) 用于光学表征.
动力扫描,余光测量和热发光 (TL) 用于PL属性评估.
对高达675K的热稳定性进行评估.

主要成果:

成功合成了Sr2-xGa2GeO7:x Tb3+体,其直接带隙为4.99 eV.
由于Tb3+离子的5D4 → 7F5过渡,观察到占主导地位的绿色辐射.
长持续发光寿命 (≈7000秒) 和后照持续时间 (高达100秒) 实现.
增强的PL特性归因于兴奋剂诱导的内在,间歇性和空缺缺陷.
证明了高达675K的热稳定性,适用于隐性指纹检测和防伪.

结论:

Sr2-xGa2GeO7:x Tb3+是持续发光应用的有希望的材料.
兴奋剂策略有效调整缺陷结构以改善发光特性.
合成的体显示出安全和法医应用的实际可行性.

关键词:

之后的光之后的光打击假冒和伪造的行为.绿色排放的绿色排放隐藏的指纹隐藏的指纹持续的发光持续的发光陷陷是一个陷.

更多相关视频

Preparation and Application of a New Bacterial Biosensor for the Presumptive Detection of Gunshot Residue

Preparation and Application of a New Bacterial Biosensor for the Presumptive Detection of Gunshot Residue

Published on: May 9, 2019

Blue-hazard-free Candlelight OLED

Blue-hazard-free Candlelight OLED

Published on: March 19, 2017

相关概念视频

Photoluminescence: Applications

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

Labeling DNA Probes

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...