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Abstract <p>To enhance the efficiency of latent fingerprint detection, the development of nanoscale, highly stable red phosphors is essential. In this study, a series of GdPO<sub>4</sub>·H<sub>2</sub>O:12%Eu<sup>3+</sup> nanophosphors were synthesized via the hydrothermal method by adjusting the pH value. The synthesized products were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and fluorescence spectrophotometry. The results indicate that the pH value does not affect the crystal structure of the product but effectively regulates the morphology and size of the nanophosphors. The fluorescence intensity of the product gradually decreases with increasing pH. Additionally, the product exhibits excellent thermal stability. The red phosphor can clearly reveal the multilayered features of latent fingerprints and remains successfully identifiable even after 24 h of UV exposure. This study provides new insights into the development of efficient and stable rare-earth nanomaterials for fingerprint visualization.</p>

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Morphology Control, High-Temperature Fluorescence Properties, and Their Application in Fingerprint Detection of GdPO4·H2O:12%Eu3+ Nanophosphors

  • 期刊论文

  • 发表日期：

    2025年6月21日

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  • Jinxiu Wu,
  • Shengquan Wang,
  • Baolong Wu,
  • Meng Zhang,
  • Zhaogang Liu,
  • Yanhong Hu,
  • Xiaowei Zhang,
  • Jianfei Li,
  • Feng Guo,
  • Qi Lu,
  • Qianqian Zhang

摘要

Abstract

To enhance the efficiency of latent fingerprint detection, the development of nanoscale, highly stable red phosphors is essential. In this study, a series of GdPO4·H2O:12%Eu3+ nanophosphors were synthesized via the hydrothermal method by adjusting the pH value. The synthesized products were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and fluorescence spectrophotometry. The results indicate that the pH value does not affect the crystal structure of the product but effectively regulates the morphology and size of the nanophosphors. The fluorescence intensity of the product gradually decreases with increasing pH. Additionally, the product exhibits excellent thermal stability. The red phosphor can clearly reveal the multilayered features of latent fingerprints and remains successfully identifiable even after 24 h of UV exposure. This study provides new insights into the development of efficient and stable rare-earth nanomaterials for fingerprint visualization.