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Photoluminescence: Applications01:14

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...
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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Published on: April 14, 2020

Noncoordinating Substituent Modulation Strategy Lights Up Uranyl Organic Complexes for Sensitive X-ray Detection and

Yang Yang1, Zhiyong Peng1,2, Benxian Huang1

  • 1State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou 215123, China.

Inorganic Chemistry
|May 30, 2026
PubMed
Summary

Researchers enhanced the photoluminescence quantum yield (PLQY) of uranyl organic complexes (UOCs) by over 60-fold using a novel substituent modulation strategy. This breakthrough enables highly sensitive X-ray detection and imaging applications.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Radiochemistry

Background:

  • Uranyl organic complexes (UOCs) typically show low photoluminescence quantum yield (PLQY) due to high nonradiative transition rates (k_nr).
  • This is attributed to ligand-to-uranyl energy transfer and vibrational energy dissipation in flexible structures.

Purpose of the Study:

  • To develop a strategy for enhancing the PLQY of UOCs.
  • To investigate the effect of noncoordinating substituent modulation on UOCs' electronic structure and stacking.
  • To explore the application of high-PLQY UOCs in X-ray detection and imaging.

Main Methods:

  • A noncoordinating substituent modulation strategy was employed to modify UOCs.
  • The nonradiative transition rate (k_nr) and PLQY were measured.
  • The performance of UOC 3 as an X-ray scintillator was evaluated, including spatial resolution.

Main Results:

  • The strategy significantly reduced k_nr, leading to an over 60-fold increase in PLQY (from 0.24% to 42.8%).
  • UOC 3 achieved the highest PLQY among heteroleptic UOCs.
  • A scintillator film from UOC 3 demonstrated high spatial resolution (~5 lp mm-1) for X-ray imaging.

Conclusions:

  • Noncoordinating substituent modulation is an effective strategy to boost UOCs' PLQY.
  • UOC 3 is a promising material for sensitive X-ray detection and high-resolution X-ray imaging.
  • This work opens new avenues for designing advanced luminescent materials based on UOCs.