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Photoluminescence: Applications

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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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Updated: Aug 25, 2025

Low-energy Cathodoluminescence for OxyNitride Phosphors

Low-energy Cathodoluminescence for OxyNitride Phosphors

Published on: November 15, 2016

Bright UV-C Phosphors with Excellent Thermal Stability-Y_1-ScPO₄ Solid Solutions.

Dmitry Spassky^1,2, Andrey Vasil'ev¹, Vitali Nagirnyi²

¹Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Leninskiye Gory 1-2, 119991 Moscow, Russia.

Materials (Basel, Switzerland)

|October 14, 2022

Summary

Scandium-doped YPO4 solid solutions exhibit thermally stable UV-C emission. Scandium clusters enhance luminescence quantum yield and stability, making them promising for optoelectronic applications.

Keywords:

ScPO4 UV-C phosphor YPO4 bandgap energy transfer luminescence thermal stability self-trapped exciton luminescence solid solution

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Last Updated: Aug 25, 2025

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Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

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Published on: November 10, 2017

Area of Science:

Solid-state chemistry
Luminescence and photophysics
Materials science

Background:

Understanding the luminescence properties of rare-earth-free materials is crucial for developing new optical technologies.
Yttrium phosphate (YPO4) is a promising host material, but its luminescence characteristics can be tuned by doping.
Scandium (Sc) doping in YPO4 offers potential for novel emission properties.

Purpose of the Study:

To investigate the structural and luminescence properties of undoped YPO4 doped with Scandium (Sc).
To explore the relationship between Sc concentration and emission characteristics.
To elucidate the mechanism behind the observed luminescence and its thermal stability.

Main Methods:

Synthesis and characterization of Y1-xScxPO4 solid solutions.
Optical spectroscopy to measure luminescence properties (emission spectra, decay times, quantum yield).
Combined theoretical and experimental analysis to understand defect formation and energy transfer.

Main Results:

Intense, thermally stable UV-C emission was observed, with emission band position tunable from 5.21 to 5.94 eV based on Sc/Y ratio.
Fast emission decay time (τ1/e ~ 10^-7 s) was detected and attributed to 2p O-3d Sc self-trapped excitons.
Maximum quantum yield of 34% for UV-C emission was achieved at 300 K for Y0.5Sc0.5PO4, with Sc cluster formation identified as key.

Conclusions:

Scandium clusters in Y1-xScxPO4 create energy wells, enabling deep localization of electronic excitations.
These localized excitations form luminescence centers with high quantum yield and excellent thermal stability.
The findings highlight the potential of Sc-doped YPO4 for applications requiring stable UV-C light sources.