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Correction: Luminescence properties of Bi<sup>3+</sup>/Sm<sup>3+</sup> co-doped K<sub>3</sub>Gd<sub>5</sub>(PO<sub>4</sub>)<sub>6</sub> phosphors for self-referencing optical thermometry.

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Related Experiment Video

Updated: May 30, 2026

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

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Published on: April 16, 2017

Pressure evolution of LiBaF(3):Eu(2+) luminescence.

S Mahlik¹, M Grinberg, Liang Shi

¹Institute of Experimental Physics, University of Gdansk, Wita Stwosza 57, 80-952 Gdansk, Poland.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|August 10, 2011

Summary

High pressure spectroscopy reveals changes in europium (Eu2+) luminescence in LiBaF3 crystals. Under pressure, Eu2+ emission shifts, indicating altered electronic configurations and lattice dynamics.

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Area of Science:

Solid State Physics
Materials Science
Spectroscopy

Background:

Investigating the effects of high pressure on the optical properties of doped crystals is crucial for understanding material behavior under extreme conditions.
Europium-doped materials are widely studied for their luminescent properties, with applications in lighting and lasers.

Purpose of the Study:

To explore the pressure-induced changes in the photoluminescence of Eu(2+)-doped LiBaF3 single crystals.
To analyze the transition mechanisms and lattice dynamics of Eu(2+) in LiBaF3 under high pressure.

Main Methods:

High-pressure spectroscopy using a diamond anvil cell (DAC).
Photoluminescence, time-resolved luminescence, and luminescence kinetics measurements.
Variable temperature studies from 10 K to ambient temperature.

Main Results:

At ambient conditions, luminescence showed sharp lines (360 nm) and a broad band (375-475 nm) attributed to Eu(2+) transitions and trapped exciton recombination, respectively.
Under high pressure (up to 200 kbar), the trapped exciton emission vanished, replaced by a sharper band at 355 nm corresponding to Eu(2+) transitions.
Low-temperature spectra (<50 K) consistently showed sharp Eu(2+) transition lines across all pressures.

Conclusions:

High pressure significantly alters the electronic structure and emission pathways of Eu(2+) in LiBaF3.
A model of impurity trapped excitons was developed to explain the pressure-dependent luminescence spectra.
Analysis provided insights into phonon modes and Grüneisen parameters, crucial for understanding lattice response to pressure.