Wydział Chemii

Teng Zheng

Marcin Runowski

Plácida Rodríguez-Hernández

Alfonso Muñoz

Francisco J. Manjón

Małgorzata Sójka

Markus Suta

Eugeniusz Zych

Stefan Lis

Víctor Lavín

2022

Acta Materialia

231

117886/1-117886/15

10.1016/j.actamat.2022.117886

Naukowa

Angielski

Artykuł

Accurate, fast, and non-invasive methods for the determination of the local pressure magnitude are crucial for the investigation of the physical and chemical behavior of materials at the extreme conditions of high pressure. A promising method for remote operando pressure measurements is luminescence manometry. However, a limiting bottleneck for high-pressure readout is the usually occurring quenching of the emission signal of the luminescent sensor material upon compression. In this work, we reported for the first time the pressure-induced intensity enhancement (by 3 orders of magnitude) of the 4f⁷(⁶P_7/2)→4f⁷ (⁸S_7/2) emission line of Eu²⁺ in the UV range due to pressure-induced configurational crossover between the excited 4f⁶5d¹ and 4f⁷ energy levels in SrB₄O₇ host. The peak centroid of the narrow 4f⁷ → 4f⁷ transition exhibits a significant red-shift (∼ -12.84 cm⁻¹ GPa⁻¹; 0.17 nm GPa⁻¹) with simultaneous temperature independence of the line position (4.8·10⁻⁴ nm K⁻¹). The pressure sensitivity of the proposed system is competitive to the so far well-established luminescent pressure sensors based on Al₂O₃:Cr³⁺ (ruby) and SrB₄O₇:Sm²⁺ with characteristic narrow line emission in the red range, and offers an alternative spectral range in parallel with an intensity enhancement at higher pressures. This novel pressure gauge may significantly improve the accuracy of the remote pressure measurements and open up new horizons for materials science research at even higher pressures.

Pressure-enhanced emission, 4f7 → 4f7 emission of Eu2+, Strontium tetraborate, optical pressure gauge, luminescent manometer, pressure-induced crossover

http://dx.doi.org/10.1016/j.actamat.2022.117886

http://www.elsevier.com