The use of LEDs as a light source for fluorescence pressure measurements

ABSTRACT

We discuss the use of commercial high power light emitting diodes (LEDs) as a light source for fluorescence pressure measurements. The relatively broad light emitting spectra of single color LEDs (in comparison with lasers) do not prevent producing narrow fluorescence lines at least for two widely used pressure indicator materials, namely ruby (${\text{Cr}}^{3+}:{\text{Al}}_2{\text{O}}_3$) and strontium tetraborate (${\text{Sm}}^{2+}:{\text{SrB}}_4{\text{O}}_7$). Strongest responses of both pressure gauges were detected for the green color LEDs with the average wavelength ${\lambda }_{\mathrm{a}\mathrm{v}}\sim 530\text{nm}$. LEDs might be easily implemented for producing fiber-coupled, as well as the parallel light sources. LEDs were found to be efficient to replace laser sources in piston-cylinder cell and diamond anvil cell fluorescence pressure measurement setups.

KEYWORDS:

• Light-emitting diodes
• fluorescence
• diamond anvil pressure cell
• piston-cylinder pressure cell

Acknowledgments

The experiments were performed at the muon lab (LMU, PSI, Switzerland) and the Sorbonne University. The work was partially supported within the framework of ‘ExtremeP’ R'Equip project. RK acknowledges helpful discussions at the LMU lab seminar. SK acknowledges assistance by K. Béneut and F. Datchi (IMPMC).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.