Lab

Condensed Matter Spectroscopy Division


About the lab

Our research interests cover a wide range of condensed phase spectroscopy problems including various areas of solid state physics, photophysics and photochemistry.
The scientific experience concerns experimental physics of optoelectronics and laser materials especially dielectric lattice doped with lanthanide and transition metal ions.
Research focuses on optical spectroscopy at extreme conditions as high hydrostatic pressure and low temperatures.

Featured research (151)

Near‐infrared (NIR) emitting phosphors draw much attention because they show great applicability and development prospects in many fields. Herein, a series of inverse spinel‐type structured LiGa5O8 phosphors with a high concentration of Cr³⁺ activators is reported with a dual emission band covering NIR‐I and II regions. Except for strong ionic exchange interactions such as Cr³⁺−Cr³⁺ and Cr³⁺ clusters, an intervalence charge transfer (IVCT) process between aggregated Cr ion pairs is proposed as the mechanism for the ~1210 nm NIR‐II emission. Comprehensive structural and luminescence characterization points to IVCT between two Cr³⁺ being induced by structural distortion and further enhanced by irradiation. Construction of the configurational energy level diagram enabled elucidation of this transition within the IVCT process. Therefore, this work provides insight into the emission mechanism within the high Cr³⁺ concentration system, revealing a new design strategy for NIR‐II emitting phosphors to promote its response.
Accurate, rapid, and remote detection of pressure, one of the fundamental physical parameters, is vital for scientific, industrial, and daily life purposes. However, due to the limited sensitivity of luminescent manometers, the optical pressure monitoring has been applied mainly in scientific studies. Here, we developed the first supersensitive optical pressure sensor based on the exciton-type luminescence of the Bi3+-doped, double perovskite material Cs2Ag0.6Na0.4InCl6. The designed luminescent manometer exhibits an extremely high sensitivity, i.e. dλ/dp = 112 nm GPa-1. It also allows multi-parameter sensing, using both blue-shift and rarely observed band narrowing with pressure. Importantly, this material has small temperature dependence for the manometric parameter used, i.e. spectral shift, allowing detection under extreme pressure and temperature conditions. The developed sensor operates in the visible range, and its emission shifts from orange to blue with pressure. This approach allowed us to demonstrate the real-world application of this sensor in detecting small changes in pressure with a designed uniaxial pressure device, with unprecedented resolution of the order of a few bars, demonstrating the technological potential of this sensor for remote, online monitoring of cracks and strains in heavy construction facilities.
In this study, we synthesized a series of Ga1.98–xInxO3:0.02Cr³⁺ materials with varying x values from 0.0 to 1.0, focusing on their broadband near-infrared emission and photoelectric properties. Interestingly, photocurrent excitation spectra exhibited behavior consistent with the absorption spectra, indicating the promotion of carriers into the band structure by the ⁴T1, and ⁴T2 states of Cr³⁺ ions. This association suggests that photocurrent in this material is influenced not only by valence to conduction band transitions but also by transitions involving Cr³⁺ dopants. Our investigation of luminescence quenching mechanisms revealed that nonradiative processes were not directly linked to thermally induced relaxation from the excited state ⁴T2 to the ground state ⁴A2, as usually suggested in the literature for this type of material. Instead, we linked it to the thermal ionization of Cr³⁺ ions. Unexpectedly, this process is unrelated to the transfer of electrons from Cr³⁺ impurities to the conduction band but is associated with the formation of holes in the valence band. This study provided novel evidence of luminescence quenching via the hole-type thermal quenching process in Cr³⁺-doped oxides, suggesting potential applicability to other transition metal ions and host materials. Finally, we demonstrated the dual-purpose nature of Ga1.98–xInxO3:0.02Cr³⁺ as a practical emitter for NIR-pc-LEDs and effective photocurrent for UV detectors. This versatility underscores these materials’ practicality and broad application potential in optoelectronic devices designed for near-infrared and ultraviolet applications.
This paper explores the connection between the H 3 BO 3 flux concentration and the co-existence of Eu ²⁺ and Eu ³⁺ dopants within CaMgSi 2 O 6 crystals (diopside). The samples were synthesised using a solid-state synthesis...

Lab head

Sebastian Mahlik
Department
  • Department of Experimental Physics

Members (10)

Justyna Barzowska
  • University of Gdansk
Tadeusz Lesniewski
  • University of Gdansk
Karol Szczodrowski
  • University of Gdansk
Agata Lazarowska
  • University of Gdansk
Natalia Majewska
  • University of Gdansk
Dawid Jankowski
  • Nicolaus Copernicus University
Maciej Grzegorczyk
  • University of Gdansk
Mikołaj Kamiński
  • University of Gdansk
Natalia Górecka
Natalia Górecka
  • Not confirmed yet