Ulises Ruyman Rodríguez-Mendoza

The conventional melt-quenching technique was used to fabricate trivalent erbium (Er3+)-doped sodium oxyfluorosilicate glasses. The optical absorption spectrum for 1 mol% Er2O3-doped glass is recorded, and photoluminescence spectra for different doping concentrations are measured as a function of temperature. The intensity parameters, which are used to calculate radiative transition probabilities, branching ratios, and radiative lifetimes of the excited states of Er3+ ions, are derived from the absorption spectra using the Judd-Ofelt (JO) theory. The applicability of JO analysis is proven by the good agreement between theoretical predictions and experimental results. Over a temperature range of ambient to 793K, the fluorescence intensity ratio (FIR) between the thermally coupled 2H11/2 and 4S3/2 excited states of Er3+ ions is measured. The 0.1 mol% Er2O3-doped glass showed a maximum absolute thermal sensitivity (SA-max) of 97.8310-4 K-1 at 689 K and a maximum relative sensitivity of 1.55% K-1 at 298 K. These findings are consistent with the theoretically projected values based on the JO analysis. Raising the Er2O3 concentration caused lower SA-max values due to increased ion-ion interactions and non-radiative energy transfer processes. Because of its increased thermal sensitivity and lower non-radiative losses, the 0.1 mol% Er2O3-doped sodium oxyfluorosilicate glass shows promise for high-temperature optical thermometry applications over a wide working temperature range

Optical thermometry is a modern, non‐contact technique for temperature measurements, and its performance is fundamentally determined by the thermometric parameters employed. The use of unique luminescence from some divalent lanthanide ions may significantly boost the thermometric performance of optical sensors. Here, a first luminescent thermometer based on the rarely observed UV emission of Yb ²⁺ is presented. The emitting lanthanide ions were successfully incorporated in the SrB ₄ O ₇ host, whose thermal stability was confirmed in a broad T ‐range of ≈80–420 K. The material subjected to extreme temperature conditions manifests luminescence enhancement and spectral shifts toward both higher and lower energies, depending on the T ‐range studied. This is due to the thermalization processes within the excited electronic configuration 4 f ¹³ 5 d ¹ of Yb ²⁺ , leading to distinct temperature responses of different relaxation channels. The applied multiple linear regression (MLR) analysis allows the combination of different thermometric parameters and a multiple increase of the resulting temperature sensitivity. Importantly, the proposed lifetime‐derived thermometric parameter, based on the decay‐amplitudes ratio, results in the unprecedentedly high relative temperature sensitivity of 27.64 % K ⁻¹ . This approach provides a generalizable framework for extracting temperature information from luminescence dynamics in diverse phosphors, offering a new route for constructing high‐performance optical thermometers.

Existing luminescent pressure sensors, including multi‐modal ones, rely on a single spectroscopic parameter at a time for optical readout, which limits their sensing accuracy and precision. This work presents the first example of a truly multiparametric luminescent manometer, simultaneously utilizing several parameters for optical readout—based on the photophysical analysis of Ce ³⁺ in a single‐crystal yttrium aluminum garnet (YAG) host. The band energies, intensities, bandwidths and excited‐state lifetime of the Ce ³⁺ ‐doped YAG are studied under extreme conditions (>14 GPa), to assess its potential as a new‐generation optical pressure gauge. Both conventional single‐parameter and the proposed multiparametric approaches are applied to the same dataset to evaluate its sensing performance. This new, multiparametric approach, based on multiple linear regression (MLR), led to a 50‐fold increase in relative sensitivity and a 4‐fold reduction in pressure uncertainty compared to the best single‐parameter analysis. These results demonstrate that multiparametric analysis provides significantly enhanced accuracy and reliability in pressure sensing, without requiring changes to the material or experimental setup. This methodology is readily transferable and could be applied to a wide range of luminescent materials, laying the foundation for a new generation of high‐performance optical manometers for use in high‐pressure physics, materials science, and beyond.

The rapid miniaturization of electronic devices has pushed the limits of conventional silicon‐based technologies, creating a pressing need for novel approaches to sustain the exponential growth of computing power. In this work, we present a solid‐state, organic‐inorganic hybrid material co‐doped with Eu ³ ⁺ and Tb ³ ⁺ ions as a versatile, all‐photonic platform for molecular logic operations. Exploiting the unique luminescence properties of lanthanide ions, excited by cost‐effective LED sources, this system performs multiple fundamental logic operations using exclusively physical stimuli such as excitation light and temperature. The physical nature of both logic inputs and outputs enables its reconfigurable logic behavior, allowing the construction of more complex logic circuits, including demultiplexers, HALF‐ADDERS, and HALF‐SUBTRACTORS. Moreover, this device demonstrates reversible logic operations in a fully solid‐state configuration, which represents, to the best of our knowledge, the first molecular logic system to combine lanthanide luminescence, physical inputs, and solid‐state material that performs reversible logic. This work paves the way for scalable, reusable molecular logic devices that are well‐suited for integration into next‐generation optoelectronic and photonic systems.

Pressure dependence of spectral positions of the ²E → ⁴A₂ and ⁴T₂ → ⁴A₂ bands of Cr³⁺ ions, resulting from changes in Cr³⁺-O^2- covalency and variations in crystal field strength, respectively, is commonly utilized in luminescence manometry. However, as demonstrated in this paper, the luminescence of Cr³⁺-Cr³⁺ pairs shows insensitivity to pressure changes, making this signal suitable as a luminescence reference. The significant difference in the thermal and pressure dependences of luminescence with Cr³⁺ occupying different crystallographic positions in CaAl₁₂O₁₉:Cr³⁺ enables the development of a dual-function luminescence thermometer that operates in both ratiometric and lifetime-based readout modes. The presented first demonstration on utilization of Cr³⁺-Cr³⁺ pairs luminescence for sensing applications may rekindle interest in Cr³⁺-Cr³⁺ pairs for the development of optical sensors for physical quantities.