Understanding the power of luminescence ratiometric thermal history indicators driven by phase transitions: the case of Eu³⁺ doped LaVO₄

Abstract

Finding thermal history phosphors with high sensitivity and a consistent readout is required for reliable thermal history determination with high temperature resolution. This work presents a new thermal history phosphor...

Unveiling the Potential of Sunlight‐Driven Multifunctional Blue Long Persistent Luminescent Materials via Cutting‐Edge Trap Modulation Strategies

“…To investigate the influence of rare earth ion doping on the bandgap of samples, a combined theoretical and experimental analysis band structure of the samples were conducted using Density Functional Theory (DFT) and UV‐Visible Diffuse Reflectance Spectroscopy (DRS). The DRS test results in Figure S7a (Supporting Information) indicate that the bandgap of the sample decreased from 5.25 to 5.11 eV after doping, as calculated using the provided formula [ 52 ] : $$$$\begin{equation}{\left( {\alpha h\nu } \right)}^{\mathrm{n}} = A\left( {h\nu - {{\mathrm{E}}}_{\mathrm{g}}} \right)\end{equation}$$$$ $$$$\begin{equation}\alpha = \frac{{{{\left( {1 - {\mathrm{R}}} \right)}}^2}}{{2{\mathrm{R}}}}\end{equation}$$$$…”

“…To investigate the influence of rare earth ion doping on the bandgap of samples, a combined theoretical and experimental analysis band structure of the samples were conducted using Density Functional Theory (DFT) and UV-Visible Diffuse Reflectance Spectroscopy (DRS). The DRS test results in Figure S7a (Supporting Information) indicate that the bandgap of the sample decreased from 5.25 to 5.11 eV after doping, as calculated using the provided formula [52] :…”

“…Consequently, more effective level transitions during the luminescence process are achieved. [41,52]…”

Solid-Emission-Tunable Squaraine with Thermal-Promoted Aggregate-State Transitions for Fast Thermal History Sensing

“…The determination of thermal-exposure history is of critical importance for many industrial processes in aeronautical science, automobile engineering, and electronic materials, where temperature is a key parameter for design, control, and durability. − Various strategies have been employed to track the thermal history, such as irreversible thermochromic coatings that undergo sublimation or chemical reactions at elevated temperatures with distinct color changes. − Luminescent materials with high spatial and temporal resolutions are more sensitive to temperature changes − and can uncover the thermal history more precisely, assisting the detection of localized overheating traces, which are crucial for diagnosing small electronic component malfunctions . Most reported luminescent thermal history indicators are based on inorganic materials, such as rare earth elements, which are only suitable for detecting ultrahigh temperatures of up to 1000 K and require long exposure times for luminescence response due to their structural rigidity. − By comparison, organic materials offer structural diversity, less toxicity, and low cost; however, most organic materials suffer from significant emission quenching at high temperatures due to thermal-promoted nonradiative relaxations, − limiting their applications in recording high-temperature thermal history.…”