On the luminescence of Ti⁴⁺ and Eu³⁺ in monoclinic ZrO₂: high performance optical thermometry derived from energy transfer

Abstract

The photoluminescence of Ti4+ and Eu3+ in monoclinic ZrO2 was demonstrated for optical thermometry through energy transfer from titanium–oxygen complexes to Eu3+.

Theoretical Calculations Meet Experiment to Explain the Luminescence Properties and the Presence of Defects in m-ZrO2

“…Based on conclusions from the ∆SCF calculations, the origin of luminescence at ≈2.6 eV is explained by the charge transfer (CT) from Ti impurities substituting zirconium, in the lines of previous works. 24 Indeed, we demonstrated the de-excitation from Ti electronic states is characterized by an energy transition of 2.61 eV.…”

“…23 Another experimental study by Pan et al concluded the charge transfer Ti 3+ + O -→ Ti 4+ + O 2could indeed be the main cause. 24 From the theoretical side, Density Functional Theory (DFT) is usually used for inorganic solids in optics to determine band gaps, identify electronic transitions at work in a given material and get access to the complex refractive indexes. More recently, DFT has been employed to provide information on charge transition levels within the bandgap, [25][26][27][28][29][30][31][32][33][34][35] enabling one to characterize the presence and the nature of defects in the studied structure.…”

Strong sensitivity enhancement in lifetime-based luminescence thermometry by co-doping of SrTiO3:Mn4+ nanocrystals with trivalent lanthanide ions

“…The LIR technique is faster to operate, simpler, and requires less sophisticated instrumentation than the lifetime method. [20][21][22][23][24][25][26][27] However, one of the major LIR shortcomings is related to the effect of spectral heterogeneity of the transmittance of the measuring medium which may lead to a change in the shape of the luminescence spectrum and thus an erroneous temperature readout. [28][29][30] This effect does not occur in luminescent thermometers based on the lifetime of the excited level.…”

Demonstration of temperature-sensitive paints with rigorously controlled thickness applied to variously shaped metal substrates with a highly stable connection based on a demulsification-induced fast solidification strategy

“…1,2 Along these lines, the fabrication of noncontact thermometers based on luminescent temperature-sensitive materials has been proposed as a promising alternative due to their excellent spatial and temporal resolution properties, enhanced sensitivity, noninvasiveness, and simplicity, while they can also be competently used in various applications including remote detection, fast-moving objects, strong electromagnetic fields, corrosive environments, and biological fluids. 1–3,11–19 It is interesting to note that temperature-sensitive paints (TSPs) composed of both luminescent molecular probes and polymer matrices are widely employed for non-contact temperature measurements on solid surfaces, in the air of wind tunnel tests and in aerodynamics studies. In addition, there are reports in the literature regarding their implementation for carrying out droplet–substrate interface temperature and interfacial heat transfer measurements, as well as detection of the temperature distribution within gas–liquid two-phase flows based on the principle of temperature quenching, since they display the features of fast response and execution of contactless measurements.…”