Ultrasensitive optical thermometry using Tb³⁺ doped NaSrGd(MoO₄)₃ based on single band ratiometric luminescence

Abstract

A single-band ratiometric luminescent thermometer based on the green emission of Tb3+.

Dual-mode optical ratiometric thermometry using Pr3+-doped NaSrGd(MoO4)3 phosphors with tunable sensitivity

“…The calculated value for the gap energy was determined to be 3.71 eV, which is similar to our previously reported values in the NSGM:Tb 3+ phosphor. 17 This result indicates that there is no significant change in the band gap energy when Pr 3+ ions are incorporated into the NSGM host matrix. 17…”

“…11–15 On the other hand, single-band ratiometric (SBR) thermometry has recently received considerable attention, as it employs a single optically active center that is excited in two different ways to produce emission signals with opposite temperature dependencies. 16–18 This approach offers several advantages, such as collecting emissions in a single spectral range to avoid the deleterious effects of selective absorption by the tested medium, eliminating the need for spectral separation of signals used for temperature estimation in conventional ratiometric approaches, and many others. Most reported SBR luminescent thermometers to date utilize lanthanides (Tb 3+ , Eu 3+ , or Nd 3+ ), which have well defined and complex energy level schemes that enable successful temperature measurements within the SBR approach.…”

“…Tb 3+ is currently used in optical thermometry using the SBR method. 17,19,20 Praseodymium (Pr 3+ ) is a trivalent lanthanide ion that has the potential to be a promising candidate for SBR luminescence thermometry in the red or yellow range. This is because it has a favorable energy-level diagram and a high probability of cross-relaxation, which can affect its luminescence intensity.…”

Color-tunable emissions realized by Tb3+ to Eu3+ energy transfer in ZnGdB5O10 under near-UV excitation

“…The most intense emission line observed in the green region (∼542 nm) can be assigned to the transitions from the 5 D 4 to 7 F 5 level and the relatively weaker emission lines around 487, 587 and 623 nm originate from the 5 D 4 to 7 F 6 , 7 F 4 and 7 F 3 transitions, respectively. 27,28 The overall emission intensity increases with the Tb 3+ concentration and reaches the maximum value when x = 0.80, and then emission quenching is detected. A similar tendency in the emission intensity is observed when excited at 213 nm as shown in Fig.…”

Ba2YV3O11 Er3+/Yb3+ Nanostructures for Temperature Sensing in the Presence of Bismuth Ions

“…The FIR method proves to be an outstanding parameter for temperature measurement within a sensing medium. This is primarily attributed to its immunity to spectral attenuation or fluctuations in emission intensities. − Lanthanide-doped UC particles with near near-infrared (NIR) light excitation have been extensively studied as promising candidates for the FIR technique in subcutaneous and intracellular thermometry due to their advantages of tunable size, deep tissue penetration, minimal photodamage, and background autoluminescence. − Among rare-earth ion-doped UC luminescence materials, the Er 3+ /Yb 3+ pair is perhaps the most prevalent because of the Er 3+ ( 2 H 11/2 , 4 S 3/2 ) well-known thermally coupled excited states. , As host materials, materials with low phonon energy, such as fluorides, are often used in order to inhibit nonradiative processes and achieve efficient UC luminescence . However, the low physicochemical stability of fluorides, particularly at high temperatures, limits their use in temperature-sensor technologies.…”