Blue-light pumped NIR emission of LaOF:Pr3+ nanorods for highly sensitive nanothermometry

Praseodymium-Doped Nanoparticles: Candidates for Near-Infrared-II Double- and Single-Band Nanothermometry

“…0.5% K –1 was obtained at 15 K, rendering the NPs suitable for dual-band NIR nanothermometry in the cryogenic regime. Tamboli et al proposed a double-band approach based on the nonthermally coupled 3 P 0 → 1 G 4 (994 nm) and 1 G 4 → 3 H 5 (1306 nm) transitions of Pr 3+ with maximum S r of 0.8% °C –1 at 40 °C, requiring blue excitation . A comparison of the double-band thermometric performance of the Pr/Ho CSS-NPs to other Ln 3+ -doped systems operating within the NIR region (so far limited to combinations of Nd 3+ , Er 3+ , Ho 3+ , and Tm 3+ when seeking emission wavelengths longer than 1000 nm) reported in the literature can be found in the SI (Table S5). ,,,, …”

“…Tamboli et al proposed a double-band approach based on the nonthermally coupled 3 P 0 → 1 G 4 (994 nm) and 1 G 4 → 3 H 5 (1306 nm) transitions of Pr 3+ with maximum S r of 0.8% °C−1 at 40 °C, requiring blue excitation. 31 A comparison of the double-band thermometric performance of the Pr/Ho CSS-NPs to other Ln 3+ -doped systems operating within the NIR region (so far limited to combinations of Nd 3+ , Er 3+ , Ho 3+ , and Tm 3+ when seeking emission wavelengths longer than 1000 nm) reported in the literature can be found in the SI (Table S5). 14,15,32,35,52 ■ SINGLE-BAND RATIOMETRIC THERMOMETRIC PERFORMANCE Irrespective of the Pr/Ho CSS-NP architecture, temperature influenced the spectral fine-structure of the Pr 3+ emission band (Figure 3A−D).…”

“…Moreover, the exploration of Pr adds to the spectral variety of commonly studied Ln 3+ ions, potentially offering new avenues for optical multiplexing applications . Yet, while the thermal response of the upconversion emission as well as UV–vis triggered NIR emission of Pr 3+ has been demonstrated, ,,,,, Pr 3+ -based nanothermometers that fully operate in the NIR spectral region (excitation and emission) have not been reported to date. This motivated us to develop the first NIR-NIR Pr 3+ -based nanoscale thermal sensor.…”

Luminescence Thermometry Based on the Upconversion Luminescence from the Stark Sublevels of BaY2F8:Yb3+, Tm3+ Phosphor

“…In this technique, the FIRs of the emission peaks originating from the thermally-coupled energy levels (TCELs) are determined at different temperatures. The FIRs of the TCELs follow Boltzmann distribution law [ 12 , 13 ]. The energy spacing between the TCELs must lie between 200 and 2000 cm − 1 [ 14 , 15 ].…”

“…The energy spacing between the TCELs must lie between 200 and 2000 cm − 1 [ 14 , 15 ]. Stark sublevels of Ln 3+ ions also behave similar to TCELs; hence, the FIRs of Stark sublevels also contribute towards efficient temperature-sensing [ 4 , 13 ]. In this study, the Stark sublevels of Tm 3+ ions were used to study the temperature-sensing properties of BYF:Yb 3+ ,Tm 3+ phosphor.…”