A novel optical thermometry based on the energy transfer from charge transfer band to Eu3+-Dy3+ ions

Abstract

Optical thermometry based on the up-conversion intensity ratio of thermally coupled levels of rare earth ions has been widely studied to achieve an inaccessible temperature measurement in submicron scale. In this work, a novel optical temperature sensing strategy based on the energy transfer from charge transfer bands of W-O and Eu-O to Eu3+-Dy3+ ions is proposed. A series of Eu3+/Dy3+ co-doped SrWO4 is synthesized by the conventional high-temperature solid-state method. It is found that the emission spectra, emission intensity ratio of Dy3+ (572 nm) and Eu3+ (615 nm), fluorescence color, lifetime decay curves of Dy3+ (572 nm) and Eu3+ (615 nm), and relative and absolute sensitivities of Eu3+/Dy3+ co-doped SrWO4 are temperature dependent under the 266 nm excitation in the temperature range from 11 K to 529 K. The emission intensity ratio of Dy3+ (572 nm) and Eu3+ (615 nm) ions exhibits exponentially relation to the temperature due to the different energy transfer from the charge transfer bands of W-O and Eu-O to Dy3+ and Eu3+ ions. In this host, the maximum relative sensitivity Sr can be reached at 1.71% K−1, being higher than those previously reported material. It opens a new route to obtain optical thermometry with high sensitivity through using down-conversion fluorescence under ultraviolet excitation.

Up-Converting K2Gd(PO4)(WO4):20%Yb3+,Ho3+ Phosphors for Temperature Sensing

“…The broad excitation band in the range of 250-330 nm is attributed to the O 2-to W 6+ charge-transfer transition within the WO4 2− . Such transitions are typical for the tungstate compounds in this spectral range and reported by many authors [41,42]. The excitation (λ em = 544 nm) spectra of K 2 Gd(PO 4 )(WO 4 ):Ho 3+ and K 2 Gd(PO 4 )(WO 4 ): 20%Yb 3+ ,Ho 3+ (where the Ho 3+ concentration is 1% and 10%) samples were measured in the 250-500 nm range and are depicted in Figure 3a,c, respectively.…”

Four New 3D Metal–Organic Frameworks Constructed by a V-shaped Tetracarboxylates Ligand: Selective CO2 Sorption and Luminescent Sensing

“…Cu 2+ and Fe 3+ ions show negligible photon-absorption at 300 nm, so there is no clear evidence for competitive adsorption between Cu 2+ /Fe 3+ ion and Eu@3 . However, the concentration of Cu 2+ /Fe 3+ ion and the luminescent intensity all indicated the dynamic mechanism in the quenching process. , Therefore, the quenching mechanism is probably attributed to the collision interactions between the framework and metal ions, which decreases the efficiency of intersystem crossing 1 pp*– 3 pp* and reduces the efficiency of ligand-to-Eu energy transfer, further leading to the quenching effect on the luminescence of Eu 3+ ion. − …”

Multimodal Non-Contact Luminescence Thermometry with Cr-Doped Oxides

“…Therefore, luminescence thermometry has become an important part of metrology and is evolving rapidly. Evidence for that is the fact that more than 100 luminescence materials for this application have already been identified and reported (see reviews [ 6 , 7 , 8 ] and references therein) while new prospective compounds are emerging on a regular basis [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ].…”