Dual-mode optical thermometry based on Bi3+/Sm3+ co-activated BaGd2O4 phosphor with tunable sensitivity

Na2GdMg2V3O12:Sm3+ phosphors for three‐mode optical temperature sensing

“…After doping Sm 3+ ions, there are some sharp peaks at 550–750 nm. They locate at 566, 613, 651, and 711 nm, which root in 4 G 5/2 → 6 H j ( j = 5/2, 7/2, 9/2, and 11/2) transitions of Sm 3+ ions, respectively 29 . Figure 3(B) displays the variation of I (Sm 3+ ) and I (VO 4 3− ) with Sm 3+ concentration.…”

“…They locate at 566, 613, 651, and 711 nm, which root in 4 G 5/2 → 6 H j (j = 5/2, 7/2, 9/2, and 11/2) transitions of Sm 3+ ions, respectively. 29 Sm 3+ ions (Detailed processes are provided in Figure S1 in Electronic Supporting Information [ESI] file). As Sm 3+ ions concentration going up, I(VO 4 3− ) decreases monotonously.…”

Temperature sensing of Sr3Y2Ge3O12:Bi3+,Sm3+ garnet phosphors with tunable sensitivity

“…Furthermore, the associated equations related to FIR for evaluating the absolute sensitivity ( S a ) and relative sensitivity ( S r ) of temperature sensing could be represented as follows: 40,41 …”

“…5c reveals the trend of FIR on 1/T for Sr 3 Y 2 Ge 3 O 12 :0.06Bi 3+ ,0.02Sm 3+ and the exponential fitting with a R 2 value of 0.99491, indicating a remarkably favorable concordance between the experimental data and the proposed results. Furthermore, the associated equations related to FIR for evaluating the absolute sensitivity (S a ) and relative sensitivity (S r ) of temperature sensing could be represented as follows: 40,41 S a ¼ @FIR @T ¼C expðÀΔE=k B TÞ Â…”

The synergism between self-activated and impurity-related emissions of LiCa3ZnV3O12: lattice distortion, energy transfer and temperature sensing effect

“…As the temperature increases, the excited electrons of [VO 4 ] 3− groups absorb additional vibrational energy and cross the barrier DE 1 to the intersection of 3 T 1,2 and 1 A 1 states, and rapidly relax to ground state 1 A 1 by non-radiative transition. Meanwhile, part of electrons at the 5 D 0 level of Eu 3+ absorbed energy, surmounted the activation energy barrier DE 2 by phonon-electron coupling 38,39 to the intersection of 5 D 0 and 7 F 6 , and nally back to the ground state through non-radiative transition. 32,37,40 In summary, as the temperature increases, the thermal vibration of the matrix lattice is enhanced, and the phonons in the crystal increase, leading to the enhanced probability of the multiphonon relaxation process.…”