A universal strategy to enhance the absolute sensitivity for temperature detection in bright Er³⁺/Yb³⁺ doped double perovskite Gd₂ZnTiO₆ phosphors

Abstract

We report a universal strategy consisting of I1/I2 and I2/I1 parts to enhance the SA for temperature sensing applications.

Luminescent Yb3+,Er3+-Doped α-La(IO3)3 Nanocrystals for Neuronal Network Bio-Imaging and Nanothermometry

“…From the ratiometric approach on the micro-PL setup, we measured a relative thermal sensitive S r of Yb 3+ ,Er 3+ -doped α-La(IO 3 ) 3 nanocrystals of 1.2% K −1 in neuronal cells, higher than previously reported values for other inorganic materials, including Green Fluorescent Proteins (GFP) [ 55 ], Nd 3+ -doped nanocrystals (0.1% K) [ 18 ], or quantum dots [ 56 ] ( Table 1 ). This value is comparable to that of other Er 3+ -doped materials [ 57 , 58 ] or hybrid materials [ 59 ], as a consequence of the energy gap between the two emitting levels of Er 3+ ( 4 S 3/2 and 2 H 11/2 ) whose splitting does not differ much with the host matrix. More complex systems, such as the association of rare-earth doped nanocrystals with chromophores presenting a triplet-triplet annihilation mechanism, can provide higher sensitivity (7% K −1 ) and high thermal resolution (0.1 K) [ 60 ].…”

Charge transfer band excitation of La3NbO7:Sm3+ phosphors induced abnormal thermal quenching toward high‐sensitivity thermometers

“…The experimental data could be well matched to Equation (), as shown in Figure 6A. Subsequently, the absolute ( S a ) and relative ( S r ) sensing sensitivities could be further investigated by the following expressions 32‐34 :…”

Manipulation of upconversion property and enhancement of sensitivity by tailoring the local structure

“…The results prove that higher S A can be achieved in the two‐phase coexistence system contrasting to the single host due to the different thermal response behaviors of the two hosts. Compared with other Er 3+ ‐based optical thermometers presented in Table 4, the S A is comparable to those in Ba 3 Y 4 O 9 , 15 NaYF 4 , 61 Ba 2 In 2 O 5 , 62 NaGaF 4 , 63 and NaYTiO 4 64 hosts, but lower than those in Gd 2 ZnTiO 6 , 18 Bi 5 IO 7 , 54 and Na 0.5 Gd 0.5 MoO 4 60 hosts. On the other hand, the maximum S A is obtained at lower temperature with the increasing of La 3+ concentration (520 K for x = 0.2 and 0.4, 450 K for x = 0.6, and 420 K for x = 0.8).…”

“…However, the S A value is restricted by the constant energy gap of the TCLs, it means that high S A is unable to be achieved in most Yb 3+ and Er 3+ co‐doped materials. To tackle this problem, many strategies have been proposed, such as choosing a suitable host, 12 forming a core‐shell structure, 13,14 utilizing the sub‐Stokes level, 15,16 adding transition metal ions, 17 and dealing with several sections 18‐20 . In our previous work, we proposed a feasible route based on the different thermal response behaviors of various hosts to improve the S A value in two‐phase coexistence system 21 …”

“…To tackle this problem, many strategies have been proposed, such as choosing a suitable host, 12 forming a core-shell structure, 13,14 utilizing the sub-Stokes level, 15,16 adding transition metal ions, 17 and dealing with several sections. [18][19][20] In our previous work, we proposed a feasible route based on the different thermal response behaviors of various hosts to improve the S A value in two-phase coexistence system. 21 Another factor that restricts the application of UC luminescence materials in the field of temperature sensing is their relatively low luminescence efficiency.…”