A novel Eu²⁺/Tb³⁺ co‐doped phosphor with pyroxene structure applied for cryogenic thermometric sensing

Abstract

Pyroxene-type phosphors were widely developed due to the advantages of high chemical stability, luminous efficiency, and low production cost. In this contribution, a series of Eu 2+ /Tb 3+ co-doped Ca 0.75 Sr 0.2 Mg 1.05 Si 2 O 6 (CSMS) phosphors with pyroxene structure were successfully synthesized by the solid-state method. Under the 340 nm excitation, the emission peaks of the phosphor show a redshift with the increase of Eu 2+ concentration. The emitting color of Eu 2+ /Tb 3+ co-doped samples shows a redshift attributed to the energy transfer from Eu 2+ to Tb 3+ . Simultaneously, acquired thermometer exposes superbly temperaturesensitive properties (S a and S r having maximum values 4.7% K −1 and 0.6% K −1 , respectively) over the cryogenic temperature range (77-280 K). Furthermore, it has good stability and precision at cryogenic temperatures, indicating that CSMS:0.03Eu 2+ /0.03Tb 3+ phosphor is a very promising fluorescent material suitable for cryogenic temperature sensing.

A multicolor‐emitted phosphor for temperature sensing and multimode dynamic anti‐counterfeiting

“…Due to the unique dual emission, Ba 0.99 Ga 2 O 4 :0.01Bi creates favorable conditions for temperature sensing. Figure 5A shows the PL emission intensities of the Bi1 (500 nm) and Bi2 (610 nm) groups with the temperature increase from 323 to 473 K. To evaluate the temperature‐sensing performance of Ba 0.99 Ga 2 O 4 :0.01Bi phosphor, the FIR value can be calculated by the following equation 38 : $$\begin{equation}FIR\; = \frac{{{I_{500{\rm{\;nm}}}}}}{{{I_{610{\rm{\;nm}}}}}}\; = \;A{\rm{exp}}\left[ {\frac{{ - {{\Delta}}E}}{{kT}}} \right] + B\end{equation}$$where I 500 and I 610 represent the PL intensity at 500 and 610 nm, T represents the temperature, k is Boltzmann's constant, Δ E represents the energy required to transition among different energy levels, A and B are the constant. The calculated FIR values can be fitted by the red curve in Figure S14.…”

“…We further calculated the absolute temperature sensitivity ( S a ) as well as the relative temperature sensitivity ( S r ) to accurately evaluate the temperature sensitivity of the material by using the following equations 38 : $$\begin{equation}{\rm{\;}}{S_a} = \;FIR\frac{{ - {{\Delta}}E}}{{k{T^2}}}\end{equation}$$ $$\begin{equation}{\rm{\;}}{S_r} = \frac{{ - {{\Delta}}E}}{{k{T^2}}}\;\end{equation}$$…”

“…Due to the unique dual emission, Ba 0.99 Ga 2 O 4 :0.01Bi creates favorable conditions for temperature sensing. Figure 5A shows the PL emission intensities of the Bi1 (500 nm) and Bi2 (610 nm) groups with the temperature increase from 323 to 473 K. To evaluate the temperature-sensing performance of Ba 0.99 Ga 2 O 4 :0.01Bi phosphor, the FIR value can be calculated by the following equation 38 :…”

“…We further calculated the absolute temperature sensitivity (S a ) as well as the relative temperature sensitivity (S r ) to accurately evaluate the temperature sensitivity of the material by using the following equations 38 :…”

Synthesis and photoluminescence properties of a novel green‐emitting LiYGeO4:Tb3+ long afterglow phosphor

“…[ 14 ] Su K described CaScAlSiO 6 :Tb 3+ /Sm 3+ ceramics with excellent cryogenic optical thermometry performance [ 15 ] and the Eu 2+ /Tb 3+ co‐doped phosphor has potential applications in cryogenic thermometric sensing. [ 16 ] Furthermore, Liu H developed a new strategy for realizing ratiometric optical thermometry via efficient Tb 3+ –Mn 2+ energy transfer in the phosphor Ca 9 Tb(PO 4 ) 5 (SiO 4 )F 2 . [ 17 ] Back in 2018, Kai Cheng et al .…”