Impact of Negative Thermal Expansion on Thermal Quenching of Luminescence of Sc₂Mo₃O₁₂:Eu³⁺

Abstract

Thermal quenching (TQ) is a major challenge facing many phosphors, especially those used in the high-temperature range. To overcome this obstacle, here we present a new phenomenon of excitation-wavelength-dependent antithermal quenching (anti-TQ) luminescence over a broad temperature range. We have observed that the luminescence intensity of Eu 3+ -doped Sc 2 Mo 3 O 12 almost triples at elevated temperatures along with intensified energy transfer from the host to the dopant upon excitation at the charge-transfer band of 277 nm. Specifically, the absolute emission intensity of Sc 2 Mo 3 O 12 :20%Eu 3+ measured at 398 and 798 K reaches 292% and 97% of its initial intensity taken at 298 K, respectively. Similar to the photoluminescence emission intensity, the lifetime also elongates upon heating with a maximum value at 623 K. We have unveiled the mechanism of the excitation-wavelength-dependent anti-TQ luminescence, which is attributed to the promoted energy transfer induced by the negative thermal expansion (NTE) property of the Sc 2 Mo 3 O 12 host. Moreover, we have demonstrated the efficient high-temperature luminescence thermometric performance of this anti-TQ luminescence phosphor using its temperature-dependent lifetime. The new phenomenon and experimental findings presented in this study provide inspiration for the future exploration of NTE-based phosphors with thermally enhanced luminescence performance via their intensified energy transfer for broad potential applications.

Highly efficient blue‐emitting phosphor via charge compensation strategy and its application for white LED lighting

“…practical equipment applications. 58,59 Temperaturedependent emission spectra of SGSBO:0.08Ce 3+ and SGSBO:0.08Ce 3+ ,0.08Na + in the temperature range from 298 to 473 K were depicted in Figure 8A,C. The emission intensity falls into a decline with the gradual rise of temperature owing to the thermal quenching effect.…”

“…The temperature quenching properties have been investigated to estimate the potential application in practical equipment applications 58,59 . Temperature‐dependent emission spectra of SGSBO:0.08Ce 3+ and SGSBO:0.08Ce 3+ ,0.08Na + in the temperature range from 298 to 473 K were depicted in Figure 8A,C.…”

Interplay of Consecutive Energy Transfer and Negative Thermal Expansion Property for Achieving Superior Anti‐Thermal Quenching Luminescence

“…In this study, we first synthesized a series of Sc The basic crystallographic structure of SMOE20T2 (Figure 1a) and Sc 2(1-y%) Mo 3 O 12 :ymol%Tb 3+ with different Tb 3+ doping concentrations (Figure S1a, Supporting Information) was initially determined by X-ray diffraction (XRD) patterns. As the optimized concentration of Eu 3+ ion in SMO host is 20% based on our previous study, [10] here we prepared several Tb 3+ singly doped Sc 2(1-y%) Mo 3 O 12 :ymol%Tb 3+ samples to determine the optimized Tb 3+ concentration in SMO host before combining it with 20%Eu 3+ for our co-doped samples. The optimal Tb 3+ concentration is 2mol% Tb 3+ from the singly-doped samples according to Figure S5a (Supporting Information).…”

Simultaneously tuning the luminescent color and realizing an optical temperature sensor by negative thermal expansion in Sc2(WO4)3:Tb/Eu phosphors

“…[18][19][20][21][22][23][24] This performance implied the potential to control the thermal quenching behavior of downshifting (DS) luminescent materials by selecting NTE materials and suitable doped-lanthanide ions. For the reported DS luminescent materials with NTE characteristics, the absolute majority of them are single lanthanide ion-doped, such as Sc 2 (MoO 4 ) 3 :Eu 3+ and Lu 2 (MoO 4 ) 3 :Eu 3+ , 25,26 and they also exhibit anti-thermal quenching behavior. However, the limitation of using a single lanthanide ion is that it restricts emission tunability and makes it challenging to exploit different thermal quenching behaviors for highly sensitive temperature sensing.…”