Optical Thermometry Based on Vibration Sidebands in Y₂MgTiO₆:Mn⁴⁺Double Perovskite

Abstract

Mn-doped YMgTiO phosphors are synthesized by the traditional solid-state method. Powder X-ray diffraction, scanning electron microscope, and energy-dispersive X-ray spectrometer are employed to characterize the samples. The Mn-doped YMgTiO phosphors show the far-red emission at ∼715 nm, which is assigned to the E → A spin-forbidden transition of Mn. The temperature-dependent luminescent dynamics of Mn is described by a complete model associated with electron-lattice interaction and spin-orbit coupling. The noncontact optical thermometry of YMgTiO:Mn is discussed based on the fluorescence intensity ratio of thermally coupled anti-Stokes and Stokes sidebands of the efficient ∼715 nm far-red emission in the temperature range of 10-513 K. The maximum sensor sensitivity of YMgTiO:Mn is determined to be as high as 0.001 42 K at 153 K, which demonstrates potential applications for the optical thermometry at low-temperature environments.

None‐rare‐earth activated Ca14Al10Zn6O35:Bi3+,Mn4+ phosphor involving dual luminescent centers for temperature sensing

“…From Figure A, of the PL intensities at different temperature, it is noteworthy that unlike the thermal performance of Bi 3+ ion whose fluorescence intensity shrinks gradually with the rise of temperature as most transition metal ions tend to act, the intensity of Mn 4+ ion slightly increases at first and then decreases beyond 403 K due to the existence of anti‐Stokes sidebands resulted from its unique 3 d n electronic configurations and great host crystal field strength, as depicted in Figure B. During temperature period between 303 and 403 K, the anti‐Stokes sidebands of Mn 4+ ion can become thermally depopulated to achieve thermal equilibrium, which, as a result, overtakes the intrinsic thermal quenching effect, and results in its intensity elevating with temperature.…”

Synthesis and up‐conversion of Er3+ and Yb3+ Co‐doped LiY(MoO4)2@SiO2 for optical thermometry applications

“…A large change in FIR may cut down the accuracy of optical thermometer . To further take full use of the materials under investigation, we measured the changes in FIR by varying the pumping power (Figure ).…”

“…As the groundwork of many temperature‐sensitive optical devices, the FIR technique takes advantage of two adjacent thermally coupled energy levels (TCELs) of rare earth ions . Thanks to the wide choice of temperature range, flexible device structures and controllable energy levels, the FIR based non‐contact temperature sensor is regarded as a promising option for optical thermometry . On the other hand, in order to avoid the strong overlap between the two emission levels, the energy gap between them should be in the range of 200‐2000 cm −1 so that the ratio of the TCELs can eliminate the influence of the spectral losses .…”

Rare‐earth‐free Li5La3Ta2O12:Mn4+ deep‐red‐emitting phosphor: Synthesis and photoluminescence properties

“…As one of non‐rare‐earth activators for red‐emitting phosphors, Mn 4+ ion with 3 d 3 electron configuration is attracting considerable interest because it can show broad absorption band in the range from 220 to 570 nm and exhibit red or deep red emission in the region from 600 to 790 nm due to the 2 E→ 4 A 2 transition . Mn 4+ ion can usually be stable in octahedral environments and substitute for the Al 3+ , Sc 3+ , Ga 3+ , Ti 4+ , Si 4+ , Ge 4+ , Zr 4+ , Sn 4+ , Ta 5+ , Nb 5+ , Sb 5+ , Te 6+ , Mo 6+ , and W 6+ sites in octahedral cell and form the octahedral center in host lattice . The luminescence properties of Mn 4+ ‐doped phosphors can be affected by the co‐valency of the “Mn 4+ ‐ Ligand” bonding and the host crystal field environment.…”

“…12,13 Mn 4+ ion can usually be stable | 5911 CAO et Al. in octahedral environments and substitute for the Al 3+ , Sc 3+ , Ga 3+ , Ti 4+ , Si 4+ , Ge 4+ , Zr 4+ , Sn 4+ , Ta 5+ , Nb 5+ , Sb 5+ , Te 6+ , Mo 6+ , and W 6+ sites in octahedral cell and form the octahedral center in host lattice. [14][15][16][17][18][19][20][21][22][23][24][25][26][27] The luminescence properties of Mn 4+ -doped phosphors can be affected by the co-valency of the "Mn 4+ -Ligand" bonding and the host crystal field environment. Up to now, there are two main kinds of hosts for Mn 4+ doping, such as fluorides and oxides.…”