Mn⁴⁺-Activated Double-Perovskite-Type Sr₂LuNbO₆ Multifunctional Phosphor for Optical Probing and Lighting

Abstract

Multifunctional phosphors have significant application and scientific value and are becoming a research hotspot in the field of luminescent materials. Herein, we report Mn 4+ -activated double-perovskite-type Sr 2 LuNbO 6 multifunctional phosphors with excellent comprehensive properties in the fields of optical temperature/pressure sensing and w-LED lighting. The crystalline structure, elemental composition, optimal doping concentration, crystal-field strength, and optical bandgap of the phosphors are investigated in detail, and the mechanisms of concentration and thermal quenching are discussed. From the optimal Sr 2 LuNb 0.998 O 6 :0.2%Mn 4+ phosphor, a LED lamp for indoor warm-white lighting is successfully fabricated. Further, the thermometric properties of the phosphors are explored for applications as FIR-and lifetime-based thermometers, showing a maximum relative sensitivity of 1.55% K −1 at 519 K. Upon pressure loading, a significant red-shift of the peak centroid is observed, and the pressure sensitivity is determined to be 0.82 nm/ GPa. These results suggest that the Mn 4+ -activated Sr 2 LuNbO 6 multifunctional phosphors have great potential to be utilized in the fields of optical thermometry, manometry, and lighting.

Multifunctional Optical Sensing with Lanthanide-Doped Upconverting Nanomaterials: Improving Detection Performance of Temperature and Pressure in the Visible and NIR Ranges

“…The performance of the thermometers can be quantified using absolute and relative thermal sensitivity. Absolute thermal sensitivity demonstrates the absolute change in the LIR with temperature change and is defined as follows: , S a = ∂ LIR ∂ T …”

A highly efficient deep red-emitting Mn4+-powered oxyfluoride nanophosphor developed for plant growth and optical thermometric applications

“…Plants perceive light through several organic pigments, which originate from photosynthetic prokaryotes. 7,8 Research indicates that blue light (400–500 nm) and red light (620–690 nm) match perfectly with the main absorption region of chlorophyll A and chlorophyll B, respectively. However, deep red light (>650 nm) and far-red light (700–740 nm) critically match with the absorption zone of red phytochrome (P R ) and far-red phytochrome (P FR ), respectively.…”

“…However, deep red light (>650 nm) and far-red light (700–740 nm) critically match with the absorption zone of red phytochrome (P R ) and far-red phytochrome (P FR ), respectively. 7,8 pc-LEDs with lighting features that match the absorption of the above-mentioned natural pigments are highly beneficial for indoor plant growth due to additional benefits including low energy consumption, cost-effectiveness, and a long life cycle. So far, pc-LEDs for plant growth applications have been made with red and deep red phosphor powders coated on suitable blue LED chips.…”

“…So far, pc-LEDs for plant growth applications have been made with red and deep red phosphor powders coated on suitable blue LED chips. 7,8 Commercial nitride red phosphors, such as CaAlSiN 3 :Eu 2+ and Sr 2 Si 5 N 8 :Eu 2+ , could be suitable due to their broad absorption and emission spectral features in blue and red regions, respectively. However, the deficiency of deep and far-red emissions in the region of 640–740 nm limits their application in this area.…”

Pressure‐Induced Remarkable Spectral Red‐Shift in Mn2+‐Activated NaY9(SiO4)6O2 Red‐Emitting Phosphors for High‐Sensitive Optical Manometry

“…[ 6 , 7 ] In general, the pressure‐sensitive luminescent materials doped with rare‐earth or transition metal ions are often utilized to detect pressure changes in the DAC assembly through analyzing their pressure‐dependent spectral features (manometric parameters), such as full width at half maximum (FWHM), emission band position, luminescence intensity ratio, and emission decay time. [ 8 , 9 , 10 , 11 ] Currently, the Al 2 O 3 :Cr 3+ (ruby) and SrB 4 O 7 :Sm 2+ compounds are the most commonly used luminescent materials to calibrate high pressure, in which their pressure sensitivities are 0.365 and 0.255 nm GPa −1 , respectively. [ 12 , 13 ] However, their small sensitivities cannot satisfy the growing needs of technological and scientific progress.…”