ADVANCED FUNCTIONAL MATERIALS
·
2025
·Vol. 35
·期 48
·2507563
·
IF 19
Ke Su,Lefu Mei,Zunqi Liu,Xin Pan,Pengfei Shuai,Jiyang Xie,Bin Ma,Qingfeng Guo,Cunjian Lin,Mingxing Chen,Zhijian Peng,Libing Liao,Wanbiao Hu,Guocheng Lv
Balancing sensitivity and detection range in dynamic pressure monitoring materials remains challenging, with commercial ruby (Al 2 O 3 :Cr 3+ ) sensors limited by strong crystal fields, restricting performance under extreme conditions. Here, an innovative strategy utilizing an ordered-to-disordered structural conversion in Cr 3+ doped Ca(Mg,Sc)(Al,Si)O 6 phosphors is introduced. This approach achieves a remarkable blueshift sensitivity of 15.08 nm GPa −1 –2.8 times higher than ordered structures and 41 times higher than commercial sensors while maintaining a broad detection range up to 7.5 GPa. Moreover, enhanced structural rigidity notably improves luminescence intensity and thermal stability. The findings establish a robust paradigm for designing high-performance optical pressure sensors, significantly addressing the traditional trade-off between sensitivity and detection range, showing promising applications in geological exploration and aerospace fields.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 26
·9030-9036
·
IF 6.4
Jinyi Wang,Xudong Wang,Chenjie Zhang,Xinyu Zhang,Tianliang Zhou,Rong-Jun Xie
Near-infrared (NIR) phosphors play a key role in phosphor-converted NIR emitters, but to find broadband phosphors still remains a great challenge due to the lack of strategies for screening appropriate hosts. Herein, we report a broadband Sr6Sc2Al4O15:Cr3+ NIR phosphor by choosing a host that has crystallographic sites accommodated for both Ce3+ and Cr3+ simultaneously. The emission spectrum of Sr6Sc2Al4O15:Cr3+ covers the region of 600–1500 nm, having a maximum at 860 nm and a full width at half-maximum (FWHM) of 241 nm. A NIR pc-LED was fabricated by combining the Sr6Sc2Al4O15:Cr3+ phosphor with a blue LED, which can produce a NIR output power of 0.16 mW driven at 750 mA. The fabricated NIR emitter demonstrates a good suitability in night vision and non-destructive detection.
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JOURNAL OF MODERN OPTICS
·
2024
·
IF 1.2
Hui Ying Zhang,Wan Ying Xie,Peng Zhang,Xiao Hui Li,Zian Cheak Tiu
In this work, NaGdF4: 20%Yb, 2%Er microcrystals with varying contents of Cr3+ doping were obtained by conventional hydrothermal process. The microcrystal phase structure, morphology, upconversion luminescence mechanism, as well as temperature sensing behaviour under different treatment methods were researched. Based on the thermally coupled 2H11/2 and 4S3/2 levels of Er3+ and the dependence of fluorescence intensity ratio (FIR) on temperature, the optical temperature sensing behaviour of micrometer crystals were experimentally demonstrated. The NaGdF4: 20%Yb, 2%Er, 7%Cr microcrystals treated with high-temperature annealing show the best temperature sensing behaviour within the temperature span of 298–498 K. NaGdF4: 20%Yb, 2%Er, 7%Cr microcrystals with high temperature annealing presented the feasibility and promising properties for optical temperature sensing. The endeavour of emerging materials could lay the groundwork for future sustainable photonics engineering industrial growth.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Yu Wang,Lkhamsuren Bayarjargal,Maxim Bykov,Elena Bykova,Dominik Spahr,Konstantin Glazyrin,Victor Milman,Bjoern Winkler
We synthesized three carbonates, Cr2[CO3]3, Cr2[C2O5][CO3]2, and Cr2[CO3][O]2, containing Cr3+ by laser heating of chromium oxides in CO2 at pressures between 45 and 55 GPa. All phases were characterized by single-crystal X-ray diffraction and Raman spectroscopy, while density functional theory calculations complemented the experimental results. The structure of Cr2[CO3]3-P63/m contains coplanar groups, and a 4f Wyckoff site is half occupied by Cr3+. Cr2[C2O5][CO3]2-C2/c is characterized by coplanar [CO3]2− and pyro-[C2O5]2− anions and is isostructural to Al2[C2O5][CO3]2. It was obtained only after prolonged laser heating. The oxycarbonate Cr2[CO3][O]2-Pbcn was synthesized at the highest pressure (55 GPa) studied here. In this structure, half of the oxygen atoms coordinate one carbon and two Cr atoms, while the other half coordinate three chromium atoms. The oxidation state of chromium in the carbonates is +3, independent of the oxidation state (+3 or +4) of chromium in the oxide starting material. We observed the transformation of Cr2O3-R3̅c to Cr2O3-Pbcn above 45(2) GPa after laser heating.
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PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Renping Cao,Jiaxue Tang,Jingheng Nie,Chenxing Liao,Ya Cao,Lan Li,Ru Liu,Jing Wang
Due to their applications in lighting, imaging, security, night vision, optoelectronics and other fields, far-red to near-infrared luminescence materials have attracted significant interest. Efficient pure phase Ca 2 AlNbO 6 :Cr 3+ phosphor is synthesized in air. The excitation spectrum of Ca 2 AlNbO 6 :Cr 3+ can be observed in the range of 260–700 nm because of the transitions 4 A 2 → 4 T 1 ( 4 P), 4 T 1 ( 4 F), and 4 T 2 ( 4 F) of the Cr 3+ ions. Ca 2 AlNbO 6 :Cr 3+ emits far-red to near-infrared light with peaks at 745 and 755 nm in the range of 650–880 nm due to the transitions 2 E → 4 A 2 and 4 T 2 ( 4 F) → 4 A 2 of the Cr 3+ ion. The concentration dependent spectra of Ca 2 AlNbO 6 :Cr 3+ confirm that 0.4 mol% is the optimal concentration of Cr 3+ ions in Ca 2 AlNbO 6 :Cr 3+ . The emission spectra under different excitation wavelength and time-resolved emission spectra indicate that Cr 3+ is the only luminous center in Ca 2 AlNbO 6 :Cr 3+ . As Cr 3+ is added from 0.2 mol% to 1.0 mol%, the lifetime of Ca 2 AlNbO 6 :Cr 3+ decreases in turn from 3.25 ms to 2.82 ms. The temperature dependent spectra prove a good thermal stability of Ca 2 AlNbO 6 :Cr 3+ . The paper content can be applied to develop new Cr 3+ -doped luminescence materials in the future.
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Advanced Optical Materials
·
2025
·
IF 7.2
Ou Xu,Xiaoyan Lu,Xiaodong Shen,Tongzhou Li,Bao Ke,Jialong Zhao,Bingsuo Zou
CsPbBr 3 nanocrystals (NCs) have attracted extensive attention due to their high color purity and good thermal stability. However, due to the quenching of surface defects, the photoluminescence quantum yields (PLQY) are low, and there are few previous comparative studies on the magnetic ion doping of powders and nanocrystals in this system. In this article, the effect of Cr 3+ doping CsPbBr 3 NCs and CsPbBr 3 powders and their PL properties is investigated. The successful doping of Cr 3+ is verified by TEM, SEM, and EDS characterization. At the appropriate amount of Cr 3+ , the PLQY of Cr 3+ doped CsPbBr 3 NCs achieves 96%, twice that of undoped CsPbBr 3 NCs. However, the PLQY of the CsPbBr 3 powder does not change much after Cr 3+ doping at its close emission wavelength. The electron paramagnetic resonance (EPR), temperature dependent PL and density functional theory (DFT) calculation show that the enhanced PL of doped CsPbBr 3 NCs is due to the formation of exciton magnetic polaron (EMPs), while the confined excitons in undoped NCs are multiple due to spin-orbit interaction. In CsPbBr 3 powders, both EMPs and antiferromagnetic excitons (AMPs) coexist and compete, verified by the PL decay curve, temperature variation spectra, and low temperature PL spectra in strong magnetic field.
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JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Fangrui Cheng,Yixuan Lai,Yizhi Zheng,Luxia Zhong,Fangmin Lin,Huanyi Gu,Qi Wu,Xin Lan,RunYing Zheng,JiaYi Cheng,Ruirui Yang,Renping Cao,Xiping Jing
During recent years, non-contact ratiometric luminescent thermometry has gained increasing attention in scientific research due to its remarkable advantages including high precision, rapid response, and operational convenience. Chromium ions (Cr 3+ ), owing to their high emission intensity and inherent benefits from the 3d 3 electronic configuration, have emerged as the most extensively utilized transition metal ions in luminescent temperature sensing. Accordingly, we synthesized Lu 2 BaAl 4 SiO 12 :Cr 3+ phosphors via high-temperature solid-state reaction and systematically investigated their photoluminescence-based temperature sensitivity. In this material, Cr 3+ ions experience strong crystal field effects, resulting in the observation of both R-line emissions and narrowband emissions from the overlapping 2 E and 4 T 2 transitions. By strategically employing the fluorescence intensity ratio (FIR) between these emissions, we developed a ratiometric luminescent thermometer achieving a maximum relative sensitivity ( S r ) of 1.93%/K at 498 K. Furthermore, an optical temperature-sensing film was fabricated for practical temperature measurements in organic solutions. The results demonstrate excellent agreement between FIR-derived temperatures and programmed values, with a maximum deviation of merely 1.49 K. These findings establish a novel approach for designing highly sensitive Cr 3+ -doped ratiometric fluorescent temperature sensors.
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OPTICAL MATERIALS
·
2026
·
IF 4.3
Jun Yang,Qiju Li,Daoming Guo,Ziliang Zhu,Shijia Sun,Chonghui Li,Xiaohui Lin,Degao Zhong
Near-infrared persistent luminescent (NIR-PersL) materials exhibit potential applications in dark field tracing, non-invasive bio-imaging, etc. Herein, we report a series of BaMgAl 10- x Ga x O 17 :Cr 3+ (BA 10- x G x M:Cr) NIR-PersL materials with tunable PersL properties. The substitution of Al 3+ by Ga 3+ shifts thermoluminescence peaks (from 490 K to 360 K) and modulates trap distributions to optimize trap depth for PersL emission. The optimal BA 6 G 4 M:Cr sample achieves a threefold improvement in PersL intensity relative to the Ga-free pristine material, with detectable PersL duration for 72 h. Dark-field tracing and biological tissue penetration tests were performed using BA 6 G 4 M:Cr, and clear 5 m long-distance dark-field tracing and 6 mm deep penetration in pork tissue were realized.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 18
·1407
·
IF 3.2
Jiang Zheng,Yang Xiaoliang,Xiao Siguo
Cr 3+ /Bi 3+ co-doped and Cr 3+ /Yb 3+ co-doped La 2 LiSbO 6 phosphors have been synthesized via a high-temperature solid-state method, respectively. La 2 LiSbO 6 : Cr 3+ gives a broadband emission peaking at 855 nm under 671 nm excitation. Partial substitution of La 3 ⁺ ions by Bi 3+ ions induces lattice distortion in the La 2 LiSbO 6 host and weakens the crystal field strength of Cr 3+ , leading to the red shift of Cr 3+ emission. The Cr 3+ emission peak shifts from 855 to 900 nm with Bi 3+ concentration increasing from 0 to 0.07 mol %. The increased lattice distortion also improves the local environment of Cr 3+ , thereby resulting in a threefold increase in luminescence intensity and a 25.8% increase in quantum yield. When the Yb 3+ ions are introduced, the emission peak can be further tuned from 855 to 1000 nm directly, induced by energy transfer from Cr 3+ to Yb 3+ ions. It is proven that quadrupole–quadrupole interaction is responsible for the energy transfer from Cr 3+ to Yb 3+ in the La 2 LiSbO 6 host. Moreover, the introduced Yb 3+ also largely improves the thermal stability of the phosphor. The work might provide meaningful reference for the design and development of highly efficient Cr 3+ -doped luminescent materials.
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PHYSICA B-CONDENSED MATTER
·
2021
·
IF 2.436
Yu Wang,Hao Suo,Leipeng Li,Guoqing Wang,Wenlu Deng,Wenge Ding,Zhijun Wang,Panlai Li,Zhiguo Zhang
The accurate measurement of temperature is of great importance in many fields ranging from industrial manufacture to our daily life, which can be finely implemented via the fluorescent intensity ratio (FIR) thermometry on the basis of Boltzmann distribution . Especially, the near-infrared (NIR)-emitting levels 4 T 2 / 2 E of Cr 3+ ion have recently emerged as the promising thermally coupled levels (TCLs), taking advantage of their superior optical property with high tunability. Herein, the crystal field strength around Cr 3+ ions in double-perovskite La 2 MgHfO 6 have been elaborately modulated via varying the dopant concentration, which greatly affect the intensity ratio between the spin-forbidden 2 E → 4 A 2 and spin-allowed 4 T 2 → 4 A 2 transitions. Thermal sensing behaviors based on the TCLs ( 4 T 2 / 2 E) were evaluated and the relative sensitivity gradually grew with the increase of crystal field strength . Above results offer guiding insights into the sensitivity optimization of Cr 3+ -based FIR thermometers, while providing the possibility of highly accurate measurement of temperature.
研究领域:
材料科学
·
光学传感
·
发光材料
·
测温技术
·
无机化学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Ning Mao,Shengqiang Liu,Zhen Song,Yi Yu,Quanlin Liu
Near-infrared phosphor (NIR) integrated light-emitting diode (LED) has ideal application prospects in the fields of food inspection and medical imaging. Herein, we have synthesized a garnet-type Ca 3 Y 2 Ge 3 O 12 :Cr 3+ NIR phosphor using solid state reaction method. Broadband NIR emission ranging from 700 to 1100 nm with a peak located at 800 nm indicates a weak crystal field strength for Cr 3+ , which occupies the six-coordinated Y 3+ site. Moreover, the phosphor has satisfactory luminous intensity showing 81%/10% internal/external quantum efficiency and excellent luminescence thermal stability. Our work provides an excellent NIR phosphor choice for NIR LED devices.
研究领域:
材料科学
·
光学工程
·
生物医学工程
·
分子影像
·
光电子学
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 6
·3446-3454
·
IF 3.9
Zhicong Sun,Tianliang Zhou,Ronghui Liu,Xueyuan Tang,Rong-Jun Xie
Near-infrared phosphor-converted light-emitting diodes (NIR-pc-LEDs) are superior to traditional NIR-LEDs in spectral modulation, volume, and cost, and their optoelectronic properties are dominantly controlled by the NIR phosphors, which thus boosts the search for high efficiency and broadband NIR phosphors. In this work, we attempt to realize ultra-broadband NIR phosphors by doping Cr 3+ in self-emitting SrHfO 3 with a weak crystal field. Dual emission bands centered at 770 (host) and 1000 nm (Cr 3+ ) are observed, leading to a wide spectral range of 700–1400 nm. The Cr 3+ ions enter the HfO 6 octahedron and thus produce an NIR emission with a full width at half maximum of 190 nm and an internal quantum efficiency of 24% under 460 nm excitation. A prototype NIR-pc-LED surface light is demonstrated for machine vision by using NIR-pc-LEDs that combine the blue LED with SrHfO 3 :Cr. The work paves an avenue for designing super-broadband NIR phosphors by doping Cr 3+ or other ions into hosts with self-trapped exciton emission (e.g., halide perovskites).
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