Catalysis Science & Technology
·
2025
·
IF 4.2
Yuangong Ma,Youlin Huang,Wensheng Zhang,Zhishan Liang,Bo Ding,Dongfang Han,Dongxue Han,Li Niu
In the domain of photocatalysis, harnessing solar energy, particularly the near-infrared (NIR) spectrum, presents formidable challenges. To overcome these, a novel NIR-responsive photocatalyst, denoted as NYT@ZnO@RGO@Ag, was meticulously crafted. This photocatalyst comprises a NaYF4: Yb3+, Tm3+@ZnO structure supported on reduced graphene oxide (RGO) and further composited with silver nanoparticles. It was rigorously evaluated for its performance in photodegrading tetracycline (TC) antibiotics as a model compound. Leveraging the unique properties of upconversion materials, wide bandgap semiconductors, and localized surface plasmon resonance (LSPR), the NYT@ZnO@RGO@Ag catalyst exhibited an impressive photodegradation rate of 93.6% for TC under NIR light exposure. This efficiency surpassed that of NYT@ZnO (38.2%) and NYT@ZnO@RGO (72.3%). The remarkable enhancement in NIR-driven photocatalysis observed in NYT@ZnO@RGO@Ag is primarily attributed to the efficient process of fluorescence resonance energy transfer (FRET) from NYT to its each component. This process enhances photo-induced carrier generation and facilitates efficient transfer and energy utilization under NIR irradiation. The present study offers a promising approach for NIR-driven photocatalytic degradation of pollutants in environments with limited light exposure or even under dark conditions.
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MODERN PHYSICS LETTERS B
·
2025
·
IF 2.2
Yongqiang Li,Changchun Ding,Yuxiang Wu,Bin Duan,Rangrang Fan,Fengyi Wang,Tong Liu,Wei Jin,Junshan Hu
In this work, a single near-infrared (NIR) upconversion phosphor of Yb 3 + /Er 3 + co-doped CaY 2 O 4 was prepared using an equivalent substitution strategy. The CaY 2 O 4 structure features a (R 2 O 4 ) 2 -framework of double octahedra, with rare earth ions located within the framework. When irradiated with a 980 nm near-infrared (NIR) laser, the phosphor emits 829 nm NIR light. The main excitation mechanism of the NIR emission was explained by the characterization of power dependence, absorption spectrum, and down shift-conversion spectra. The energy transfer (ET) process is the promotion of Er 3 + ions from the 4 I 1 3 ∕ 2 energy level to the 4 F 9 ∕ 2 energy level, and finally relax to 4 I 9 ∕ 2 energy level. The phosphor has potential application value in the biomedical field and bio-imaging due to its emission of NIR upconversion luminescence.
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DYES AND PIGMENTS
·
2023
·
IF 4.5
Fuhua Gao,Wasim Ullah Khan,Zhiyuan Cheng,Waheed Ullah Khan,Iqtidar Ahmad,Zhiqi Ye,Shenghong Yang,Yueli Zhang
Broadband near-infrared (NIR)-emitting materials have critical applications in biology, medical detection, and NIR night-vision. However, developing NIR phosphors with promising optical properties and excellent thermal stability is a great challenge for research. In this work, a novel NIR phosphor Cr 3+ and Yb 3+ doped CaSc 2 O 4 (CSO) is an evolving NIR emitting phosphor with decent optical properties , boosted emission intensity, and thermal stability that makes it a promising candidate with potential applications in NIR-LED and infrared night-vision. The implications of the fundamental electronic structure of CSO, including valence-band (VB) and conduction-band (CB) orbital character, are investigated. Under blue light excitation, CSO:Cr 3+ is settled with pure broadband NIR emissions (max = 920 nm, FWHM (full width at half maximum) = ∼310 nm) and good thermal stability . The occupation of two selectable lattice sites of Cr 3+ in CSO is discussed in detail. Furthermore, emission enhancements of samples are done by Cr 3+ and Yb 3+ codoping, effectively broadening FWHM to 351 nm and reducing thermal quenching. The energy transfer (ET) routes in CSO:Cr 3+ ,Yb 3+ are investigated based on PL lifetime and comprehensive kinetic ET model, revealing that the PL enhancements by Cr 3+ and Yb 3+ codoping mainly originate from the ET from Cr 3+ to Yb 3+ emitters with more efficient and thermally stable. Finally, an InGaN-LED device encapsulated using CSO:0.01Cr 3+ and CSO:0.01Cr 3+ ,0.01 Yb 3+ phosphor was fabricated. The fabricated NIR pc-LEDs are excellent candidates for NIR light sources in biological imaging and NIR night vision.
研究领域:
光学材料
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生物医学成像
·
光电子学
·
无机发光材料
·
红外技术
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固态照明
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纳米生物技术
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CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 29
·61520-61530
·
IF 5.6
Yunlong Li,Dan Zhang,Taifang Zhang,Lingxuan Zhou,Peng Wang,Vesna Đorđević,Valery F. Gremenok,Miroslav D. Dramićanin,Chonggeng Ma
Environment-friendly Fe 3+ ions as near-infrared (NIR) activators have garnered significant attention in intelligent NIR light sources; however, designing wavelength-tunable and outstanding thermal stability Fe 3+ -doped NIR luminescent materials remains a formidable challenge. In this study, we synthesized a novel garnet-structured NIR phosphor Y 2 CaAl 4 SiO 12 : Fe 3+ , Yb 3+ and investigated its luminescent properties and energy transfer mechanisms. Under 270 nm ultraviolet light excitation, Y 2 CaAl 4 SiO 12 : Fe 3+ demonstrates broadband NIR emission peaking at 803 nm, characterized by a full width at half maximum (FWHM) of 107 nm and exhibiting a remarkably high internal quantum efficiency (IQE) of 91.70 %, which is markedly superior to most reported Fe 3+ doping NIR-emitting materials. Notably, the incorporation of Yb 3+ ions facilitates an efficient energy transfer process from Fe 3+ to Yb 3+ , which not only significantly broadens the emission spectrum but also enhances the thermal stability of Fe 3+ (I 373 K /I 298 K = 59.24 %) compared to the singly Fe 3+ doped sample (I 373 K /I 298 K = 45.30 %). Finally, the optimized Y 2 CaAl 4 SiO 12 : Fe 3+ , Yb 3+ NIR phosphor exhibits promising potential for anti-counterfeiting applications.
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MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Ming Yang,Shun An Chen,Qian Ru Lin,Tao Pang
In this paper, upcovnerison luminescence in Er3+/Yb3+ co-doped NaYF4 nanophosphors was regulated by changing the Er3+ concentration. With increasing the Er3+ concentration, the green and red emissions increased first and then decreased, but the intensity ratio of red to green emission decreased monotonically. To clarify the role of Er3+ doping, the factors including crystal structure, morphology and size of particle, photon absorption, energy transfer, multi-phonon relaxation, population of emissive levels and emission probability of radiative transitions were considered and analyzed. More importantly, we proposed a simple method for discussing radiation transitions based on luminescence temperature sensing.
研究领域:
材料科学
·
光学
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JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Hao Tang,Ying Xu,Xianhua Cheng
In this study, Cr 3+ and Mg 2+ co-doped β-NaYF 4 :Yb 3+ /Er 3+ (NYFYE) microcrystals were synthesized for the first time by the facile hydrothermal method . Cr 3+ and Mg 2+ co-doping was confirmed to influence the structure, morphology and UCL property of NYFYE microcrystals. The growth mechanism of NYFYE microcrystals doped with different Cr 3+ and Mg 2+ was discussed in detail. With 16 mol% Cr 3+ and 4 mol% Mg 2+ co-doping into NYFYE, the UC emissions were enhanced to 7 times (green) and 4 times (red) higher than those of the undoped counterpart, and the mechanism was explored by considering the different roles of Cr 3+ and Mg 2+ , the surface quenching and concentration quenching effects. This finding suggests the co-doping of two different impurity ions may be a better approach than corresponding single impurity ion doping for morphology control and UCL intensity enhancement, which is instructive for high performance UC crystals design.
研究领域:
材料科学
·
光学
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2018
·
IF 2.207
Yong Shi,Fengming Yang,Chuanzhen Zhao,Yan Huang,Mengzhu Li,Qingjun Zhou,Qiuyue Li,Zepeng Li,Junming Liu,Tong Wei
Up-conversion (UC) oxides comprise a huge family of materials with abundant optical functionalities and they merit extensive research. Some members of this family have been modified with proper rare earth (RE 3+ ) ions and their importance has recently been established in non-contact temperature sensors , although the thermal sensitivity (S) value was still low. In this study, we investigated Nd 3+ and Yb 3+ sensitized Ba 4 La 2 Ti 4 Nb 6 O 30 (BLTN:xNd 3+ /Yb 3+ ) with a tungsten bronze structure for use as optical thermometers for the first time. Under excitation at 980 nm, obvious near-infrared emissions corresponding to 4 F 7/2 / 4 S 3/2 → 4 I 9/2 , 4 F 5/2 / 2 H 9/2 → 4 I 9/2 , and 4 F 3/2 → 4 I 9/2 transitions were observed, and the UC mechanism involved was elaborated. Furthermore, the UC thermometric properties were investigated according to the fluorescence intensity ratio technique and the maximum S values determined for BLTN:xNd 3+ /Yb 3+ (x = 0.12 and 0.16) samples were both higher than 0.03 K –1 . The potential of BLTN:xNd 3+ /Yb 3+ for use in optical thermometers was estimated based on comparisons with other active materials.
研究领域:
材料科学
·
光学工程
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DYES AND PIGMENTS
·
2018
·
IF 3.767
Peng Li,Linna Guo,Zongxue Zhang,Tiesheng Li,Penglei Chen
A series of Bi 2 O 3 :Yb 3+ /Er 3+ phosphors with different phases and morphologies were obtained by tuning doping ions, which played a vital role in the upconversion luminescence (UCL). Both Er 3+ single doped and Yb 3+ /Er 3+ co-doped samples exhibit narrow, nearly pure red emission whether excited by 980 nm or 1550 nm. Compared to the sum of emission intensities excited by two single-wavelength (980 nm and 1550 nm) separately, the red emission from Bi 2 O 3 :Yb 3+ /Er 3+ with uneven distributed nanometer or micron blocky particles structure excited by two-wavelength simultaneously was enhanced by a factor of 2.41. To further improve the UCL intensity, optical-inert ions such as Na + , Ca 2+ and Gd 3+ were doped into this system. Compared to the optical-inert ions free sample (Bi 2 O 3 :15% Yb 3+ , 2% Er 3+ ), the pure red UCL in Bi 2 O 3 :15% Yb 3+ , 2% Er 3+ with 6% Na + , 2% Ca 2+ and 4% Gd 3+ doping is enhanced by 223.83 or 203.73 times under 980 or 1550 nm excitation, respectively. Meanwhile, the UCL mechanism under the multiwavelength was investigated in detail and its model of UC emission process was proposed.
研究领域:
材料科学
·
光学
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Advanced Optical Materials
·
2026
·
IF 7.2
Bing-Jun Zhu,Jiacheng Liu,Yang (Michael) Yang,En Ma,Jia-Jun Yan,Heng-Yun Ye,Le-Ping Miao
With the continuous improvement of the efficiency of photodetectors in the near-infrared (NIR) region in recent years, NIR scintillator materials have attracted more and more attention from researchers. Current scintillator materials either emit in the visible region or have low light yield in the NIR region. Herein, we describe efficient NIR scintillation by doping Yb 3+ in lead-free halide double perovskites (DP) Cs 2 NaYCl 6 . Its light yield reaches 93295 photons·MeV −1 , and the detection limit is as low as 4.2 µGy air ·s −1 upon radiation with 20 keV X-ray. Moreover, it exhibits great irradiation hardness, maintaining 96% of its initial scintillation intensity after exposure to an X-ray dose of 6.66 Gy air . A flexible scintillator film Cs 2 NaYCl 6 : Yb 3+ @PDMS with an area of 100 cm 2 is prepared by combining the material with PDMS as a carrier and successfully applied to X-ray imaging. The spatial resolution of the scintillation screen is determined to be 10 lp·mm −1 using line-pair phantoms and modulation transfer function (MTF). This finding reveals that lead-free halide perovskites are attractive functional materials suitable for matrices of NIR scintillation materials.
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CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Zonglin Lv,Yalin Qin,Yongcheng Zhang,Jingjing Fu,Chaojing Lu
To date there is no report on the photoluminescence property in Pr 3+ /Yb 3+ co-doped or Pr 3+ single doped ferroelectrics Pb(Mg 1/3 Nb 2/3 )O 3 –PbTiO 3 , abbreviated as PMN-PT. This letter presents the efficient upconversion (UC) luminescence in 0.75PMN-0.25PT:1.5%Pr/ y Yb transparent ceramics together with luminescence mechanism. When the transparent ceramics were excited by 980 nm laser, strong visible UC emissions at 491, 529, 539, 623, 649, 685, 710 and 737 nm were detected, besides strong near-infrared down-conversion emissions of Pr 3+ at 1061 nm and of Yb 3+ around 1006 nm. The visible UC emission was found to be a two-photon process and sensitized by Yb 3+ . The intensities of the visible UC emissions saturate at higher pump power above 1.65 W when the Yb 3+ concentration y ≥ 3%. The intensity saturation results from the depletion of ground state population and reverse energy transfer in cross-relaxation way. Relative to the intensities of the red emissions, those of the blue-green emissions decrease remarkably as the Yb 3+ content increases. This interesting phenomenon can be attributed to the higher local symmetry of Pr 3+ sites in the ceramics of higher Yb 3+ content. The various photoluminescence properties and excellent ferroelectric properties make our Pr 3+ /Yb 3+ -doped transparent ceramics promising multifunctional optical luminescence materials.
研究领域:
材料科学
·
光子学
·
铁电材料
·
光学材料
·
发光
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高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Wei Xu,Yuwei Hu,Longjiang Zheng,Zhiguo Zhang,Wenwu Cao,Hailong Liu,Xijun Wu
Rare earth ions doped luminescent materials have demonstrated their potentiality as sensitive thermometers with good accuracy and high spatial resolution. Nevertheless, low luminescence efficiency, especially at high temperature, still limits the development of this thermometry technique. Here, Nd 3+ /Yb 3+ codoped CaWO 4 phosphors were synthesized using high temperature solid-state method, and Li + ions were introduced aiming to improve the near-infrared (NIR) emissions from Nd 3+ in the spectral range of 725–950 nm. The influence of Li + codoping on the structure and NIR luminescence in CaWO 4 : Nd 3+ /Yb 3+ when excited by a 980 nm laser diode was investigated. NIR-NIR emissions from Li + codoped samples are successfully strengthened compared with that without Li + ions, which is mainly attributed to the distortion of the crystal structure and the increase of crystalline size by Li + . The optical temperature sensing behavior of NIR luminescence from Nd 3+ was studied based on fluorescence intensity ratio (FIR). Assisted by Li + ions, the NIR-NIR emissions are observed to be effectively enhanced with the increment of temperature. And a new pair of thermally coupled levels in Nd 3+ ions with excellent thermometry characteristics is explored, through which superior measurement sensitivity as well as accuracy could be achieved. In addition, light-induced temperature rise was realized in the phosphors, which makes CaWO 4 : Nd 3+ /Yb 3+ /Li + excellent candidate for luminescence thermometry and optical heaters.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Z.T. Chen,E.H. Song,M. Wu,S. Ding,S. Ye,Q.Y. Zhang
In contrast to common multiple upconversion (UC) emission characteristic from Ho 3+ , intense single-band red UC emission is realized in perovskite KZnF 3 : Mn 2+ ,Yb 3+ ,Ho 3+ nanocrystals via controlling the doping concentration ratio of Mn 2+ to Ho 3+ . Based on stokes emission, UC luminescence and energy levels of Mn 2+ and Ho 3+ , a bidirectional energy transfer from the 5 S 2 / 5 F 4 state of Ho 3+ to the 4 T 1 ( 4 G) state of Mn 2+ or | F 2 7 / 2 , T 4 1 ( G 4 ) 〉 state of Yb 3+ -Mn 2+ dimer, then to 5 F 5 state of Ho 3+ (ET2) is provided to explain the unique UC emission behaviors of KZnF 3 : Mn 2+ ,Yb 3+ ,Ho 3+ . The effects of dopant concentration on the UC luminescence properties of KZnF 3 : Mn 2+ , Yb 3+ , Ho 3+ is investigated in detail. Analysis of the dominant red UC emission of KZnF 3 : Mn 2+ , Yb 3+ , Ho 3+ under different laser pulse width excitation indicates the energy transfer process . The special temperature dependent UC luminescence for Mn 2+ doped and Mn 2+ freely doped KZnF 3 :Yb 3+ , Ho 3+ further confirm the bidirectional energy transfer mechanism in the UC process. The study of these single-band red UC nanocrystals provides deep insights into the understanding of bidirectional energy transfer in UC mechanism, offering the possibility for applications in biolabels and bioimaging.
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