ACS Applied Materials & Interfaces
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2025
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IF 8.2
Bo Liu,You Li,Sai Xu,Jianglong Chang,Yuefeng Gao,Hongquan Yu,Yichao Wang,Baojiu Chen
Lead-free double perovskite (DP) materials have garnered growing interest because of their outstanding optoelectronic attributes. Nevertheless, realizing efficient, multimodal photoluminescence (PL) with adjustable emission spectra within single-host DP materials still poses a formidable hurdle. Herein, Er-based lead-free DPs (Cs2NaErCl6) were developed, which achieves downshift (DS) emissions from visible to near-infrared (NIR) and multicolor upconversion (UC) emissions, resulting from the abundant energy levels of Er3+ ions. Alloying with Yb3+ introduces new Yb3+-Er3+ cross-relaxation (CR) pathways, leading to a 308.5-fold increase in DS red emission and achieving a maximum color purity of 98.63%. Additionally, Yb3+ alloying enhances UC luminescence by 10.8-fold due to its strong absorption cross section around 980 nm. The colors of the UC emission can be adjusted by altering the doping concentration of Yb3+ and laser power density. Spectral analysis and theoretical calculations reveal the high compatibility of Yb3+ ions with Cs2NaErCl6, and the critical role of CR and energy-transfer processes in achieving efficient, tunable, and multimodal PL. Furthermore, the developed DP materials have been utilized in anticounterfeiting, information encoding, and narrow-band NIR photodetectors, expanding the versatile uses of rare-earth (RE)-based DP materials in the optoelectronics field.
研究领域:
材料科学
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光学
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光电子学
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产品关联
DOI
PubMed
高影响因子
Coatings
·
2021
·Vol. 11
·期 3
·282
·
IF 2.881
Jun Fang,Wenting Liu,Wenying Zhou,Cheng Zhu,Yaru Ni,Liang Fang,Chunhua Lu
Spectral adjustment is an effective method to increase light conversion efficiency of solar cells and to promote the growth of plants. Down-converter (DC) materials are considered to be one of the most effective methods of spectral modification. The focus of this work was to expand the spectral response range of down-conversion layers to achieve multipeak absorption and emission. Sr2CaMoO6:Sm,Na and YVO4:Bi,Eu, which have different excitation peaks in the UV-blue region and varied emission peaks in visible light regions, were prepared in this work. Sr2CaMoO6:Sm,Na can effectively produce red light at 648 nm upon excitation at 408 nm, while YVO4:Bi,Eu can produce red light at 618 nm upon excitation at 365 nm. Polymeric luminescent coatings with one single kind of phosphor were prepared separately before the two phosphors were mixed together in uniform polymer coatings. The two phosphors were also assembled in bilayer coatings with different concentrations. The results showed that high transmittances over 90% were achieved for the two composite coatings with the thickness of 20 and 30 μm. The increase in particle loadings from 1‰ to 4‰ slightly decreased coating transmittance but increased luminescence intensity. The increase in the ratio of Sr2CaMoO6:Sm,Na and YVO4:Bi,Eu from 5/1 to 10/1 resulted in high transmittance of the DC coatings, independent of total filler loadings (3‰ and 4‰) and coating thickness. The relative intensities of emission peaks can be adjusted conveniently by changing filler ratios. In addition, the transmittance and luminescent intensities of the coatings where the two phosphors were assembled in two layers were close to the uniform coatings, suggesting the negligible effect of UV light irradiation order. This work proved that the prepared coatings presented multipeak absorption and emission upon UV light excitation. These coatings can be expected to be applied in fields such as solar cells and agriculture greenhouses.Keywords:Sr2CaMoO6:Sm,Na;YVO4:Bi,Eu;polymeric luminescent coatings;down-conversion
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
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2025
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IF 3.2
Zehui Chen,Mengyan Cao,Zhihui Rao,Xiao Gong
Lanthanide ion-doped metal halides are a promising class of fluorescent materials. In this paper, we investigated the optical properties and photophysical mechanism of Er3+, Yb3+-doped Cs2NaScCl6 phosphor. It was demonstrated that in both up-conversion (UC) and down-shifting emission modes, the increase of Yb3+ concentration resulted in enhancement of the 4F9/2 → 4I15/2 emission of Er3+ in Cs2NaScCl6. In particular, UC emission gradually shifts from green to yellow with the enhancement of the excitation power density observed in Yb3+-rich systems. The complex cross-relaxation behavior between Yb3+ and Er3+ results in these phenomena. New paradigms are provided for the development of multimodal and dynamic fluorescent anticounterfeiting materials.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
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2020
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IF 2.779
Zhi-yong Yu,Shu-wang Duo
Fluorescent carbon dots (CDs) are promising zero-dimensional carbon nanomaterials with semiconductor-like properties, which have attracted tremendous attention owing to their fascinating features such as excellent optical performance, chemical inertness, and low toxicology. In this investigation, Mg-doped CDs (Mg-CDs) with up- and down-conversion fluorescence (FL) were prepared within 2 min through a one-pot, facile and ultrafast microwave method. The obtained Mg-CDs showed excitation-independent blue emission and were potentially applied for the detection of hematin based on the strong inner filter effect (IFE). The FL intensity ratio ( I 0 / I ) of the synthesized Mg-CDs were proportional to the concentration of hematin in the range of 0.1–75 μM with the limit of detection of 25 nM for Mg-CDs-0.1 and 0.01–25 μM with the limit of detection of 1 nM for Mg-CDs-0.5. Overall, this selective and sensitive assay using Mg-CDs obtained through the current microwave method was believed to demonstrate significant application prospects in complex matrices owing to its simplicity and specificity for hematin.
研究领域:
材料科学
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分析化学
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生物医学
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产品关联
DOI
高影响因子
OPTICS EXPRESS
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2019
·Vol. 27
·期 20
·28480-28493
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IF 3.561
Shuyan Lin,Shuyan Lin,Guanjun Tan,Guanjun Tan,Jinhui Yu,Enguo Chen,Yalian Weng,Xiongtu Zhou,Sheng Xu,Yun Ye,Qun Frank Yan,Tailiang Guo
We propose and fabricate a multi-primary-color (MPC) quantum-dot down-converting film (QDDCF). A four-primary-color QDDCF composed of red (R), yellowish green (YG), bluish green (BG), and blue (B) subpixels was fabricated via totally five rounds of photolithographic processes. A verification platform was built up using a laser projector, and the measured results show that the QD film can expand display color gamut to 118.60% of Rec. 2020 and can cover the entire Pointer’s gamut. The issues of blue light absorption and film thickness are analyzed in detail. The combination of MPC technology and QDDCF is a potential strategy to realize ultra wide color gamut for emerging display technologies.
研究领域:
材料科学
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光学工程
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显示技术
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Songbin Liu,Long Yan,Qiqing Li,Jinshu Huang,Lili Tao,Bo Zhou
Lithium-sublattice nanoparticles have recently shown to be a promising nano-sized host candidate for photon upconversion of lanthanides. However, it remains a challenge for the controllable synthesis of high-quality lithium-sublattice core-shell nanostructures due to its tetragonal crystal structure in contrast to the commonly investigated hexagonal (or cubic) sodium-sublattice counterparts. Herein, we present a novel synthetic strategy of using the pre-synthesized optically-active (sensitive or emissive) seeds to guide the epitaxial growth of LiGdF 4 -based core-shell nanostructures. By further constructing the Gd 3+ -mediated interfacial energy transfer in such nanoparticles , both upconverting and down-shifting emissions from a set of lanthanide ions including Eu 3+ , Tb 3+ , Dy 3+ , Sm 3+ and Nd 3+ were realized. Such core-shell nanoparticles also show good spectral Stark-splitting feature owing to their lower local structural symmetry compared to other nano-sized hosts. Moreover, the tri-channel emission from a single nanoparticle was achieved by integrating upconverting and down-shifting emissions under the dual wavelength excitations (980/254 nm), exhibiting a great promise in the multiple anti-counterfeiting identification. These results open a door to the research on new kinds of efficient luminescent nanomaterials, and further help the design of multi-functional nanostructures towards emerging cutting-edge applications.
研究领域:
材料科学
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光学
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纳米技术
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
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IF 4.3
Yushuang Hong,Zhengpei Nie,Xuelian Tian,Jingfang Sun,Qiuju Zhou,Wenbin Liang,Shihong Chen,Jin Huang,Kejun Tan,Lin Dong
In this work, up- and down-conversion dual-emission CDs without rare-earth (UD D-CDs) were synthesized using RhB and 1,4-Diaminoanthraquinone as precursors. The synthesized UD D-CDs exhibited dual emissions at 496 and 580 nm under 260 and 865 nm excitation, respectively. The fluorescence emission mechanism, including contributions from carbon nuclei, surface states, molecular states, and internal defect states, was discussed through the separation and purification of UD D-CDs. Based on the interaction between UD D-CDs and copper ions (Cu 2+ ), a dual-mode ratio fluorescence probe was developed to detect and quantify Cu 2+ . The up-conversion ratio fluorescent probe shows a linear range of 0.0500–15.0 μM, with a detection limit as low as 2.76 nM. This method has been successfully applied to detecting Cu 2+ in human serum and has potential applications in biochemical analysis and biological imaging. The successful preparation of up-conversion fluorescent carbon dots without rare earth elements and the ability to perform low-damage detection in high-background biological samples provide a new approach to constructing non-rare earth up-conversion probes.
研究领域:
分析化学
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生物医学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
ANALYST
·
2019
·Vol. 144
·期 24
·7421-7431
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IF 4.019
Wanyu Zhang,Lihua Jia,Xiangfeng Guo,Rui Yang,Yu Zhang,Zhenlong Zhao
Carbon dots (CDs) are a developing stable, conductive, and environmentally friendly fluorescent nanomaterial with potential applications in biomedicine and sensing. In this study, CDs with up- and down-conversion photoluminescence characteristics were prepared via a one-pot hydrothermal method using coffee beans as the sole raw material. Fourier transform infrared spectra and X-ray photoelectron spectroscopy showed the presence of nitrogen and oxygen functional groups on the CDs surfaces. Transmission electron microscopy showed that the CDs were spherical with an average size of 4.6 nm. The CDs precursor and synthesis process are environmentally benign, and the resulting CDs exhibit excellent photostability, reversible fluorescence response to temperature, and good ionic-strength tolerance. Moreover, these CDs can be used as efficient fluorescence probes in selective and sensitive Fe3+ detection by a dual-readout assay. The down- and up-conversion fluorescence measurements from the CDs were in the linear range for 0–0.10 mM Fe3+ with the detection limits of 15.4 and 16.3 nM, respectively. Furthermore, the CDs were successfully applied to intracellular sensing and imaging Fe3+ ions, indicating their potential use in bioscience applications.
研究领域:
材料科学
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生物医学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
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2017
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IF 2.446
Chunlong Han,Li Luo,Guoshuai Dong,Wei Zhang,Yinhai Wang
Novel YAG:Ce 3+ , Pr 3+ , Yb 3+ phosphors were synthesized using a high temperature solid state reaction method. The XRD patterns revealed that the obtained samples belong to the single phase YAG. The optical spectra demonstrated that Pr 3+ could be a bridge to facilitate the energy transfer from Ce 3+ to Yb 3+ in the YAG host. Blue light excited Ce 3+ and a yellow emission from Ce 3+ together with a near infrared emission of Yb 3+ was obtained. The effect of Pr 3+ doping on the energy transfer efficiency was explored. When the doping concentration of Pr 3+ increased, the yellow emission intensities of Ce 3+ decreased and the near infrared emission intensity of Yb 3+ increased monotonously. Hence, the efficiency of energy transfer from Ce 3+ to Yb 3+ is enhanced by the addition of Pr 3+ , implying that the YAG:Ce 3+ , Pr 3+ , Yb 3+ phosphors are promising downshifting materials and have the potential to be used in Si-based solar cells.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Meiting Li,Bo Chen,Chi Zhang,Xuejiao Wang,Fufa Wu,Rongda Zhao
Tartrate (Tar 2− ) was originally employed as a chelating/structure-directing agent for hydrothermal synthesis of CdWO 4 :Yb 3+ ,RE 3+ (RE = Ho and Er) micro/nanocrystallites, followed by calcination at 700 °C for 2 h. It was clearly demonstrated that Tar 2− restricted the exposed ab planes and 3D self-assembly of microplates, resulting in ∼50 nm sized nanoparticles . Up-/down-conversion (UC/DC) photoluminescence were revealed to be strongly size dependent. Under 978 nm pump laser excitation, flower-like assembly was found to exhibit the stronger UC emissions of Ho 3+ and Er 3+ , among which two CdWO 4 :Yb 3+ ,Ho 3+ phosphors generated orange-yellow fluorescence via three-photon processes, while CdWO 4 :Yb 3+ ,Er 3+ microflowers and nanoparticles showed yellowish-green and pale green colors, respectively. Moreover, nanoparticles intensified the dominant green DC emissions of Ho 3+ and Er 3+ by ∼3 and 2 times, implying the pivotal roles of morphology engineering in tunable photoluminescence . This research may provide insights into crystallite/architecture engineering and luminescence optimization for near-infrared response solar cells and solid-state lighting.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
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IF 3.7
Hao Ren,Shoujun Ding,Yuhang Zheng,Chuancheng Zhang,Miaomiao Wang,Yong Zou,Wenpeng Liu,Lu Cheng
Fluorescence intensity ratio thermometry represents a novel non-contact approach for rapid and precise temperature measurements. In this study, a Yb,Er co-doped Gd 3 Sc 2 Al 3 O 12 single crystal (Yb,Er:GSAG) was investigated, exploiting the dual-mode luminescence of upconversion and downconversion for optical temperature sensing applications. The crystal exhibited distinct luminescence behaviors when subjected to 266 nm, 355 nm, and 980 nm laser excitations , manifesting a dark blue appearance under 266 nm ultraviolet (UV) excitation and a green hue under 355 nm and 980 nm excitations. Specifically, under 355 nm excitation, the crystal demonstrated a predominantly pure green upconversion, with a green-to-red ratio of 38. For the first time, we propose an investigation into the temperature sensing behavior under dual-mode luminescence in the same crystal, utilizing the fluorescence intensity ratio of the 2 H 11/2 and 4 S 3/2 thermally coupled energy levels of Er 3+ . The obtained maximum relative sensitivities ( S R ) for the two fitted luminescence modes were found to be 101.80×10 −4 K −1 at 300 K (980 nm excitation) and 126.39×10 −4 K −1 at 300 K (355 nm excitation), respectively. The impressive S R values substantiate Yb,Er:GSAG crystal as highly promising candidates for optical temperature sensing applications.
研究领域:
光学材料
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物理化学
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温度测量技术
✓ 已验证
DOI
高影响因子
APL Materials
·
2024
·Vol. 12
·期 9
·
IF 5.3
Shen Tiantian,Zhao Shanshan,Su An,Liu Haisheng,Chen Fayi,Li Benchun,Han Xinxin,Yu Dechao,Zhang Dawei
The Pr 3+ ion has been widely doped into various materials as a red and near-infrared (NIR) emitting center for applications in lighting and solar spectrum downconversion. Herein, the preparation of a new library of Pr 3+ -doped Sr 2 Al 2 GeO 7 phosphors was proved by powder x-ray diffraction patterns and Rietveld refinements and characterized by a scanning electron microscope with energy-dispersive x-ray spectrometry. The Sr 2 Al 2 GeO 7 :Pr 3+ sample strongly absorbs blue photons over 420–500 nm and yields intense visible emissions with dominant peaks around 490 nm from the Pr 3+ 3 P 0 → 3 H 4 transition, as well as robust NIR emission bands over 800–1200 nm. In addition to the typical transitions of 1 D 2 → 3 F 2 at 880 nm, 1 G 4 → 3 H 4 at 1000 nm, and 1 D 2 → 3 F 3,4 at 1070 nm, the distinguishable NIR emission at 929 nm was demonstrated from the 3 P 0 → 1 G 4 transition via static and dynamic spectroscopic analysis. Most interestingly, for the 3 P 0 blue-excited state, a considerably elevated concentration of about 10%Pr 3+ was optimal for the visible/NIR emissions, in stark contrast to the diluted optimal 1%Pr 3+ for the 1 D 2 state. The relevant cross-relaxation from the 3 P 0 and 1 D 2 states between Pr 3+ was comprehensively treated by theoretical speculations and experimental results. Such concentrated Pr 3+ blue activators would significantly facilitate the blue-to-NIR downconversion through a desired two-step sequential transition from the 3 P 0 initial state to the 1 G 4 intermediate level for quantum efficiency exceeding unity. The current results would consolidate the basis of concentrated Pr 3+ donors to promote the novel Pr 3+ /Yb 3+ codoping downconversion for greatly increasing Si solar cell efficiency.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）