Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 5
·1321-1329
·
IF 6.641
Daqin Chen,Yue Liu,Jiangkun Chen,Hai Huang,Jiasong Zhong,Yiwen Zhu
Efficient dual-modal luminescence is highly desired for applications in high security anti-counterfeiting. In the present work, Yb3+/Ln3+/Mn4+ (Ln = Er, Ho, and Tm) tri-doped Na3ZrF7 phosphors were fabricated via oil–water interface cation exchange using Yb3+/Ln3+:Na3ZrF7 as the exchanging hosts. The as-prepared products exhibited typical Mn4+ red down-shifting luminescence under UV light excitation and Er3+ red, Ho3+ yellow and Tm3+ near-infrared multi-color upconversion emissions under 980 nm laser excitation. The Mn4+ dopants in the Na3ZrF7 host experienced strong crystal-field strength Dq of 3.63 and showed superior thermal stability with up to 90% of the initial emission intensity retained at 448 K. Steady-state and time-resolved emission spectra verified that there was no detrimental energy transfer interaction between Mn4+ and Ln3+, enabling bright and eye-visible bi-functional emissions for the present products. As a consequence, the as-prepared phosphors were demonstrated to be applicable in anti-counterfeiting by a proof of concept experiment of fluorescent labeling for specially designed patterns.
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高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 33
·11337-11345
·
IF 4.099
Mengzhu Li,Yong Shi,Chuanzhen Zhao,Fengming Yang,Qiuyue Li,Xinxing Zhang,Shengcheng Wu,Haiyan Chen,Junming Liu,Tong Wei
A series of Er3+- and Yb3+-doped K2LaNb5O15 (KLN:xEr3+/Yb3+) up-conversion (UC) submicro-particles have been synthesized for the first time by a simple and low-cost molten salt (MS) approach. X-ray diffraction (XRD) was performed to analyze the phase and structure, and the prepared KLN:xEr3+/Yb3+ samples exhibited a single phase tetragonal tungsten bronze (TTB) structure. The morphologies were characterized by scanning electron microscopy (SEM), and submicro-rod-like particles were obtained for all samples. Under 980 nm excitation, KLN:xEr3+/Yb3+ emitted bright green and weak red emissions which arose from the intra-4f transitions of Er3+ ions. The UC emission intensities and RR/G (the intensity ratio between red and green emissions) were disclosed to be tightly dependent on the Yb3+ ion concentration, and the involved UC luminescence mechanism was studied. Meanwhile, the slope of log I–log P plots displayed an evident reduction with a Ts (sintering temperature) increase, which was ascribed to the saturation effect coming from the competition between UC processes and linear decay. Furthermore, temperature-dependent UC behavior and temperature sensing properties of KLN:xEr3+/Yb3+ were probed based on the fluorescence intensity ratio (FIR) technique of UC green emission. The maximum sensor sensitivity (S) of KLN:0.04Er3+/Yb3+ (Ts = 900 °C) and KLN:0.16Er3+/Yb3+ (Ts = 900 °C) was determined to be as high as 10.90 × 10−3 and 12.27 × 10−3 K−1, respectively. We also showed that the particle size has an evident influence on S, which can be qualitatively interpreted by J–O theory. Thermal-cycling measurements were conducted at different temperatures, and good reliability and repeatability were confirmed. In addition, an obvious optical heating effect was also realized and the variation of temperature induced with a laser was about 32 K. These results reveal that KLN:xEr3+/Yb3+ submicroparticles with high sensor sensitivity and an obvious laser-induced thermal effect are suitable for future optical thermometers and optical heaters.
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高影响因子
RSC Advances
·
2014
·Vol. 4
·期 100
·57048-57053
·
IF 3.708
Hong Liu,Ping Liu,Xiangming Su,Jie Liu,Xiaoqing Li,Hongde Luo,Zhiling Yao,Xibin Yu,Ming Zhan
Highly crystallized micro/nano-sized Y2O2S and RE (Eu3+, Yb3+/Er3+) doped samples were prepared through a one-pot mild (200–250 °C) solvothermal method. By simply adjusting the amount of initial sulfur powder, the morphology and assembled nano-structures could be well controlled. With varying concentration of sulfur powder from 0.08 M to 0.8 M, the morphology and size of the target products varied from 20 nm nanosheets, 2 μm sheet-assembled plates/flowers to 1.5 μm nano-assembled spheres. The luminescence properties of Eu3+ doped Y2O2S with different morphologies were studied. The excitation peak above 300 nm ascribed to S2−–Eu3+ charge transfer showed a blue shift of 9 nm compared with the bulk sample. When co-doped with Yb3+/Er3+, the Y2O2S:Yb3+, Er3+ nano-aggregates exhibited a tunable emission under 980 nm laser excitation, shifting from greenish-yellow to orange-yellow, with increasing Yb3+/Er3+ ratio.
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JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
·
2022
·Vol. 39
·期 10
·2625-2636
·
IF 2.058
Hang Liu,Xingke Zheng,Pengcheng Wang,Haiyan Wang,Yuhong Zhang
In this work, a comparative study of the upconversion (UC) luminescence properties of ${{\rm Er}^{3 +}} {-} {{\rm Yb}^{3 +}}$-co-doped ${{\rm AWO}_4}$ (${\rm A} = {\rm Ba}$, Sr, and Ca) scheelite phosphors and ${{\rm Er}^{3 +}} {-} {{\rm Yb}^{3 +}} $-co-doped ${{\rm MgWO}_4}$ wolframite phosphors is reported. Under 980 nm excitation, all the samples emit green and red emissions. The ${{\rm Er}^{3 +}} {-} {{\rm Yb}^{3 +}}$-doped ${{\rm MgWO}_4}$ phosphor has a higher UC emission intensity. Furthermore, the optical temperature sensing properties in ${{\rm Er}^{3 +}} {-} {{\rm Yb}^{3 +}}$-co-doped ${{\rm AWO}_4}$ (${\rm A} = {\rm Ba}$, Sr, Ca, and Mg) phosphor samples are investigated. The relative sensitivity (${{\rm S}_r}$) based on thermally coupled levels (TCLs) increases gradually with an increase in matrix phonon energy. The absolute sensitivity (${{\rm S}_a}$) values of the samples are accurately predicted by the chemical bonding parameter (${{\rm f}_c}$). The results of the correlation between the UC luminescence properties and the microscopic crystal structure, and the relationship of the temperature sensitivity and the host parameters, provide us with a guiding insight for the selection of a host material with ideal temperature measurement capability.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Xintong Yao,Haoran Zhen,Dafeng Zhang,Junchang Liu,Xipeng Pu,Peiqing Cai
Constructing full spectrum photocatalyst is an effective strategy to improve the conversion efficiency of solar energy. In this work, BiOI:Yb 3+ ,Er 3+ /Bi 2 O 4 (BYE/BO) direct Z-scheme heterojunction photocatalysts were successfully synthesized by a fast and simple microwave-assisted hydrothermal method . XRD , XPS , FE-SEM, TEM , PL , DRS, and BET were used to investigate the physical and chemical properties of samples. Compared to pure BYE and BO, as-synthesized BYE/BO samples had significantly improved photocatalytic activity in the degradation of Ciprofloxacin and Rhodamine B when exposed to visible or near infrared light (NIR) light. Among them, 20% -BYE/BO has the best photocatalytic activity , and its NIR-light degradation ratio of Ciprofloxacin is as high as 66 and 103 times that of BO and BYE, respectively. The enhanced photoactivity of as-synthesized BYE/BO heterojunction is attributed to synergistic effects of the upconversion and the direct Z heterojunction . Moreover, capture experiment showed that the·O 2 - and h + were main active species, and the directive Z-scheme mechanism was proposed.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Tongshu Zhang,Yuheng Zhang,Fulong Hao,Huidong Xie,Zhihua Leng,Zuobin Tang
The development of highly efficient and thermally stable phosphors with ultra-broadband emission is critical to advancing the practical applications of portable near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs). Herein, we employ the chemical unit co-substitution strategy to quantitatively introduce Mg 2+ and Si 4+ ions into the garnet lattice, yielding the high-performance Lu 3 Ga 3 MgSiO 12 :Cr 3+ (LGMSO:Cr 3+ ) phosphor, which exhibits an ultra-broadband emission with a full width at half maximum (FWHM) of 181 nm and a photoluminescence quantum yield (PLQY) of 63.7 %. Structural analysis reveals that Mg 2+ -Si 4+ co-substitution induces multiple Cr 3+ occupancy within distorted (Ga/Mg)O 6 octahedra, broadening emission band via a multisite-induced effect, as confirmed by low-temperature spectral analysis (80 K) and crystal field calculations. Furthermore, co-doping with Yb 3+ enhances the emission bandwidth and thermal stability (from 48.4 % to 71.0 % at 423 K), attributed to the combined contributions of Cr 3+ emission ( 4 T 2 ( 4 F ) → 4 A 2 ) and Yb 3+ emission ( 2 F 5 / 2 → 2 F 7 / 2 ) excited via Cr 3+ energy transfer. Packaged LED devices show superior night vision and non-destructive biological penetration capabilities, highlighting the phosphor’s potential for NIR pc-LED applications.
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高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 27
·4887-4898
·
IF 3.756
Mingzhou Meng,Rui Zhang,Zhenlong Cheng,Xinmeng Fa,Jianghua Yang,Anees A. Ansari,Jun Ou,Christian Wurth,Ute Resch-Genger
A solvothermal method was used to prepare a series of Yb3+/Tm3+/Ca2+ co-doped NaYF4 nanoparticles with different Ca2+ contents. Strong upconversion blue fluorescence could be observed under 980 nm laser excitation of the samples. The effect of different Ca2+ contents on the luminescence intensity was investigated, and it was found that the UV-vis upconversion luminescence increased and then decreased with an increasing Ca2+ concentration during the increase of the Ca2+ content from 0 mol% to 25 mol%, reaching the strongest fluorescence at 15 mol%, which was up to about 28 times stronger than that without Ca2+ doping. Furthermore, the mechanism was investigated, and it was found that the doping of Ca2+ disrupted the symmetry of the crystal field, resulting in a significant enhancement of the overall fluorescence. Applied to fluorescence intensity ratio thermometry, the absolute and relative sensitivities are as high as 0.0418 K−1 and 2.31% K−1, respectively, with a minimum temperature resolution of 0.0129 K.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 30
·期 1
·212-220
·
IF 2.324
Hu Zhen,Zhao Li,Guo Haiyong,Wang Shimin,Li Wenlu,Yang Xiaojie,Dong Binghai,Wan Li
A novel composite double-layer film was developed using TiO 2 /La(OH) 3 :Yb 3+ /Er 3+ nanoparticles (P25/UC) and porous-hollow TiO 2 microspheres (PHTS) for highly efficient dye-sensitized solar cells (DSSCs). P25/UC was used as the first layer and coated onto fluorine-doped tin oxide glass substrate to create a good contact and upconversion effect. The P25/UC layer can absorb and convert infrared light into visible red and green light, increasing light utilization. PHTS has a large size and a high specific surface area, was deposited onto the surface of the P25/UC film to improve the light scattering performance and dye adsorption of solar cells. The P25/UC composite double-layer film (P25/UC + PHTS) achieved the highest short-circuit current density of 20.33 mA/cm 2 and photoelectron conversion efficiency of 8.89% due to the synergistic effect of the upconversion layers and light-scattering layers, which increased by 51.26% and 38.04% compared with that of the pure P25 film photoelectrode.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Zhen Hu,Li Zhao,Wenlu Li,Shimin Wang,Binghai Dong
A composite film was prepared by mixing NaLuF 4 :Yb 3+ /Er 3+ up-conversion luminescent material with commercial P25, and a scattering layer composed of flower-like TiO 2 was added on to the composite film (UC/P25) to form a double-layer composite film (UC/P25 + FT). An AgNO 3 solution was irradiated by ultraviolet light to deposit nano-Ag particles on the prepared double-layer film, and a nano-Ag modified double-layer film (UC/P25 + FT + Ag) was finally obtained. The synergistic effect of the three improved methods conferred the UC/P25 + FT + Ag film with a wide spectral absorption range, strong light-scattering ability, and strong light absorption capability, which greatly improved the photoelectric performance of the film. The maximum photoelectron conversion efficiency of dye-sensitized solar cells with the UC/P25 + FT + Ag photoanode reached up to 8.14%, which increased by 32.36% compared with that of the pure P25 film photoelectrode .
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chunyang Zhang,Yifan Wang,Zexiong Wang,Shilong Zhao,Ruoshan Lei,Shiqing Xu
The development of ultrasensitive thermometric phosphors has become an active area of research due to their appealing applications in the contactless temperature detection field. Herein, the scheelite-related compounds—CaGd 2 (WO 4 ) 4 : Nd 3+ , Yb 3+ and CaGd 2 (MoO 4 ) 4 : Nd 3+ , Yb 3+ , which exhibit high sensing capacity—are successfully prepared and systematically characterized. The X-ray diffraction analysis reveals that CaGd 2 (WO 4 ) 4 : Nd 3+ , Yb 3+ exhibits the monoclinic structure, whereas CaGd 2 (MoO 4 ) 4 : Nd 3+ , Yb 3+ is in the tetragonal phase. The maximum phonon cut-off energy of CaGd 2 (WO 4 ) 4 : Nd 3+ , Yb 3+ is 929 cm −1 , slightly larger than that of CaGd 2 (MoO 4 ) 4 : Nd 3+ , Yb 3+ (904 cm −1 ). Irradiated by 980 nm laser, PL spectra consist of the Nd 3+ : 4 F j → 4 I 9/2 (j = 7/2, 5/2, 3/2) and Yb 3+ : 2 F 5/2 → 2 F 7/2 emissions located in the near-infrared (NIR) range. Negative and positive thermal quenching behaviors are observed for the emissions of Nd 3+ (754, 802, and 868 nm) and Yb 3+ (1008 nm), respectively, attributed to the cooperative effects of the phonon-assisted energy transfer process of Yb 3+ → Nd 3+ and excited state absorption process of Nd 3+ . Moreover, the host material can affect the luminescence properties, thermal enhancement factor of the NIR anti-Stokes emission, and thermal sensing performance of the Nd 3+ -Yb 3+ pair. Consequently, CaGd 2 (MoO 4 ) 4 : Nd 3+ , Yb 3+ exhibits higher sensing sensitivity (S r-max = ∼6.00%K −1 ) than CaGd 2 (WO 4 ) 4 : Nd 3+ , Yb 3+ (S r-max = ∼5.56%K −1 ). This study provides useful information for the construction of high-performance ratiometric thermometers based on the inverse thermal dependence of the NIR emissions of Nd 3+ and Yb 3+ ions.
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高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 10
·4607-4616
·
IF 3.5
Xiaoqing Lai,Przemysław Woźny,Marcin Runowski,Laihui Luo,Peng Du
Tm3+/Yb3+-codoped ZrScW2PO12 microparticles were prepared in order to solve the problems of the severe thermal quenching and unsatisfactory thermometric properties of most luminescent materials. The synthesized materials exhibit a rarely observed negative thermal expansion (NTE) effect, which was verified by in situ X-ray diffraction experiments, performed under high temperature conditions. Upon excitation with a 980 nm laser, bright blue upconversion (UC) emissions originating from Tm3+ were observed. Moreover, owing to the promoted energy transfer, cross-relaxation and non-radiative decay processes at high temperatures triggered by the NTE effect, the observed UC emissions arising from 1G4 and 3F2,3 levels show non-monotonic responses to temperature. By analysing the temperature-dependent luminescence intensity ratio of these UC emissions originating from the non-thermally coupled levels of Tm3+ (1G4 and 3F2,3), the thermometric properties of the prepared microparticles were investigated in detail. Interestingly, the maximum absolute and relative sensitivities of the synthesized compounds are 0.09 and 1.45% K−1, respectively, which are independent of Yb3+ content, but they can be manipulated by employing different sensing modes. Our results manifest that the exploitation of the NTE effect is an efficient way to control the UC luminescence features of rare earth ions and to realize high performance optical thermometry.
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Laser & Photonics Reviews
·
2025
·
IF 10
Mengxin Liu,Jiejun Pan,Xinan Shi,Bingsuo Zou,Daocheng Pan
Rare-earth doped metal oxide nanocrystals with high visible luminescence have been widely used in lighting and display applications owing to their low toxicity, and excellent thermal and chemical stability. However, the room-temperature preparation of near-infrared (NIR) luminescent rare-earth doped metal oxide nanocrystals remains a challenge. Herein, sub-4 nm Yb 3+ /Nd 3+ -doped CaMoO 4 nanoparticles are prepared by a facile room-temperature ligand-assisted coprecipitation method, which can be completed within 1 min under ambient conditions. Short-chain butyric acid and butylamine as binary ligands play a crucial role in the synthesis of NIR luminescent nanoparticles. The as-prepared nanocrystals can be well dispersed in organic solvents such as chloroform since they are capped with butyric acid and butylamine. The energy transfers from MoO 4 2 − ${\rm MoO}^{2-}_{4}$ ions to Yb 3+ and Nd 3+ ions are systematically investigated in CaMoO 4 :Yb 3+ and CaMoO 4 :Nd 3+ nanoparticles, respectively. More importantly, this ultrafast and room-temperature synthesis strategy is particularly suitable for the large-scale preparation of Yb 3+ /Nd 3+ -doped CaMoO 4 nanoparticles (≈23 g) with NIR emission, which provides new ideas and possibilities for the commercial production of extremely small and NIR-emitting nanophosphors.
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