JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Wei Xu,Ying Cui,Yuwei Hu,Longjiang Zheng,Zhiguo Zhang,Wenwu Cao
CaWO 4 phosphors doping with different Er 3+ and Yb 3+ ion concentrations were synthetized through high temperature solid-state reaction technique. Excited by 980 nm laser, the influence of rare earth dopant concentration on the thermometry behavior of Er 3+ green upconversion emissions was discussed via the fluorescence intensity ratio method. Superior temperature sensing ability could be achieved in CaWO 4 : 0.1 mol% Er 3+ -3 mol% Yb 3+ , the maximum sensitivity of which is about 1.05 × 10 −2 K −1 at 439 K. Meanwhile, the pumping laser induced thermal effect on the saturation of upconversion emission intensity has been preliminarily studied. The temperature of the irradiation spot on sample caused by the exposure of excitation laser is observed to be greatly enhanced as the pumping power increased. Based on the steady-state rate equations and the temperature dependence of luminescence decay curves, theoretical calculations have been performed. The results confirm that the laser induced heating effect plays an important role in the luminescence intensity saturation phenomenon.
研究领域:
光学材料
·
光子学
·
传感器与传感技术
·
发光光谱学
·
固态物理
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 24
·7378-7385
·
IF 6.641
Leipeng Li,Feng Qin,Lu Li,Hong Gao,Zhiguo Zhang
Highly sensitive optical thermal sensing is achieved here based on the three-photon upconversion luminescence of Y2O3:Yb3+,Er3+ nano-thermometers. In the temperature range of 303–783 K, the 4G11/2 and 2H9/2 energy levels of Er3+ ion embedded in Y2O3 nanocrystals are found to be thermally linked. The 4G11/2–4I15/2 and 2H9/2–4I15/2 transitions’ intensity ratio thus satisfies the Boltzmann distribution. It is demonstrated that the relative sensitivity, on the basis of this ratio for temperature measurement, is as high as 2.05% K−1 at 303 K. It is, to the best of our knowledge, the maximum thermal sensitivity reported so far for the 4G11/2–4I15/2 and 2H9/2–4I15/2 transitions in various hosts. Moreover, this sensitivity is larger than all previously reported values that depend on the luminescence of the Er3+ ion. What's more, this value is also among the highest sensitivities achieved based on other thermally linked states of rare earth ions. As an added benefit, it has been shown that the single 2H9/2–4I15/2 transition can also be used for optical thermal sensing and its relative sensitivity is up to 1.27% K−1 at 783 K, which is 2.9 times the theoretical maximum sensitivity of ratiometric thermal detection based on the thermally linked states of rare earth ions.
研究领域:
材料科学
·
光学传感
·
纳米技术
·
光子学
·
稀土离子
✓ 已验证
DOI
高影响因子
RARE METALS
·
2023
·Vol. 43
·期 3
·1263-1274
·
IF 8.8
Guo Yue,Qin Lin-Jun,Xu Jing,Jiang Xiao-Ping,Yue Xiao-Yu,Hou Yi,Shi Hao,Wang Li-Xi,Zhang Qi-Tu
Optical temperature sensing based on the fluorescence intensity ratio (FIR) of red emission for lanthanide ions holds significant relevance in non-contact temperature measurement for biological application. In this study, the perovskite-structured KZnF 3 is utilized as a host material for Er 3+ to achieve a high-purity upconversion (UC) red emission. The observed Stark splitting of the red emission peak provides evidence of the energy level splitting of Er 3+ . Group theory is employed to decompose the spectral branching of Er 3+ under the point group symmetry of KZnF 3 , allowing for the derivation of Stark splitting energy levels induced by the crystal field effect. The optical temperature-sensing behavior of the red UC luminescence was investigated, specifically examining the FIR of the splitting sub-peaks, which exhibited an exponential relationship with temperature. The KZnF 3 : Yb 3+ , Er 3+ demonstrated a relative sensitivity ( S r ) of 0.00182%·K −1 at 298 K, highlighting its excellent response to temperature. Ex vivo bio-thermometry experiments conducted on chicken breast validated the material's ability to penetrate biological tissues and showed its significant sensitivity of the FIR to temperature. These results establish KZnF 3 :Yb 3+ , Er 3+ as a promising material for optical thermometry in various biological applications. Graphic abstract
研究领域:
光学传感
·
材料科学
·
发光测温学
·
生物光子学
·
固态物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Xin Liu,Ruoshan Lei,Feifei Huang,Degang Deng,Huanping Wang,Shilong Zhao,Shiqing Xu
BaMoO 4 : Er 3+ /Yb 3+ phosphors with different concentrations have been fabricated by a facile hydrothermal method . The morphology observation shows that the shape and size of BaMoO 4 powders change after Er 3+ /Yb 3+ doping. The upconversion luminescence spectra consist of intense green bands centered at 536 and 558 nm and a weak red emission band peaked at 668 nm upon 980 nm excitation. The excitation power and doping concentration have little impacts on the color emitted from the samples. Applying the fluorescence intensity ratio (FIR) technique, the temperature sensing behaviors are investigated based on thermally coupled levels ( 2 H 11/2 and 4 S 3/2 ) and non-thermally coupled levels ( 4 F 9/2 and 4 S 3/2 ), respectively. The thermometry is sensitive to the excitation power for 4 F 9/2 and 4 S 3/2 levels, leading to large measurement errors caused by the power variation. Such a problem can be solved by using the power-insensitive FIR between 2 H 11/2 and 4 S 3/2 levels, which also shows the advantage of high absolute sensitivity with the maximum of 110.7 × 10 −4 K −1 . So, the developed BaMoO 4 :Er 3+ /Yb 3+ phosphors can be applied in green light upconverters, display devices and temperature sensors .
研究领域:
材料科学
·
光学传感器
·
发光材料
·
光子学
·
稀土掺杂
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2011
·
IF 4.524
Xiaojiao Kang,Ziyong Cheng,Chunxia Li,Dongmei Yang,Mengmeng Shang,Ping’an Ma,Guogang Li,Nian Liu,Jun Lin
Core–shell structured up-conversion luminescent and mesoporous NaYF4:Yb3+/Er3+@nSiO2@mSiO2 nanospheres were prepared by coating mesoporous SiO2 layers with different thicknesses on NaYF4:Yb3+/Er3+ nanoparticles via a simple two-step sol–gel process. The obtained sample shows a typical mesoporous structure and well-dispersed spherical morphology with a narrow size distribution. The nanospheres exhibit little cytotoxicity (via MTT assay), and ibuprofen (IBU) was used as a model drug to access the release properties of the system in detail. The amount of IBU adsorbed in mesoporous channels increases with the thickness of the ordered mesoporous silica shell coated on the NaYF4:Yb3+/Er3+ nanoparticles. The in vitro release study of IBU reveals a release profile in two steps: an initial diffusion-controlled release, followed by a slower release rate. Furthermore, upon excitation by a 980 nm near-infrared laser, the nanospheres emit green (2H11/2 and 4S3/2 → 4I15/2) and red (4F9/2 → 4I15/2) fluorescence of Er3+ even after the loading of IBU. Interestingly, the emission intensity of Er3+ in the bifunctional (mesoporous and luminescence) drug carrier increases with an increase of the cumulative released amount of the model drug (IBU). Thus, the extent of drug release can be easily identified, tracked, and monitored based on the change of the up-conversion luminescence. These results suggest that the core–shell structured NaYF4:Yb3+/Er3+@nSiO2@mSiO2 nanospheres are a promising material for controlled drug release.
研究领域:
材料科学
·
生物医学工程
·
药剂学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 9
·4999-5012
·
IF 3.502
Weichao Wang,Liyan Mao,Jinlin Liu,Shanhui Xu
Er 3+ -doped fiber lasers operating at 2.7 μm have attracted increasing interest because of their various important applications; however, the intrinsic self-terminating effect of Er 3+ and the reliability of glass hosts hindered the development of Er 3+ -doped fiber lasers. Herein, the glass-forming regions of a series TeO 2 –Ga 2 O 3 –R 2 O (or MO) (R = Li, Na, and Rb; M = Mg, Sr, Ba, Pb, and Zn) glasses are predicted by the thermodynamic calculation method. On this basis, the physical and optical properties of TeO 2 –Ga 2 O 3 –ZnO (TGZ) glass are investigated in detail as an example. Under the excitation of 980 nm laser diode, the fluorescence intensity at 2.7 μm reaches a maximum in the heavily Er 3+ -doped TGZ glass. By contrast, the accompanying near-infrared fluorescence at 1.5 μm and upconversion green emissions at 528 nm and 546 nm are all effectively weaken. Furthermore, the lifetime gap between the 4 I 11/2 upper laser level and 4 I 13/2 lower laser level is sharply narrowed from 2.81 ms to 0.59 ms, which is beneficial to overcome the population conversion bottleneck. All results demonstrate that these newly developed ternary tellurite glass systems are promising candidates for near-/mid-infrared laser glass fiber, fiber amplifiers, and fiber lasers.
研究领域:
光学材料
·
光子学
·
激光物理
·
玻璃科学技术
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Shiying Tan,Xusheng Wang,Yan Zhao,Yanxia Li,Xi Yao
Rare earth doped upconversion luminescent materials have the advantages of low toxicity, high chemical stability, excellent photostability, narrow emission band, and long luminescent life, but their low fluorescence quantum efficiency restricts their practical application in the field of temperature sensing. In this paper, Er 3+ doped KYb(MoO 4 ) 2 (KYM) phosphors were synthesized by a temperature solid state reaction method. When the doped concentration is 5 mol%, the luminescence intensity get its strongest value. On this basis, 2 mol% trivalent ions Gd 3+ , La 3+ and Y 3+ (R 3+ ) were doped respectively, and the luminescence intensity increased by about 2 times. By the fluorescence intensity ratio technique, the KYM:5Er phosphor has the maximum absolute temperature sensitivity of 0.0106 K -1 . By codoping 2 mol% Gd 3+ in KYM:5Er, the upper limit of temperature measurement increased from 513 K to 663 K, which shows that Er 3+ -doped and Er 3+ /R 3+ -codoped KYM have the potential as temperature sensors .
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 12
·6319-6334
·
IF 3.784
Limin Zhao,Ruifa Jin,Baofeng Zhang
In this paper, a novel Z-scheme photocatalyst Er 3+ :Yb 0.5 Y 2.5 Al 5 N 0.01 F 0.01 O 11.98 /g-C 3 N 4 –Pt–BiPO 4 was synthesized by sol-hydrothermal and calcination methods. The prepared samples were characterized by XRD, SEM, TEM, EDS mappings, XPS, PL, and DRS. In addition, the optimal hydrothermal conditions for the preparation of BiPO 4 were explored with the azofuchsin solution and ciprofloxacin(CIP) solutions as the target pollutants. At the same time, the best calcination temperature and the best calcination time of the Er 3+ :Yb n Y 3−n Al 5 N x F y O 12−x−y and BiPO 4 were investigated. The results showed that the Z-scheme Er 3+ :Yb 0.5 Y 2.5 Al 5 N 0.01 F 0.01 O 11.98 /g-C 3 N 4 –Pt–BiPO 4 photocatalyst has strong redox ability, wide absorption range of visible light, and excellent separation effect of electron–hole pairs, which can efficiently degrade organic pollutants and antibiotic.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 35
·12189-12195
·
IF 7.059
Jun Zhou,Zhiguo Xia,Xiong Li,Xiangyan Yun,Jiayue Sun,Denghui Xu
The development of new luminescent materials with up-conversion (UC) emission falling within the first biological window (650–1000 nm) has drawn extensive attention in biological and medical fields. In this work, LiGaW2O8:Yb3+, Cr3+ UC phosphors were prepared for the first time, and the near-infrared (NIR) emission assigned to the 4T2–4A2 transition of Cr3+ was found to derive from the cooperative sensitization mechanism from Yb3+ to Cr3+. Moreover, the NIR emission of Cr3+ in the range of 700–900 nm can be greatly enhanced by the energy transfer (ET) process from Yb3+ sensitizers to Ho3+/Er3+ bridging centers and finally to Cr3+ emitting centers. Such success in LiGaW2O8:Yb3+, Ho3+/Er3+, Cr3+ provides a new perspective for designing superior UC phosphors with appropriate NIR emission, which could be used in biomedical fields.
✓ 已验证
产品关联
DOI
高影响因子
IET Nanobiotechnology
·
2020
·Vol. 14
·期 5
·347-356
·
IF 1.859
Mei Yang,Qingyuan Gui,Jinlei Ma,Lei Qi,Bijun Bao,Yida Huang
In this study, Gd 2 O 2 S:Ln 3+ (Ln 3+ = Yb 3+ , Er 3+ ) upconversion nanotubes (UCNTs) were synthesised by using Gd(OH) 3 :Ln 3+ (Ln 3+ = Yb 3+ , Er 3+ ) nanotubes as the template. The luminescent and biological properties of Gd 2 O 2 S:Ln 3+ (Ln 3+ = Yb 3+ , Er 3+ ) UCNTs, along with photodynamic therapy (PDT) applications of the Gd 2 O 2 S:8%Yb 3+ , 2%Er 3+ UCNT–Ce6 (chlorin e6) nanocomposites, were systematically studied. The resultant UCNTs showed excellent biocompatibility with human retinal pigment cells (ARPE-19) even after a prolonged incubation time of 72 h, and could be used as luminescent probes. Microscopic imaging revealed that the UCNTs existed mainly in cytoplasm. PDT studies on the Gd 2 O 2 S:8%Yb 3+ , 2%Er 3+ UCNT–Ce6 nanocomposites indicate that the growth of the tumour (cell) could be inhibited dramatically when it was injected (incubated) with Gd 2 O 2 S:8%Yb 3+ , 2%Er 3+ UCNT–Ce6 nanocomposites under the irradiation of 980 nm laser.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Jinsheng Liao,Minghua Wang,Zhuo Han,Junxiang Huang,Guoliang Gong,Junxiang Fu,He-rui Wen
A new far-red/green dual-emitting phosphor La 2 ZnTiO 6 :Mn 4+ /Er 3+ (LZT:Mn 4+ /Er 3+ ) was successfully synthesized by the sol-gel method. Under 381 nm excitation, LZT:Mn 4+ /Er 3+ phosphor shows the strong far-red emission peak of 709 nm (Mn 4+ : 2 E g → 4 A 2g ) and weak green emission peak of 523/548 nm (Er 3+ : 2 H 11/2 / 4 S 3/2 → 4 I 15/2 ), which consistent with the requirement of plant growth for far-red and green light. A 1.5-fold enhancement of far-red emission intensity is found in LZT:Mn 4+ /Er 3+ phosphor compared with the Mn 4+ singly-doped counterparts. Moreover, the relative emission intensity of far-red and green can be easily controlled by changing temperature. Utilizing the optimal LZT:0.2%Mn 4+ /2%Er 3+ phosphor as plant lighting, a prototype near-UV-pumped LED device was fabricated. Upon 120 mA driving current, it demonstrated far-red/green dual emission. All the results indicated that the LZT:Mn 4+ /Er 3+ phosphor is a potential material for plant growth illumination with far-red/green light.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 13
·7189-7195
·
IF 3.049
Weiguang Ran,Hyeon Mi Noh,Sung Heum Park,Bo Ram Lee,Jung Hwan Kim,Jung Hyun Jeong,Jinsheng Shi,Guangzeng Liu
Realization of simultaneous, efficient bifunctional application of thermochromic phosphors on light emitting diodes (LEDs) and as ratiometric thermometers is significant. Herein, doped Er3+ ions are introduced as an activator into double perovskite LiLaMgWO6 host lattice. The developed phosphors can be efficiently excited by a near-ultraviolet LED chip and show bright green emission, mainly at 527 and 543 nm, as well as very low thermal quenching. Their chemical stability is studied, demonstrating excellent application potentials. Furthermore, the temperature sensing properties of LiLaMgWO6:0.01Er3+ were analyzed in the wide range of 303–483 K and show a good exponential relationship between ratiometric intensity and temperature (R2 > 0.999), as well as high sensitivity (2.24% K−1). Such a system not only optimizes the performance in solid light emitting but also provides an excellent platform for designing high-sensitivity optical thermometry.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）