scholarly journals Florescence Intensity Ratio Thermometer in the First Biological Window Based on Non-Thermally Coupled Energy Levels of Tm3+ and Ho3+ Ions

2021 ◽  
Vol 8 ◽  
Author(s):  
Liang Li ◽  
Haoyue Hao
Keyword(s):  
Near Infrared ◽  
Energy Levels ◽  
Temperature Sensing ◽  
Infrared Light ◽  
Light Region ◽  
Potential Applications ◽  
Intensity Ratios ◽  
Sensing Sensitivity ◽  
Co Doped ◽  
Fluorescence Peak

In this study, the up-conversion luminescence and optical temperature sensing properties of Ho3+/Tm3+/Yb3+-co-doped NaLuF4 phosphors were investigated. The visible (475, 540, and 650 nm) and near-infrared light (692 and 800 nm) radiated from 1Ho3+/4Tm3+/Yb3+-co-doped NaLuF4 phosphors were obvious enough for subsequent detection. The slopes in the lnI–lnP plot of the emissions located in the first biological window (650, 692, and 800 nm) were both ∼1.5, which mean that the power had little effect on the three fluorescence peak ratios. Based on the florescence intensity ratios (FIRs) of 650 and 692 nm, the relative sensing sensitivity reaches 0.029 K−1 (476 K). The relative sensing sensitivity based on the FIRs of 800 and 692 nm reaches 0.0076 K−1 (476 K). The results reveal that 1Ho3+/4Tm3+/Yb3+-co-doped NaLuF4 phosphors have potential applications in FIR-based temperature sensing in biological tissue for their high sensing sensitivity. In addition, the emission colors of the sample stabilize in the white light region as the temperature increased from 303 to 467 K, implying that it can also be used in white display.

scholarly journals Bi3+ Effects on Down-/up-conversion Luminescence, Temperature Sensing and Optical Transition Properties in Bi3+/Er3+ Co-doped YNbO4  Phosphors

2020 ◽  
Author(s):  
Xin Wang ◽  
Xiangping Li ◽  
Hongquan Yu ◽  
Sai Xu ◽  
Jiashi Sun ◽  
...  
Keyword(s):  
Near Infrared ◽  
Optical Transition ◽  
Green Emission ◽  
Radiative Transition ◽  
Solid State Reaction Method ◽  
Temperature Sensing ◽  
Infrared Light ◽  
Luminescence Spectra ◽  
Experimental Values ◽  
Co Doped

Abstract A series of Bi3+ single-doped and Bi3+/Er3+ co-doped YNbO4 phosphors with various concentrations of Bi3+ ions were prepared by a conventional high temperature solid-state reaction method. The results of XRD and Rietveld refinement confirmed that monoclinic phase YNbO4 samples were achieved. The down-/up-conversion luminescence of Er3+ ions were investigated under the excitation of ultraviolet light (327 nm) and near infrared light (980 nm). Under 327 nm excitation, broad visible emission band from Bi3+ ions and characteristic green emission peaks from Er3+ ions were simultaneously observed, while only strong green emissions from Er3+ ions were detected upon excitation of 980 nm. Remarkable emission enhancement was observed in down-/up-conversion luminescence processes by introducing Bi3+ ions into Er3+-doped YNbO4 phosphors. By analyzing the laser working current dependent up-conversion luminescence spectra, two-photon processes were confirmed to be responsible for both the green and the red up-conversion emissions of Er3+ ion. The temperature sensing property of Er3+ was studied by using the temperature dependent up-conversion luminescence spectra and it was found that the temperature sensitivity was sensitive to the doping concentration of Bi3+ ions. By comparing the experimental values of the radiative transition rate ratio of the two green emission levels of Er3+ ions and the theoretical values calculated by Judd-Ofelt (J-O) theory, it was concluded that energy level splitting had significant influences on the temperature sensing property of Er3+ ions.

Near-infrared Light-mediated Er3+ and Yb3+ co-doped CaTi4O9 for Optical Temperature Sensing Behavior

2020 ◽  
pp. 117737
Author(s):  
Prashansha Singh ◽  
Neha Jain ◽  
Anish Kumar Tiwari ◽  
Shraddha Shukla ◽  
Vikas Baranwal ◽  
...  
Keyword(s):  
Near Infrared ◽  
Temperature Sensing ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Co Doped

scholarly journals Up-Converting Luminescence and Temperature Sensing of Er3+/Tm3+/Yb3+ Co-Doped NaYF4 Phosphors Operating in Visible and the First Biological Window Range

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2660
Author(s):  
Jingyun Li ◽  
Yuxiao Wang ◽  
Xueru Zhang ◽  
Liang Li ◽  
Haoyue Hao
Keyword(s):  
Energy Level ◽  
Luminescence Intensity ◽  
Industrial Production ◽  
Intensity Ratio ◽  
Temperature Sensors ◽  
Temperature Sensing ◽  
Optical Thermometry ◽  
Potential Applications ◽  
Sensing Sensitivity ◽  
Co Doped

Accurate and reliable non-contact temperature sensors are imperative for industrial production and scientific research. Here, Er3+/Tm3+/Yb3+ co-doped NaYF4 phosphors were studied as an optical thermometry material. The typical hydrothermal method was used to synthesize hexagonal Er3+/Tm3+/Yb3+ co-doped NaYF4 phosphors and the morphology was approximately rod-like. The up-conversion emissions of the samples were located at 475, 520, 550, 650, 692 and 800 nm. Thermo-responsive emissions from the samples were monitored to evaluate the relative sensing sensitivity. The thermal coupled energy level- and non-thermal coupled energy level-based luminescence intensity ratio thermometry of the sample demonstrated that these two methods can be used to test temperature. Two green emissions (520 and 550 nm), radiated from 2H11/2/4S3/2 levels, were monitored, and the maximum relative sensing sensitivities reached to 0.013 K−1 at 297 K. The emissions located in the first biological window (650, 692 and 800 nm) were monitored and the maximum relative sensing sensitivities reached to 0.027 (R692/650) and 0.028 K−1 (R692/800) at 297 K, respectively. These results indicate that Er3+/Tm3+/Yb3+ co-doped NaYF4 phosphors have potential applications for temperature determination in the visible and the first biological window ranges.

Single red emission from upconverting ZnGa2O4:Yb,Er nanoparticles co-doped by Cr3+

2020 ◽  
Vol 8 (19) ◽  
pp. 6370-6379 ◽  
Author(s):  
Bhupendra B. Srivastava ◽  
Santosh K. Gupta ◽  
Yuanbing Mao
Keyword(s):  
Hydrothermal Method ◽  
Near Infrared ◽  
Red Light ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Red Emission ◽  
Co Doped

ZnGa2O4:Yb3+,Er3+,Cr3+ nanoparticles synthesized by a hydrothermal method and further annealing emit bright singular red light under 980 nm excitation and near-infrared light under 254 nm excitation.

Responsive polymer–fluorescent carbon nanoparticle hybrid nanogels for optical temperature sensing, near-infrared light-responsive drug release, and tumor cell imaging

Nanoscale ◽  
2014 ◽  
Vol 6 (13) ◽  
pp. 7443-7452 ◽  
Author(s):  
Hui Wang ◽  
Fuyou Ke ◽  
Anton Mararenko ◽  
Zengyan Wei ◽  
Probal Banerjee ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Tumor Cell ◽  
Near Infrared ◽  
Cell Imaging ◽  
Temperature Sensing ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Carbon Nanoparticle ◽  
Responsive Polymer

The paper demonstrates the synthesis of carbon-based responsive hybrid nanogels and their applications including sensing, cell imaging and drug delivery.

Structure and Up-Conversion Luminescence of Er3+/Yb3+ Co-Doped Lanthanum Zirconate Ceramics

2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940081
Author(s):  
E. Trusova ◽  
R. Klement ◽  
Y. Tratsiak ◽  
L’. Bača ◽  
P. Veteška ◽  
...  
Keyword(s):  
Near Infrared ◽  
Laser Excitation ◽  
Laser Diodes ◽  
Luminescent Properties ◽  
Lanthanum Zirconate ◽  
Display Devices ◽  
Annealing Conditions ◽  
Potential Applications ◽  
Infrared Excitation ◽  
Co Doped

La2Zr2O7:Er, Yb nanoceramics have been obtained. Its structural and up-conversion luminescent properties were investigated. Under 980 nm laser excitation, the ceramics produced intense green and red up-conversion emission. The influence of Er3+ concentration and annealing conditions on the emission intensities has been discussed. The fabricated ceramics are expected to be an efficient up-conversion material with potential applications for laser diodes, display devices, detectors where the near infrared excitation is required.

Two-step synthetic route towards Er3+/Yb3+ co-doped vernier yttrium oxyfluoride phosphor with high optical temperature sensing sensitivity

2021 ◽  
Vol 122 ◽  
pp. 111668
Author(s):  
Xiangyi Li ◽  
Guangdong Wu ◽  
Hao Bai ◽  
Mengjiao Sheng ◽  
Zhihua Leng ◽  
...  
Keyword(s):  
Temperature Sensing ◽  
Synthetic Route ◽  
Yttrium Oxyfluoride ◽  
Sensing Sensitivity ◽  
Co Doped

In Vivo Near Infrared Techniques for Protein Drug Development

2008 ◽  
pp. 1365-1373
Author(s):  
Yueqing Gu ◽  
Zhiyu Qian ◽  
Huimin Qian ◽  
Chunsheng Fang ◽  
Yulin Song
Keyword(s):  
Health Care ◽  
Near Infrared ◽  
Drug Carrier ◽  
Rapid Development ◽  
Infrared Light ◽  
Nir Light ◽  
Potential Applications ◽  
Living Tissues ◽  
Almost All

Near infrared (NIR) light (700 ~ 900 nm) possesses the capability of penetrating living tissues several centimeters due to the low absorbance of tissue intrinsic chromophores such as oxy- and deoxy-hemoglobin (the main absorber of visible light), melanin, water, and lipid (the principal absorber of infrared light). Featured with the deeper tissue penetration as well as nonionizing and nonradioactive, NIR light attracts extensive attentions on the development of noninvasive techniques for in vivo real time monitoring/tracing of biological signals in living tissues. Hitherto, NIR techniques have permeated to almost all aspects of health care, such as diagnosing disease (Nahum, Skippen, Gagnon, Macnab, & Skarsgard, 2006), designing the targeted molecular or drug carrier (Hsu et al., 2006), monitoring the response to therapeutic treatment (Tachtsidis et al., 2007), evaluating the rehabilitation, and so on. With the rapid development of various NIR techniques and more cooperation with clinic studies, more potential applications in health care will be exploited in the near future.

Sign in / Sign up

Export Citation Format

Share Document