Strategy for optical thermometry based on temperature-dependent charge transfer to the Eu3+ 4f-4f excitation intensity ratio in Sr3Lu(VO4)3:Eu3+ and CaWO4:Nd3+

2020 ◽  
Vol 45 (13) ◽  
pp. 3637
Author(s):  
Qianyang Chang ◽  
Xianju Zhou ◽  
Xiao Zhou ◽  
Lingni Chen ◽  
Guotao Xiang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Intensity Ratio ◽  
Excitation Intensity ◽  
Temperature Dependent ◽  
Optical Thermometry

Optical thermometry based on anomalous temperature-dependent 1.53 μm infrared luminescence of Er3+ in BaMoO4: Er3+/Yb3+ phosphor

2018 ◽  
Vol 86 ◽  
pp. 278-285 ◽  
Author(s):  
Ruoshan Lei ◽  
Xin Liu ◽  
Feifei Huang ◽  
Degang Deng ◽  
Shilong Zhao ◽  
...  
Keyword(s):  
Temperature Dependent ◽  
Anomalous Temperature ◽  
Infrared Luminescence ◽  
Optical Thermometry

An optical thermometry based on abnormal negative thermal quenching of the charge transfer band edge

2019 ◽  
Vol 215 ◽  
pp. 116636
Author(s):  
Dingling Duan ◽  
Yongjie Wang ◽  
Sha Jiang ◽  
Li Li ◽  
Guotao Xiang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Band ◽  
Thermal Quenching ◽  
Band Edge ◽  
Optical Thermometry

Temperature-Dependent Approach to Electronic Charge Transfer

2020 ◽  
Vol 124 (26) ◽  
pp. 5465-5473
Author(s):  
Marco Franco-Pérez ◽  
José L. Gázquez ◽  
Paul W. Ayers ◽  
Alberto Vela
Keyword(s):  
Charge Transfer ◽  
Electronic Charge ◽  
Temperature Dependent ◽  
Electronic Charge Transfer

Temperature dependent luminescence of Dy3+ doped BaYF5 nanoparticles for optical thermometry

2014 ◽  
Vol 14 (8) ◽  
pp. 1067-1071 ◽  
Author(s):  
Zhongmin Cao ◽  
Shaoshuai Zhou ◽  
Guicheng Jiang ◽  
Yonghu Chen ◽  
Changkui Duan ◽  
...  
Keyword(s):  
Temperature Dependent ◽  
Optical Thermometry

Laser Power and Temperature Dependent Photoluminescence Characteristics of Annealed GaInNAs/GaAs Quantum Well

2003 ◽  
Vol 799 ◽  
Author(s):  
Ng Tien Khee ◽  
Yoon Soon Fatt ◽  
Fan Weijun
Keyword(s):  
Activation Energy ◽  
Low Temperature ◽  
Quantum Well ◽  
Laser Power ◽  
Laser Excitation ◽  
Excitation Intensity ◽  
Temperature Curve ◽  
Temperature Dependent ◽  
Localization Center ◽  
Temperature Dependent Photoluminescence

ABSTRACTPhotoluminescence (PL) of annealed GaInNAs quantum well (QW) with varying temperature and laser excitation intensity is measured to understand the low temperature PL properties of annealed 6 nm GaInNAs QW. The measurements show that localization effect still exist in the QW even after annealing. This effect is characterized by an activation energy of 11 meV below the e1 state, which is obtained from fitting the integrated PL intensity vs. temperature curve with a single-activation-energy (SAE) model. This center is suggested to be related to the main localization center below the e1 state that could be resulted by N or In compositional fluctuation even after annealing.

Electrical Properties of CuTCNQ Based Organic Memories Targeting Integration in the CMOS Back End-of-Line

2007 ◽  
Vol 997 ◽  
Author(s):  
Robert Mueller ◽  
Joris Billen ◽  
Rik Naulaerts ◽  
Olivier Rouault ◽  
Ludovic Goux ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Thermogravimetric Analysis ◽  
Electrical Properties ◽  
Room Temperature ◽  
Charge Transfer Complex ◽  
Temperature Dependent ◽  
Electrical Switching ◽  
Nonvolatile Memories ◽  
Threshold Voltages ◽  
Organic Memories

AbstractCuTCNQ (TCNQ=7,7,8,8-tetracyanoquinodimethane) is a resistive switching charge-transfer complex which can be used for organic nonvolatile memories. In this contribution we report on a thorough investigation of the electrical switching of CuTCNQ memories. Our memories currently achieve an endurance of up to 10000 write/erase cycles with a clear distinction between ON and OFF reading currents. ON and OFF threshold voltages follow a Gaussian distribution. Temperature dependent measurements of CuTCNQ based organic memories show a semiconductor like behavior for the ON state. The retention time of the ON state exceeded 60 hours at room temperature. Electrical switching of CuTCNQ memories in air was virtually not affected by temperatures up to 80°C, but becomes erratic at 120°C. The CuTCNQ material itself already starts to decompose around 200°C in presence of oxygen as shown by thermogravimetric analysis.

scholarly journals Ratiometric optical thermometry based on temperature-induced shift of V-O charge transfer band edge

2020 ◽  
Vol 28 (10) ◽  
pp. 14396
Author(s):  
Shaoshuai Zhou ◽  
Xiaoman Li ◽  
Shoubao Zhang ◽  
Hongyan Zhao
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Band ◽  
Band Edge ◽  
Optical Thermometry

scholarly journals A new generation of dual-mode optical thermometry based on ZrO2:Eu3+ nanocrystals

Nanophotonics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 2347-2358 ◽  
Author(s):  
Jun Zhou ◽  
Ruoshan Lei ◽  
Huanping Wang ◽  
Youjie Hua ◽  
Denghao Li ◽  
...  
Keyword(s):  
High Performance ◽  
Temperature Sensitive ◽  
Nonradiative Relaxation ◽  
Temperature Dependent ◽  
Dual Mode ◽  
Optical Thermometry ◽  
New Type ◽  
Optical Thermometer ◽  
New Generation ◽  
Sensing Sensitivity

AbstractFor achieving well-performing optical thermometry, a new type of dual-mode optical thermometer is explored based on the valley-to-peak ratio (VPR) and fluorescence lifetime of Eu3+ emissions in the ZrO2:Eu3+ nanocrystals with sizes down to 10 nm. In the VPR strategy, the intensity ratio between the valley (600 nm) generated by the emission band overlap and the 606 nm peak (5D0→7F2), which is highly temperature sensitive, is employed, giving the maximum relative sensing sensitivity (Sr) of 1.8% K−1 at 293 K and good anti-interference performance. Meanwhile, the 606 nm emission exhibits a temperature-dependent decay lifetime with the highest Sr of 0.33% K−1 at 573 K, which is due to the promoted nonradiative relaxation with temperature. These results provide useful information for constructing high-performance dual-mode optical thermometers, which may further stimulate the development of photosensitive nanomaterials for frontier applications.

Luminescent molecular thermometers for the ratiometric sensing of intracellular temperature

2017 ◽  
Vol 36 (1) ◽  
Author(s):  
Seiichi Uchiyama ◽  
Chie Gota
Keyword(s):  
Gene Expression ◽  
Cell Division ◽  
Emission Intensity ◽  
Intensity Ratio ◽  
Enzyme Reaction ◽  
Living Cells ◽  
Review Article ◽  
Temperature Dependent ◽  
Molecular Thermometers ◽  
Emission Intensity Ratio

AbstractRecently, numerous luminescent molecular thermometers that exhibit temperature-dependent emission properties have been developed to measure the temperatures of tiny spaces. Intracellular temperature is the most interesting and exciting applications of luminescent molecular thermometers because this temperature is assumed to be correlated with all cell events, such as cell division, gene expression, enzyme reaction, metabolism, and pathogenesis. Among the various types of temperature-dependent emission parameters of luminescent molecular thermometers, the emission intensity ratio at two different wavelengths is suitable for accurate and accessible intracellular temperature measurements. In this review article, luminescent molecular thermometers that exhibit a temperature-dependent emission intensity ratio in living cells are summarized, and current progress in intracellular thermometry is outlined.

scholarly journals Effect of Temperature on Luminescence of LiNbO3 Crystals Single-Doped with Sm3+, Tb3+, or Dy3+ Ions

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1034
Author(s):  
Radosław Lisiecki ◽  
Bogusław Macalik ◽  
Robert Kowalski ◽  
Jarosław Komar ◽  
Witold Ryba-Romanowski
Keyword(s):  
Charge Transfer ◽  
Optical Pumping ◽  
Czochralski Method ◽  
Rare Earth Ions ◽  
Effect Of Temperature ◽  
Luminescence Spectra ◽  
Temperature Dependent ◽  
Steep Decrease ◽  
Different Temperatures ◽  
Ct Transitions

Crystals of LiNbO3 single-doped with Sm3+, Tb3+, or Dy3+ and crystal of LiTaO3 single-doped with Tb3+ were grown by the Czochralski method. Luminescence spectra and decay curves for LiNbO3 samples containing Sm3+ or Dy3+ ions were recorded at different temperatures between 295 and 775 K, whereas those for samples containing Tb3+ ions were recorded at different temperatures between 10 and 300 K. Optical absorption spectra at different temperatures were recorded within the UV-blue region relevant to optical pumping of the samples. It was found that the effect of temperature on experimental luminescence lifetimes consists of the initial temperature-independent stage followed by a steep decrease with the onset at about 700, 600, and 150 K for Sm3+, Dy3+, and Tb3+ ions, respectively. Additionally, comparison of temperature impact on luminescence properties of LiNbO3:Tb3+ and LiTaO3:Tb3+ crystals has been adequately described. Experimental results were interpreted in terms of temperature-dependent charge transfer (CT) transitions within the modified Temperature—Dependent Charge Transfer phenomenological model (TDCT). Disparity of the onset temperatures and their sequence were explained based on the location of familiar zigzag curves connecting the ground state levels of rare earth ions with respect to the band-gap of the host. It was concluded also that LiNbO3:Sm3+ is suitable as an optical sensor within the 500–750 K temperature region whereas LiNbO3:Dy3+ offers the highest sensitivity at lower temperatures between 300 and 400 K.

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