Journal ArticleDOI
Er3+-doped BaTiO3 nanocrystals for thermometry: Influence of nanoenvironment on the sensitivity of a fluorescence based temperature sensor
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TLDR
In this paper, the authors measured the fluorescence intensity ratio (FIR) of two thermodynamically coupled excited states of Er3+ doped in BaTiO3 nanocrystals using a diode laser emitting at 980 nm as the excitation source.Abstract:
Frequency upconverted emissions centered at 526 and 547 nm from two thermodynamically coupled excited states of Er3+ doped in BaTiO3 nanocrystals were recorded in the temperature range from 322 to 466 K using a diode laser emitting at 980 nm as the excitation source. The ensemble measurements of the fluorescence intensity ratio (FIR) of the signals at 526 and 547 nm as a function of the temperature showed that the sensitivity (the rate in which the FIR changes with the temperature) of such sensor depends on the size of the nanocrystal. This is explained taking into consideration modifications of nonraditive relaxation mechanisms with the size of the nanocrystals.read more
Citations
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Temperature sensing using fluorescent nanothermometers
Fiorenzo Vetrone,Rafik Naccache,Alicia Zamarrón,Ángeles Juarranz de la Fuente,Francisco Sanz-Rodríguez,Laura Martínez Maestro,Emma Martín Rodríguez,Daniel Jaque,José García Solé,John A. Capobianco +9 more
TL;DR: A novel nanothermometer, capable of accurately determining the temperature of solutions as well as biological systems such as HeLa cancer cells, is devised based on the temperature-sensitive fluorescence of NaYF(4):Er(3+),Yb(3+) nanoparticles.
Journal ArticleDOI
Thermometry at the nanoscale
Carlos D. S. Brites,Patrícia P. Lima,Nuno Silva,Ángel Millán,Vitor S. Amaral,Fernando Palacio,Luís D. Carlos +6 more
TL;DR: A general overview of recent examples of luminescent and non-luminescent thermometers working at nanometric scale and the challenges and opportunities in the development for highly sensitive ratiometric thermometers operating at the physiological temperature range with submicron spatial resolution is offered.
Journal ArticleDOI
Temperature Sensing and In Vivo Imaging by Molybdenum Sensitized Visible Upconversion Luminescence of Rare‐Earth Oxides
TL;DR: A novel high excited state energy transfer pathway to overcome the phonon quenching effect in rare-earth (RE) oxide upconversion materials is reported.
Journal ArticleDOI
Optical temperature sensing of rare-earth ion doped phosphors
TL;DR: In this paper, the current status of optical thermometry of rare-earth ion doped phosphors is reviewed in detail, based on the mechanisms of optical temperature sensing of different phosphors, temperature dependent luminescence spectra, the fluorescence intensity ratio technique in the data fitting process, and errors of the energy difference between thermally coupled levels.
References
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Journal ArticleDOI
Fluorescence intensity ratio technique for optical fiber point temperature sensing
TL;DR: In this paper, the temperature dependence of the fluorescence intensity ratio has been studied using thermally coupled energy levels in seven different rare earth ions doped into a variety of glasses and crystals.
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Near-infrared Emission of Redispersible Er3+, Nd3+, and Ho3+ Doped LaF3 Nanoparticles
TL;DR: The lifetime of Eu3+ at a doping concentration of 5% were 7.7 ± 0.2 ms, indicative of very high quantum yields as mentioned in this paper, and the probability of nonradiative decay for ions at or near the surface and ions in the core of the particles.
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Optical transitions of Er 3 + ions in fluorozirconate glass
TL;DR: In this paper, the Huang-Rhys theory of multiphonon emission was used to calculate the radiative and non-radiative rates for five luminescing states in fluorozirconate glass.
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Dependence of fluorescence lifetimes of Y2O3 : Eu3+ nanoparticles on the surrounding medium
TL;DR: In this paper, the authors measured the radiative lifetime of nanocrystals surrounded with air as well as those immersed in different liquids and provided a unique test of the standard formula relating to the radii and the oscillator strength.
Journal ArticleDOI
Red, green, and blue upconversion luminescence of trivalent-rare-earth ion-doped Y2O3 nanocrystals
Abstract: Trivalent-rare-earth ion-doped Y2O3 nanocrystals have been synthesized, and their photoluminescence properties have been studied under 980 nm laser diode excitation. The crystallite size estimated by x-ray diffractometry and scanning electron microscopy was about 30–40 nm. In Yb3+ and Tm3+ codoped Y2O3 nanocrystals, the bright blue emissions near 450 and 480 nm have been noticeable due to the 1D2–3F4 and 1G4–3H6 transitions of Tm3+, respectively. The bright green emissions of Er3+ doped Y2O3 nanocrystals appeared near 530 and 550 nm were assigned to the 2H11/2–4I15/2 and 4S3/2–4I15/2 transitions of Er3+, respectively. The ratio of the intensity of green luminescence to that of red luminescence has decreased with an increase of concentration of Yb3+ in Er3+ doped Y2O3 nanocrystals. In sufficient quantities of Yb3+ to Er3+, the bright red emission near 660 nm has been predominant due to the 4F9/2–4I15/2 transition of Er3+. The primary color components are in these red, green, and blue emissions, from which ...