1,572 research outputs found
Comparative thermometric properties of bi-functional Er<sup>3+</sup>–Yb<sup>3+</sup> doped rare earth (RE = Y, Gd and La) molybdates
No full textEnhancing the upconversion luminescence properties of Er 3+ –Yb 3+ doped yttrium molybdate through Mg 2+ incorporation: effect of laser excitation power on temperature sensing and heat generation
No full textSynthesis and Upconversion Emission Properties of Green Emitting Y<SUB>4</SUB>MoO<SUB>9</SUB>: Er<SUP>3</SUP><SUP>+</SUP>/Yb<SUP>3</SUP><SUP>+</SUP> Phosphor
No full textUp/down-converted green luminescence of Er3+-Yb3+ doped paramagnetic gadolinium molybdate: a highly sensitive thermographic phosphor for multifunctional applications
No full textA series of Er3+-Yb3+ doped gadolinium molybdate phosphors were synthesized via hydrothermal method with varying Er3+ and Yb3+ concentrations and their thermal stability, crystal phase formation, particle morphology and photoluminescence properties were explored. The effects of rare earth doping concentration and annealing temperature on upconversion and downconversion properties have been investigated upon 980 nm and 380 nm light excitation and explained with the variation in lifetime of the S-4(3/2) level of Er3+. The materials were further investigated to look into the effect of Er3+-concentration on optical temperature sensing and nano-heating behavior. Temperature sensing measurements were performed by the fluorescence intensity ratio technique using the transitions from the two thermally coupled energy levels (H-2(11/2)/S-4(3/2) -> I-4(15/2)) of Er3+. The maximum temperature sensitivity was obtained as 0.0105 K-1 (at 450 K), which is among the highest measured sensitivities for luminescence based thermometers. Moreover, the material shows very high thermal gain due to laser irradiation, resulting in a temperature rise from 364 K to 683 K as the excitation power changes from 7.0 to 65 W cm(-2) and defines the present material as a highly sensitive thermographic phosphor. Additionally, the paramagnetic nature and effect of the magnetic field on upconversion properties of this phosphor have also been explored. The thermally-stable, paramagnetic Gd2Mo3O9:Er3+/Yb3+ phosphor particles seem to be potential candidates for displays, remote temperature sensing, optical heaters, magneto-optic modulators and bio-imaging applications
Er3+-Yb3+ doped vanadate nanocrystals: A highly sensitive thermographic phosphor and its optical nanoheater behavior
No full textOptical temperature sensors play a vital role in biomedical and therapeutic applications due to their reliable and unique detection sensitivity. Internal self-heating in Er3+/Yb3+ doped yttrium vanadate particles is observed on optical excitation at 980 nm wavelength of a diode laser. Temperature sensing performance is investigated by exploiting the temperature dependent fluorescence intensity ratio (FIR) of two emission bands (H-2(11/2)/S-4(3/2)-> I-4(15/2)) of Er3+ ion. The calculated sensor sensitivity, 0.01169 K-1 at 380 K, is found the highest among the reported results for inorganic nanosensors. The temperature of the nanocrystalline sample particles is found to increase by a large value (315-460 K) within a short interval of excitation pump power (13.18-50.45W cm(-2)). This achievement suggests potential use of the present material as an optical nanoheater for hyper-thermal treatment. (C) 2014 Elsevier B.V. All rights reserved
sj-png-1-urj-10.1177_03915603241249227 – Supplemental material for Assessing safety and feasibility of monopolar transurethral resection of the prostate without post-operative catheter traction: A randomized controlled trial
No full textSupplemental material, sj-png-1-urj-10.1177_03915603241249227 for Assessing safety and feasibility of monopolar transurethral resection of the prostate without post-operative catheter traction: A randomized controlled trial by Abhineeth KP, Kumar Madhavan, Devashish Kaushal, Manoj Biswas, Sonu Kumar Plash and Viswas MR in Urologia Journal</p
Enhancement of upconversion, temperature sensing and cathodoluminescence in the K<sup>+</sup>/Na<sup>+</sup> compensated CaMoO<sub>4</sub>:Er<sup>3+</sup>/Yb<sup>3+</sup> nanophosphor
No full textEnhancing upconversion, temperature sensing and cathodoluminescence in the CaMoO4:Er3+/Yb3+ nanophosphor via K+/Na+ simultaneous codoping.</p
YVO4:Er3+/Yb3+ phosphor for multifunctional applications
No full textThis article reports luminescence studies on wet-chemical route prepared YVO4:Er3+/Yb3+ microdisc phosphor. The 980 nm laser excited upconversion (UC) emission intensity ratio of green to red bands is found too high to neglect the contribution from the red emission band, which is not observed normally in Er3+/Yb3+-doped materials. The red emission is also found absent in the downconversion emission under excitation at 316 nm. The variation of UC intensities with external temperature exhibits a well-fashioned pattern, which suggests that the H-2(11/2) and S-4(3/2) levels of Er3+ ion are thermally coupled. The YVO4:Er3+/Yb3+ phosphor has shown outstanding temperature-sensing behavior with maximum sensitivity of 0.0117 K-1 at 400 K. This material is also employed to develop a latent fingerprint in green color. Furthermore, the present phosphor could be useful for solar cell concentrators, drug delivery, and disease therapy applications. (C) 2014 Optical Society of Americ
Supplemental Material, sj-docx-1-ptd-10.1177_08968608221096562 - Compatibility and stability of non-ionic iodinated contrast media in peritoneal dialysis solution and safe practice considerations for CT peritoneography
No full textSupplemental Material, sj-docx-1-ptd-10.1177_08968608221096562 for Compatibility and stability of non-ionic iodinated contrast media in peritoneal dialysis solution and safe practice considerations for CT peritoneography by Jayan Rappai, John H Crabtree, Ann Mancini, Sudheer Kumar Badugu, Anuj Kaushal and Mary E Gellens in Peritoneal Dialysis International</p
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