Results 231 to 240 of about 19,577 (268)

Photon Upconversion in Aqueous Nanodroplets

Journal of the American Chemical Society, 2019
Triplet fusion upconversion, the conversion of two low-energy photons into one higher-energy photon via excitonic intermediates, has the potential to revolutionize fields as diverse as biological imaging, photovoltaics, and optogenetics. However, important hurdles to widespread application still exist; for example, the vast majority of demonstrations ...
Samuel N. Sanders, Mahesh K. Gangishetty, Matthew Y. Sfeir, Daniel N. Congreve   +3 more
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Luminescence Tuning of Upconversion Nanocrystals

Chemistry – A European Journal, 2010
AbstractUpconversion luminescence tuning of β‐NaYF4 nanorods under 980 nm excitation has successfully been achieved by tridoping with Ln3+ ions with different electronic structures. The effects of Ce3+ ions on NaYF4:Yb3+/Ho3+ as well as Gd3+ ions on NaYF4:Yb3+/Tm3+(Er3+) have been studied in detail.
Guofeng, Wang, Qing, Peng, Yadong, Li
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Upconversion dynamics of Er3+:YAlO3

Journal of Applied Physics, 1993
The dynamics of the green (2H11/12, 4S3/2) and red (4F9/2) upconversion emission excited by 15 ns pulses from an Er:fibre laser at 1500 nm are presented and analyzed. The upconversion process is found to fit a kinetic model, which includes both cross relaxation and energy transfer.  
Simkin, D.J., Koningstein, J.A., Myslinski, P., Boothroyd, S.A., Chrostowski, J.   +4 more
openaire   +2 more sources

The biosafety of lanthanide upconversion nanomaterials

Chemical Society Reviews, 2015
The association between the chemo-physical properties of UCNPs and their biodistribution, excretion, and toxic effects is presented in this review.
Yun, Sun, Wei, Feng, Pengyuan, Yang, Chunhui, Huang, Fuyou, Li   +4 more
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Plasmon enhancement of luminescence upconversion

Chemical Society Reviews, 2015
This review is aimed at offering a comprehensive framework for plasmon enhanced luminescence upconversion.
Wounjhang, Park, Dawei, Lu, Sungmo, Ahn
openaire   +2 more sources

Upconversion photoluminescence analysis of fluoroquinolones

Analytical and Bioanalytical Chemistry, 2019
The characteristics of the upconversion (UC) photoluminescence (PL) of fluoroquinolones (FQs) are reported here for the first time. Using UC PL, a simple, sensitive, and cost-effective method of determining FQs was developed that eliminated interference arising from biological background fluorescence and did not require UV light to excite the FQ (in ...
Qiuju, Zhou, Xiaoyan, Deng, Yajun, Fang, Kejun, Tan   +3 more
openaire   +2 more sources

Upconversion multichannel infrared spectrometer

Optics Letters, 2005
A multichannel IR spectrometer using a standard silicon CCD array is demonstrated. Sum frequency generation between an ultrafast optical pulse and a frequency-dispersed IR beam generates a spatially extended optical signal that is collected on a generic CCD video camera.
Matthew F, DeCamp, Andrei, Tokmakoff
openaire   +2 more sources

Entropically Driven Photochemical Upconversion

The Journal of Physical Chemistry A, 2011
Conventional photochemical upconversion (UC) through homo-geneous triplet-triplet annihilation (TTA) is subject to several enthalpic losses that limit the UC margin. Here, we address one of these losses: the triplet energy transfer (TET) from the sensitizer to the emitter molecules.
Yuen Yap, Cheng, Burkhard, Fückel, Tony, Khoury, Raphaël G C R, Clady, N J, Ekins-Daukes, Maxwell J, Crossley, Timothy W, Schmidt   +6 more
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Experimental Studies of Upconversion Laser Materials and Upconversion Lasers

1992
Results will be presented of our spectrocopic measurements on Er:YLi:F4 and Er:BaY2F8. These materials have now been employed to make red, green and blue lasers that are pumped in the infrared. An output power 0.5 W has been measured at 551 nm with a 14% slope efficiency.
openaire   +1 more source

Upconversion

2022
T.W. Schmidt, M.J.Y. Tayebjee, J. Alves
openaire   +1 more source