Change in the emission saturation and kinetics of upconversion nanoparticles under different light irradiations

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Bagheri, NiushaKTH,Kvant- och biofotonik,Photonics Laboratory, Physics Department, Kharazmi University, Tehran, Iran (författare)

QC 20191205
Nd3+-sensitized upconversion nanoparticles (UCNPs) can be excited by both 980 and 808 nm light, which is regarded as a particularly advantageous property of these particles. In this work, we demonstrate that the nanoparticles can exhibit significantly different response when excited at these two excitation wavelengths, showing dependence on the intensity of the excitation light and the way it is distributed in time. Specifically, with 808 nm excitation saturation in the emitted luminescence is more readily reached with increasing excitation intensities than upon 980 nm excitation. This is accompanied by delayed upconversion luminescence (UCL) kinetics and weaker UCL intensities. The different luminescence response at 808 and 980 nm excitation reported in this work is relevant in a manifold of applications using UCNPs as labels and sensors. This could also open new possibilities for multi-wavelength excitable UCNPs for upconversion color display and in laser-scanning microscopy providing selective readouts and sub-sectioning of samples.

NATURVETENSKAP Kemi Teoretisk kemi hsv//swe
NATURAL SCIENCES Chemical Sciences Theoretical Chemistry hsv//eng
NATURVETENSKAP Fysik Atom- och molekylfysik och optik hsv//swe
NATURAL SCIENCES Physical Sciences Atom and Molecular Physics and Optics hsv//eng
Color tunability
Kinetics
Laser scanning microscopy
Saturation
Upconversion
Enzyme kinetics
Laser applications
Luminescence
Nanoparticles
Saturation (materials composition)
Excitation intensity
Excitation wavelength
Multi-wavelengths
Up-conversion
Upconversion luminescence
Upconversion nanoparticles
Light
Theoretical Chemistry and Biology
Teoretisk kemi och biologi
Theoretical Physics
Teoretisk fysik

Liu, QingyunKTH,Teoretisk kemi och biologi(Swepub:kth)u10zpcmp (författare)
Bergstrand, JanKTH,Kvant- och biofotonik(Swepub:kth)u1xi97g1 (författare)
Pu, R.Centre for Optical and Electromagnetic Research, Guangdong Provincial Key Laboratory of Optical Information (författare)
Zhan, Q.Centre for Optical and Electromagnetic Research, Guangdong Provincial Key Laboratory of Optical Information (författare)
Ara, M. H. M.Photonics Laboratory, Physics Department, Kharazmi University, Tehran, Iran (författare)
Ågren, HansKTH,Teoretisk kemi och biologi(Swepub:kth)u1l2s96v (författare)
Liu, HaichunKTH,Teoretisk kemi och biologi(Swepub:kth)u1mn5cz0 (författare)
Widengren, JerkerKTH,Kvant- och biofotonik(Swepub:kth)u1i3g09c (författare)
KTHKvant- och biofotonik (creator_code:org_t)

Av författaren/redakt...: Bagheri, Niusha; Liu, Qingyun; Bergstrand, Jan; Pu, R.; Zhan, Q.; Ara, M. H. M.; visa fler...; Ågren, Hans; Liu, Haichun; Widengren, Jerke ...; visa färre...

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