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

• 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.

Ämnesord

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)

Nyckelord

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

Publikations- och innehållstyp

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