Is there any upconverting nanoparticles with high quantum efficiency (preferable emission in red), which can be excited using sunlight ( NIR band).
As stated above by Rupesh Talewar, theoretically there is no physical reason for upconversion to be impossible under solar excitation if excitation intensity is high enough. But to see it, you will definitely need to remove visible part of solar radiation with some filter to be able to distinguish your emission due to upconversion from scattering, fluorescence etc.
I think it is possible. However the intensity of the excitation should be high enough so that you may see the red upconverting emission.
As stated above by Rupesh Talewar, theoretically there is no physical reason for upconversion to be impossible under solar excitation if excitation intensity is high enough. But to see it, you will definitely need to remove visible part of solar radiation with some filter to be able to distinguish your emission due to upconversion from scattering, fluorescence etc.
Dear Sunil! I agree with previous suggestions. Also you should take to account solar light spectrum (see attached file), because light intensity decreases with wavelength increasing. Moreover atmosphere absorb radiation of about 800 and 900-950 nm. So, I think, you need very effective up-converting system, which work at short wavelengths.
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