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A sequential two-step near-infrared quantum splitting in Ho3+ singly doped NaYF4

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Author(s): D. C. Yu | X. Y. Huang | S. Ye | Q. Y. Zhang | J. Wang

Journal: AIP Advances
ISSN 2158-3226

Volume: 1;
Issue: 4;
Start page: 042161;
Date: 2011;
Original page

ABSTRACT
We demonstrated an efficient sequential two-step near-infrared (NIR) quantum splitting (QS) in a Ho3+ singly doped β-NaYF4. An incident high-energy ultraviolet (UV)-to-visible photon in the wavelength range of 300−560 nm, which enables the Ho3+:5F4,5S2 states excited, could be efficiently split into two NIR photons at 1015 and 1180 nm. Underlying mechanisms for the sequential two-step NIR-QS process are analyzed in terms of the diffuse reflection spectrum, static and dynamic photoemission spectra and monitored excitation spectra. Internal quantum yield is obtained up to 110% on the basis of experimental and theoretical calculation results.
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