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A sequential two-step near-infrared quantum splitting in Ho3+ singly doped NaYF4
25. D. Knowles, A. Cassanho, and H. P. Jenssen, Tunable Solid State Laser 139,(1989). in Tunable Solid State Laser, L. D. Buggor, L. Esterowitz, and L. G. DeShazer, Eds. Berlin, Germany: Springer Verlag, 1989, pp. 139–145.
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We demonstrated an efficient sequential two-step near-infrared (NIR) quantum splitting (QS) in a Ho3+ singly dopedβ-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 photoemissionspectra 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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