Abstract
We demonstrated an efficient two-photon near-infrared (NIR) quantum cutting (QC) in Ho 3+–Yb 3+ co-doped hexagonal β-NaYF 4, which could efficiently convert an incident high-energy photon in the wavelength region of 300–550 nm into two NIR photons. Underlying mechanism for the two-photon NIR-QC process is analyzed in terms of static and dynamic photoemission and monitored excitation spectra. It is found that NIR-QC can occur through two possible energy transfer (ET) approaches: (i) the excited Ho 3+: 5F 3 state may simultaneously excite two Yb 3+ neighbors via a cooperative ET process, and (ii) the NIR-QC can be feasibly induced by a first Ho 3+( 5S 2, 5F 4) + Yb 3+( 2F 7/2) → Ho 3+( 5I 6) + Yb 3+( 2F 5/2) resonant ET process and a sequential 5I 6 → 5I 8 transition of Ho 3+. This novel NaYF 4:Ho 3+,Yb 3+ NIR-QC phosphor, may explore a new approach to maximize the performance of solar cells.
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