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Phys. Rev. B 78, 184302 (2008) [11 pages]Quantum cutting effect in KY3F10:Tm3+
Received 18 July 2008; published 6 November 2008
A cross-relaxation energy-transfer scheme using the 5d state of Tm3+ as the donor and the 4f13 states of Tm3+ as the acceptor is proposed. The scheme is tested in the host KY3F10 doped with several concentrations of Tm3+ as a potential vacuum ultraviolet (VUV) excited blue phosphor of quantum yield greater than unity. Emission and diffuse reflection spectra along with studies of the time evolution of the 5d and 4f populations of Tm3+ in KY3F10 crystals and powders under UV and VUV excitations are reported and analyzed. The results show that the proposed quantum cutting mechanism occurs but the 1I6, 1D2, and 1G4 acceptor levels cross relax rapidly to lower-lying levels by an additional cross-relaxation energy transfer and that this effectively quenches the blue emission. Based on the temperature dependence of the spectra, an interesting heat-assisted relaxation process involving intersystem crossing is observed above 300 K. ©2008 The American Physical Society
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