Quantum cutting by cooperative energy transfer in Ybx Y1-x P O4 : Tb3+

Details Quantum cutting by cooperative energy transfer in Ybx Y1-x P O4 : Tb3+ Quantum cutting by cooperative energy transfer in Ybx Y1-x P O4 : Tb3+

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvb..71a4119v&link_type=abstract

Physical Review B, vol. 71, Issue 1, id. 014119

Other

83

Oscillator Strengths, Lifetimes, Transition Moments, Other Multiphoton Processes, Radiationless Transitions, Quenching, Cooperative Phenomena In Quantum Optical Systems

Scientific paper

We present experimental evidence for cooperative energy transfer from Tb3+ to two Yb3+ ions and a determination of the energy-transfer rate. Energy transfer from Tb3+ to Yb3+ was investigated by luminescence measurements on ( Ybx Y1-x ) P O4 doped with 1% Tb3+ . Time-resolved luminescence experiments were analyzed using Monte Carlo simulations based on theories for phonon-assisted, cooperative, and accretive energy transfer. The luminescence decay curves of the 5D4 emission from Tb3+ show an excellent agreement with simulations based on cooperative energy transfer via dipole-dipole interaction, while a phonon-assisted or an accretive energy-transfer mechanism cannot explain the experimental results. The energy-transfer rate to two nearest-neighbor Yb3+ ions is 0.26 ms-1 . This corresponds to an upper limit of the energy-transfer efficiency of 88% in YbP O4 . Application of cooperative energy transfer has prospects for increasing the energy efficiency of crystalline Si solar cells by photon doubling of the high energy part of the solar spectrum.

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