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Transference activation energy

A schematic energy-level diagram of Cr3+ and Tm3+ in YAG together with the luminescence and absorption spectra of Cr3+ are shown in fig. 18. Three primary Cr3+ - Tm3+ energy transfer pathways can be identified thermally activated energy transfer from the 4T2 state (4T2 ET), thermally activated energy transfer from the 2E anti-Stokes phonon sidebands (2E anti-Stokes ET), and temperature-independent energy transfer from the zero phonon and Stokes phonon sidebands of the 2E state (2E Stokes ET). [Pg.575]

Direct pumping of poison centers as well as energy transfer from co-activators, and energy transfer from activators all represent an energy loss in the system. In addition, activators and co-activators also have non-radiative decay routes. Because non-radiative decay is usually phonon-assisted, non-radiative decay is exacerbated by increasing temperature and manifests itself by a characteristic temperature at which luminescence is quenched. The crystallographic relations that provide optimum sensitizer -activator energy transfer are outlined by Blasse (9)... [Pg.125]

Moreover, fluorescence characterization of these systems indicated, as previously hypothesized, that ruthenium(II) cationic complexes are able to activate energy transfer processes towards the anionic porphyrins [50]. [Pg.167]

Rempel, U., B. Vonmaltzan, and C. von Borczyskowski (1995). Competition between charge-transfer via superexchange and thermally activated energy-transfer in porphyrinheterodimer-quinone systems. Chem. Phys. Lett. 245. 253-261. [Pg.303]


See other pages where Transference activation energy is mentioned: [Pg.1035]    [Pg.36]    [Pg.96]    [Pg.90]    [Pg.94]    [Pg.368]    [Pg.1035]    [Pg.736]    [Pg.4]    [Pg.96]    [Pg.30]    [Pg.30]    [Pg.353]    [Pg.353]    [Pg.554]    [Pg.554]    [Pg.47]    [Pg.575]    [Pg.539]    [Pg.219]    [Pg.255]   
See also in sourсe #XX -- [ Pg.5 , Pg.25 ]




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