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Stokes shift energy migration

Energy transfer has also been investigated in PbS04 ). The Stokes shift of the Pb emission is large (2 eV). Although several activators were introduced into this lattice, not any evidence for exciton migration could be found. [Pg.76]

In (La,Ce)P04 the Stokes shift of the emission is smaller 60(X) cm ), and the emi.sston of CeP04 is partly concentration quenched. Energy migration over the Ce ions assists in the transfer to iV and less Tb is needed. Nevertheless the UV output is relatively high (see Table 6.1). This is due to the fact that the Ce -Ce transfer is more efficient than the Ce +-Tb + transfer. At the shortest intemuclear rare-earth distance the transfer rates amount to 10"s and 3 x lO s, respectively. This phosphor system has been discussed at length recently [21]. [Pg.121]

Cel s is a material with 100% activator concentration. As argued in Sect. 5.3.2, the laige Stokes shift of the Ce emission localizes the excited state, so that concentration quenching by energy migration does not occur. [Pg.186]


See other pages where Stokes shift energy migration is mentioned: [Pg.632]    [Pg.26]    [Pg.40]    [Pg.387]    [Pg.387]    [Pg.188]    [Pg.22]    [Pg.36]    [Pg.72]    [Pg.81]    [Pg.85]    [Pg.81]    [Pg.13]    [Pg.105]    [Pg.105]    [Pg.312]    [Pg.153]   
See also in sourсe #XX -- [ Pg.35 ]

See also in sourсe #XX -- [ Pg.387 ]




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