Luminescence resonance energy transfer LRET

Luminescence resonance energy transfer (LRET), 347, 348 Luminol, 403 LuMnOs, 400... 

Two mechanisms are conceivable. The first is a luminescence resonance energy transfer (LRET) from the UCNPs to nearby molecules of the iridium (or other) probe for oxygen. Alternatively (or in addition), the UCNPs may act as nanolamps whose blue emission leads to the photoexcitation of the iridium complex. The applicability and full reversibility was demonstrated on alternately exposing the sensor film to argon and oxygen, which resulted in a fully reversible increase and decrease of the emission of the iridium(III) complex, respectively, as shown in Fig. 9... 

Wang Y, Wang G, O Kane DJ, Szalay AA. A study of protein protein interactions in living cells using luminescence resonance energy transfer (LRET) from Renilla luciferase to Aequorea GFP. Mol Gen Genet 2001 264 578-587. 

Luminescence resonance energy transfer (LRET) proceeds by radiationless dipole-dipole coupled energy transfer from an excited luminophore through space to another lumino-phore [30]. There are several criteria that must be met for LRET. First, the emission band of the excited luminophore donor must overlap the absorbance band of the acceptor luminophore. The distance between the donor and acceptor molecules can be measured by using Equation 8.2 [31]. In Equation 8.2, the efficiency of energy transfer is E, tda is the time-resolved luminescence lifetime of the donor-acceptor pair, tq is the lifetime of the donor, Rq is the distance for 50% energy transfer to occur (or Forster distance), and r is the calculated distance between the donor and acceptor. 

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