Influence of Energy Transfer by the Exchange Mechanism on Donor Luminescence

Abstract

The decay of donor luminescence in a rigid solution when modified by electronic energy transfer by the exchange mechanism is treated theoretically. The rate constant for the elementary process of energy transfer is taken to be of the Dexter form, const exp(−2R/L), where R is the donor—acceptor distance and L is a positive constant. Calculations are made of the yield and decay time of the donor luminescence as functions of the acceptor concentration. The resulting relationship among the above quantities enables one to analyze experimental data in a quantitative manner, and thereby to obtain information about an intermolecular exchange interaction. As an example of such an analysis, Ermolaev's data on triplet—triplet transfer between some aromatic molecules are compared with our results, and very good agreement is found with a choice of the single parameter L.

Luminescence and energy migration in a two-dimensional system: NaEuTiO4

“…These expressions are described extensively in refs. [13][14][15][16][17][18].As stated before the lanthanide ions form double layers perpendicular to the c-axis. The distance between these layers (-10 A) is considerably larger than the distance between two lanthanide ions in the layers (- 3.7 A).…”

Short-range order effect on resonance energy transfer in rigid solution

“…This parameter takes values from )3 to 20 [11,13,14,19], depending on the system. Note that a low value of c can result either from a low absolute quenching effect (low k 0 ), or from a short intrinsic lifetime s 0 .…”

“…Following [11], we will also consider such three cases. Namely, in our numerical calculation, we will use values c ¼ À2, 4, and 10 and L=d ¼ 0:2, 0.5, and 0.8 as typical experimental values [4,11,19].…”

Investigation on upconversion luminescence in Yb3+/Er3+‐codoped Gd2SiO5 single crystal

“…So the ET efficiency will play an important role in Yb,Er:GSO crystal. The ET efficiency h can be expressed as [22] [1][2][3] that the green upconversion emission was brighter than the red emission. Figure 3 shows the log-log plot of the upconversion luminescence as a function of pumping power at 940 nm of Yb,Er:GSO crystal.…”