Abstract
The sensitization of scintillation was investigated in crosslinked polymeric composite materials loaded with luminescent gold clusters aggregates acting as sensitizers, and with organic dye rhodamine 6G as the emitting species. The evolution in time of the excited states population in the systems is described by a set of coupled rate equations, in which steady state solution allowed obtainment of an expression of the sensitization efficacy as a function of the characteristic parameters of the employed luminescent systems. The results obtained indicate that the realization of sensitizer/emitter scintillating complexes is the strategy that must be pursued to maximize the sensitization effect in composite materials.
Highlights
IntroductionThe scintillation of organic dyes is activated by direct energy transfer from the polymeric matrix where they are embedded, which is responsible of the primary interaction with the high-energy excitation beam
We introduce system of coupled rate equadescribes evolution excited of states in time during the during scintillation mechanism, tions that the describes the of evolution excited states in time the scintillation mechobtaining an obtaining expressionan of expression the sensitization as function of several parameters charanism, of theefficacy sensitization efficacy as function of several acteristic of the luminescent employed
The obtained findings demonstrate that active sensitization in multicomponent composite materials is possible by exploiting non-radiative energy transfer from high-density scintillators to efficient and fast molecular scintillators and it can be used to overcome the limits of passive sensitization strategy, such as the presence of inactive sensitizers that can detrimentally compete with the energy sharing mechanism in the system, reducing the final light output from the emitters (Figure 4)
Summary
The scintillation of organic dyes is activated by direct energy transfer from the polymeric matrix where they are embedded, which is responsible of the primary interaction with the high-energy excitation beam. The inclusion of heavy materials into the composite is exploited to enhance the interaction cross section of the ionizing radiation with the scintillator [2], increasing the fraction of deposited energy in the matrix. The first one is the direct transfer of a fraction of the increased deposited energy from the host matrix to the emitters [3], a process that we can consider as a passive sensitization mechanism
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