We have analyzed the dynamics of the upconversion-induced delayed fluorescence for a model multicomponent organic system, in which high concentrations of triplet states can be sustained in steady-state conditions. At different excitation powers, two regimes have been identified depending on the main deactivation channel for the triplets, namely, the spontaneous decay and the bimolecular annihilation. The excitation power density at which triplet bimolecular annihilation becomes dominant is the threshold (I<sub>th</sub>) to have efficient upconversion generation. The simple equation obtained for I <sub>th</sub> allows us to predict the theoretical efficiency of a generic system on the basis of few parameters of the constituent molecules. © 2008 The American Physical Society.

Monguzzi, A., Mézyk, J., Scotognella, F., Tubino, R., & Meinardi, F. (2008). Upconversion-induced fluorescence in multicomponent systems: Steady-state excitation power threshold. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 78 [10.1103/PhysRevB.78.195112].

Upconversion-induced fluorescence in multicomponent systems: Steady-state excitation power threshold

MONGUZZI, ANGELO MARIA;TUBINO, RICCARDO;MEINARDI, FRANCESCO
2008

Abstract

We have analyzed the dynamics of the upconversion-induced delayed fluorescence for a model multicomponent organic system, in which high concentrations of triplet states can be sustained in steady-state conditions. At different excitation powers, two regimes have been identified depending on the main deactivation channel for the triplets, namely, the spontaneous decay and the bimolecular annihilation. The excitation power density at which triplet bimolecular annihilation becomes dominant is the threshold (Ith) to have efficient upconversion generation. The simple equation obtained for I th allows us to predict the theoretical efficiency of a generic system on the basis of few parameters of the constituent molecules. © 2008 The American Physical Society.
No
Articolo in rivista - Articolo scientifico
Scientifica
Upconversion, organic molecules, photoluminescence
English
Monguzzi, A., Mézyk, J., Scotognella, F., Tubino, R., & Meinardi, F. (2008). Upconversion-induced fluorescence in multicomponent systems: Steady-state excitation power threshold. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 78 [10.1103/PhysRevB.78.195112].
Monguzzi, A; Mézyk, J; Scotognella, F; Tubino, R; Meinardi, F
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/5913
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