Open AccessDiffusion Enhanced Upconversion in Organic Systems
Author(s) -
Angelo Monguzzi,
R. Tubino,
Francesco Meinardi
Publication year - 2008
Publication title -
international journal of photoenergy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.426
H-Index - 51
eISSN - 1687-529X
pISSN - 1110-662X
DOI - 10.1155/2008/684196
Subject(s) - photon upconversion , phosphorescence , excited state , diffusion , annihilation , singlet state , excitation , fluorescence , photochemistry , singlet fission , chemistry , oled , energy transfer , molecule , atomic physics , chemical physics , materials science , optoelectronics , luminescence , optics , thermodynamics , physics , organic chemistry , quantum mechanics , layer (electronics)
The upconverted fluorescence generation in a solution of multicomponent organic systems has been studied as a function of the temperature to investigate the role of resonant energy transfer processes and of the molecular diffusion on the overall emission yield. The strong blue emission observed exciting the samples at 532 nm derives from a bimolecular triplet-triplet annihilation between 9,10 diphenylanthracene molecules, which produces singlet excited states from which the higher energy emission takes place. Diphenylanthracene excited triplet states are populated by energy transfer from a phosphorescent donor (Pt(II)octaethylporphyrin) which acts as excitation light harvesting. At low temperature, the experimental data on the efficiency of the transfer have been interpreted in the frame of a Dexter energy transfer in the Perrin approximation. At room temperature, the fast diffusion of the molecules has been found to be the main factor which affects the energy transfer rates and the overall photon upconversion efficiency
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