Abstract
New light sources in the near infrared (NIR) are requested in the field of telecommunications, especially to develop amplifiers for Local Area Networks. Organic Er3+ complexes have been recently proposed as a promising alternative to the well known silica-based systems. Devices based on these molecules show many advantages in respect to the traditional ones and should allow to realize compact and cheap optical amplifiers, possibly also by using electric excitation. Although a large number of complexes exhibiting NIR emission at 1.5 μm has been synthesized, expectations to obtain high efficiency emitters have been not fulfilled. This is due to the non-radiative de-excitation mechanisms which are more efficient in Er^organic complexes than in inorganic matrix. Deep knowledge and exact evaluation of these processes are necessary to drive the chemical synthesis of more efficient systems. In this work we have developed a model for the non radiative de-excitation of Er34 ions in organic complexes based on the energy transfer process between the 4Ii3/2-4Ii5/2 transition of Errand C-H stretching overtones. According to the Forster's theory of dipole-dipole interactions, the transfer rate is determined by the distance between donors (Er34) and acceptors (C-H bonds), and by the spectral overlap between the corresponding electronic and vibrational levels. These quantities have been evaluated for the Er3Q9 [Erbium(III)tris(8-hydroxyquinoline)].
© 2007 IEEE
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