The European Union set the ambitious target of reducing energy consumption by 20% within 2020. This goal demands a tremendous change in how we generate and consume energy and urgently calls for an aggressive policy on energy efficiency. Since 19% of the European electrical energy is used for lighting, considerable savings can be achieved with the development of novel and more efficient lighting concepts [1]. In this talk, some selected objectives accomplished in the frame of the EU project CELLO will be briefly presented [2a]. The main target of this project was to develop highly efficient, flat, low cost and flexible electroluminescent devices termed Light-Emitting Electrochemical Cells (LECs), based on cationic cyclometalated iridium(III) complexes [2]. After a short introduction about LECs and solid-state lighting, the research carried out on cyclometalated iridium(III) complexes displaying light output in two extreme sides of the visible spectral window, namely deep-blue [3] and red/near-infrared (NIR) [4], will be presented. The former luminophores tend to be rather challenging due to emission red-shift in the solid state and instability under operative conditions, the latter may serve also as interesting options where NIR luminescence is crucial, such as telecommunications and bioimaging. Since LECs are based on a single active material, the importance of an integrated approach toward the right selection of suitable emitters not only in terms of photophysical properties but also from the point of view of stability and cost will be highlighted [5]. In fact, the active iridium(III) complex, once in the device, is interacting with added ionic liquids, metal cathodes, electric fields, etc. All these interactions must be taken into account in order to develop lighting devices that can move from research labs to the market. [1] (a) L. S. Brown, Plan B. Mobilizing to save the civilization, W. W. Norton & Company, New York, 2009. (b) Light's Labour's Lost - Policies for Energy-efficient Lighting, tech. rep., International Energy Agency, 2006. [2] (a) https://www.cello-project.eu/ (b) R. D. Costa, E. Orti, H. J. Bolink, F. Monti, G. Accorsi, and N. Armaroli, Angew. Chem., Int. Ed., 2012, 51, 8178-8211. [3] (a) N. M. Shavaleev, F. Monti, R. D. Costa, R. Scopelliti, H. J. Bolink, E. Ortí, G. Accorsi, N. Armaroli, E. Baranoff, M. Grätzel, and M. K. Nazeeruddin, Inorg. Chem., 2012, 51, 2263-2271. (b) N. M. Shavaleev, F. Monti, R. Scopelliti, N. Armaroli, M. Grätzel, and M. K. Nazeeruddin, Organometallics, 2012, 31, 6288-6296. (c) N. M. Shavaleev, F. Monti, R. Scopelliti, A. Baschieri, L. Sambri, N. Armaroli, M. Grätzel, and M. K. Nazeeruddin, Organometallics, 2013, 32, 460-467. (d) F. Monti, F. Kessler, M. Delgado, J. Frey, F. Bazzanini, G. Accorsi, N. Armaroli, H. J. Bolink, E. Ortí, R. Scopelliti, M. K. Nazeeruddin, and E. Baranoff, Inorg. Chem., 2013, 52, 10292-10305. [4] E. C. Constable, M. Neuburger, P. Rösel, G. E. Schneider, J. A. Zampese, C. E. Housecroft, F. Monti, N. Armaroli, R. D. Costa, and E. Ortí, Inorg. Chem., 2013, 52, 885-897. [5] R. D. Costa, F. Monti, G. Accorsi, A. Barbieri, H. J. Bolink, E. Ortí, and N. Armaroli, Inorg. Chem., 2011, 50, 7229-7238.
Luminscent cationic cyclometalated Iridium(III) complexes for light-emitting electrochemical cells
Filippo Monti;Gianluca Accorsi;Nicola Armaroli
2014
Abstract
The European Union set the ambitious target of reducing energy consumption by 20% within 2020. This goal demands a tremendous change in how we generate and consume energy and urgently calls for an aggressive policy on energy efficiency. Since 19% of the European electrical energy is used for lighting, considerable savings can be achieved with the development of novel and more efficient lighting concepts [1]. In this talk, some selected objectives accomplished in the frame of the EU project CELLO will be briefly presented [2a]. The main target of this project was to develop highly efficient, flat, low cost and flexible electroluminescent devices termed Light-Emitting Electrochemical Cells (LECs), based on cationic cyclometalated iridium(III) complexes [2]. After a short introduction about LECs and solid-state lighting, the research carried out on cyclometalated iridium(III) complexes displaying light output in two extreme sides of the visible spectral window, namely deep-blue [3] and red/near-infrared (NIR) [4], will be presented. The former luminophores tend to be rather challenging due to emission red-shift in the solid state and instability under operative conditions, the latter may serve also as interesting options where NIR luminescence is crucial, such as telecommunications and bioimaging. Since LECs are based on a single active material, the importance of an integrated approach toward the right selection of suitable emitters not only in terms of photophysical properties but also from the point of view of stability and cost will be highlighted [5]. In fact, the active iridium(III) complex, once in the device, is interacting with added ionic liquids, metal cathodes, electric fields, etc. All these interactions must be taken into account in order to develop lighting devices that can move from research labs to the market. [1] (a) L. S. Brown, Plan B. Mobilizing to save the civilization, W. W. Norton & Company, New York, 2009. (b) Light's Labour's Lost - Policies for Energy-efficient Lighting, tech. rep., International Energy Agency, 2006. [2] (a) https://www.cello-project.eu/ (b) R. D. Costa, E. Orti, H. J. Bolink, F. Monti, G. Accorsi, and N. Armaroli, Angew. Chem., Int. Ed., 2012, 51, 8178-8211. [3] (a) N. M. Shavaleev, F. Monti, R. D. Costa, R. Scopelliti, H. J. Bolink, E. Ortí, G. Accorsi, N. Armaroli, E. Baranoff, M. Grätzel, and M. K. Nazeeruddin, Inorg. Chem., 2012, 51, 2263-2271. (b) N. M. Shavaleev, F. Monti, R. Scopelliti, N. Armaroli, M. Grätzel, and M. K. Nazeeruddin, Organometallics, 2012, 31, 6288-6296. (c) N. M. Shavaleev, F. Monti, R. Scopelliti, A. Baschieri, L. Sambri, N. Armaroli, M. Grätzel, and M. K. Nazeeruddin, Organometallics, 2013, 32, 460-467. (d) F. Monti, F. Kessler, M. Delgado, J. Frey, F. Bazzanini, G. Accorsi, N. Armaroli, H. J. Bolink, E. Ortí, R. Scopelliti, M. K. Nazeeruddin, and E. Baranoff, Inorg. Chem., 2013, 52, 10292-10305. [4] E. C. Constable, M. Neuburger, P. Rösel, G. E. Schneider, J. A. Zampese, C. E. Housecroft, F. Monti, N. Armaroli, R. D. Costa, and E. Ortí, Inorg. Chem., 2013, 52, 885-897. [5] R. D. Costa, F. Monti, G. Accorsi, A. Barbieri, H. J. Bolink, E. Ortí, and N. Armaroli, Inorg. Chem., 2011, 50, 7229-7238.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
