Photonics - Research Activities - Optoelectronic Devices

Massimo Cocchi, Valeria Fattori

Organic light emitting devices have been the focus of our research since many years.
A special attention is devoted to find out luminescent compounds with high quantum yields to be exploited as efficient emitters in OLEDs. Cyclometalated organic complexes of heavy metals -Pt(II) and Ir(III) in particular- together with Cu(I) organic and hybrid complexes are the major interests of our research activity and solid state molecular behaviour together with intermolecular interactions have been deeply studied for this type of compounds. In collaborations with synthetic scientists we have developed novel Pt complexes able to produce, in the solid state, highly luminescent supramolecular species (dimers, excimers, aggregates). By carefully designing the device structure and the layers’ compositions we have prepared bright and efficient devices having emissions in different spectral regions:

  • OLEDs blue green red emissions for displays
  • NIR OLEDs near infrared emission for bio-medicine and telecommunications
  • WOLEDs white emission for lighting
Relevant contribution
Chapter 10. Tuning the colour and efficiency of OLEDs
M. COCCHI - National Research Council of Italy and Consortium MIST E-R scrl, Italy.
Abstract: This chapter provides an overview on the road map used to tune the colour and efficiency of organic light emitting devices (OLEDs). A comprehensive introduction to the potential of OLED technology is first provided. Then attention is given on one way to obtain a multi- emission by a single phosphor, making use of platinum(II) complexes as phosphorescent emitters.

Collaborations
Laboratorio MIST E-R (Tecnopolo AMBIMAT, Area di Ricerca CNR di Bologna, Italy), Dominique Roberto (University of Milano, Italy), Stefano Stagni (University of Bologna, Italy), Lucia Maini (University of Bologna, Italy), Massimiliano Massi (Curtin University, Australia), J. A. Gareth Williams (University of Durham, U.K.), K. I. Sathiyanarayanan (VIT University, India)