Exploiting Photo- and Electroluminescence Properties of FIrpic Organic Crystals.
In this work, we investigate the optical and structural properties of the well-known triplet emitter bis(4',6'-difluorophenylpyridinato)-iridium(III) picolinate (FIrpic), showing that its ability to pack in two different ordered crystal structures promotes attractive photophysical properties that are useful for solid-state lighting applications. This approach allows the detrimental effects of the nonradiative pathways on the luminescence performance in highly concentrated organic active materials to be weakened. The remarkable electro-optical behavior of sky-blue phosphorescent organic light-emitting diodes incorporating crystal domains of FIrpic, dispersed into an appropriate matrix as an active layer, has also been reported as well as the X-ray diffraction, nuclear magnetic resonance, electro-ionization mass spectrometry, and scanning electron microscopy analyses of the crystalline samples. We consider this result as a crucial starting point for further research aimed at the use of a crystal triplet emitter in optoelectronic devices to overcome the long-standing issue of luminescence self-quenching.
Department of Mathematics and Physics "Ennio De Giorgi", University of Salento , Campus Universitario, via Monteroni, 73100 Lecce, Italy.
Antonio
A
Maggiore
Department of Mathematics and Physics "Ennio De Giorgi", University of Salento , Campus Universitario, via Monteroni, 73100 Lecce, Italy.|Echolight srl, R&D Dpt, campus Ecotekne, via per monteroni, 73100 Lecce, Italy.
Marco
M
Pugliese
Department of Mathematics and Physics "Ennio De Giorgi", University of Salento , Campus Universitario, via Monteroni, 73100 Lecce, Italy.|CNR-ISOF, Istituto per la Sintesi e la Fotoreattività, Consiglio Nazionale delle Ricerche , 40129 Bologna, Italy.
Francesca
F
Di Maria
CNR NANOTEC-Institute of Nanotechnology c/o Campus Ecotekne, University of Salento , Via Monteroni, 73100 Lecce, Italy.
Gianluca
G
Accorsi
CNR-ISOF, Istituto per la Sintesi e la Fotoreattività, Consiglio Nazionale delle Ricerche , 40129 Bologna, Italy.
Massimo
M
Gazzano
Istituto Nanoscienze-CNR, Euromediterranean Center for Nanomaterial Modelling and Technology (ECMT), Via per Arnesano, 73100 Lecce, Italy.|Center for Biomolecular Nanotechnologies @UNILE, Istituto Italiano di Tecnologia, Via Barsanti, I-73010 Arnesano, Italy.
Eduardo
E
Fabiano
CNR NANOTEC-Institute of Nanotechnology c/o Campus Ecotekne, University of Salento , Via Monteroni, 73100 Lecce, Italy.
Vittorianna
V
Tasco
Department of Mathematics and Physics "Ennio De Giorgi", University of Salento , Campus Universitario, via Monteroni, 73100 Lecce, Italy.
Marco
M
Esposito
CNR NANOTEC-Institute of Nanotechnology c/o Campus Ecotekne, University of Salento , Via Monteroni, 73100 Lecce, Italy.
Massimo
M
Cuscunà
CNR NANOTEC-Institute of Nanotechnology c/o Campus Ecotekne, University of Salento , Via Monteroni, 73100 Lecce, Italy.
Laura
L
Blasi
CNR NANOTEC-Institute of Nanotechnology c/o Campus Ecotekne, University of Salento , Via Monteroni, 73100 Lecce, Italy.
Agostina
A
Capodilupo
CNR NANOTEC-Institute of Nanotechnology c/o Campus Ecotekne, University of Salento , Via Monteroni, 73100 Lecce, Italy.|Department of Biological and Environmental Sciences and Technologies, University of Salento & Udr INSTM of Lecce.
Giuseppe
G
Ciccarella
Department of Mathematics and Physics "Ennio De Giorgi", University of Salento , Campus Universitario, via Monteroni, 73100 Lecce, Italy.|CNR NANOTEC-Institute of Nanotechnology c/o Campus Ecotekne, University of Salento , Via Monteroni, 73100 Lecce, Italy.
Giuseppe
G
Gigli
CNR NANOTEC-Institute of Nanotechnology c/o Campus Ecotekne, University of Salento , Via Monteroni, 73100 Lecce, Italy.
Vincenzo
V
Maiorano