Mesoscopic Perovskite Light-Emitting Diodes.
Solution-processed hybrid bromide perovskite light-emitting-diodes (PLEDs) represent an attractive alternative technology that would allow overcoming the well-known severe efficiency drop in the green spectrum related to conventional LEDs technologies. In this work, we report on the development and characterization of PLEDs fabricated using, for the first time, a mesostructured layout. Stability of PLEDs is a critical issue; remarkably, mesostructured PLEDs devices tested in ambient conditions and without encapsulation showed a lifetime well-above what previously reported with a planar heterojunction layout. Moreover, mesostructured PLEDs measured under full operative conditions showed a remarkably narrow emission spectrum, even lower than what is typically obtained by nitride- or phosphide-based green LEDs. A dynamic analysis has shown fast rise and fall times, demonstrating the suitability of PLEDs for display applications. Combined electrical and advanced structural analyses (Raman, XPS depth profiling, and ToF-SIMS 3D analysis) have been performed to elucidate the degradation mechanism, the results of which are mainly related to the degradation of the hole-transporting material (HTM) and to the perovskite-HTM interface.
C.H.O.S.E. (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome Tor Vergata , Via del Politecnico 1, 00133 Rome, Italy.
Alessandro Lorenzo
AL
Palma
C.H.O.S.E. (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome Tor Vergata , Via del Politecnico 1, 00133 Rome, Italy.
Lucio
L
Cinà
Department of Physics, Research Center in Physics of Matter and Radiation (PMR), LISE Laboratory, Université de Namur ASBL , Rue de Bruxelles 61, 5000 Namur, Belgium.
Yan
Y
Busby
C.H.O.S.E. (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome Tor Vergata , Via del Politecnico 1, 00133 Rome, Italy.
Andrea
A
Marsella
C.H.O.S.E. (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome Tor Vergata , Via del Politecnico 1, 00133 Rome, Italy.
Antonio
A
Agresti
C.H.O.S.E. (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome Tor Vergata , Via del Politecnico 1, 00133 Rome, Italy.
Sara
S
Pescetelli
Department of Physics, Research Center in Physics of Matter and Radiation (PMR), LISE Laboratory, Université de Namur ASBL , Rue de Bruxelles 61, 5000 Namur, Belgium.
Jean-Jacques
JJ
Pireaux
C.H.O.S.E. (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome Tor Vergata , Via del Politecnico 1, 00133 Rome, Italy.
Aldo
A
Di Carlo
Raman; ToF-SIMS; XPS; aging effects; characterization; light-emitting diode; mesoscopic; perovskite