2016/02/29 by Anastasia Vassilakopoulou, Dionysios Papadatos, Ioannis Zakouras +1 · 50 citations
Chemistry · Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Band gap #Chemical physics #Chemistry #Crystallography #Diode #Halide #Inorganic chemistry #Light-emitting diode #Luminescence and Fluorescent Materials #Materials science #Optoelectronics #Organic semiconductor #Perovskite (structure) #Perovskite Materials and Applications #Semiconductor #cond-mat.mtrl-sci
paper · pdf · doi:10.1016/j.jallcom.2016.09.076
published in Journal of Alloys and Compounds 692, 589-598 (Elsevier BV) · 7 Figures, 1 table, total of 40 pages including references and supplementary info of 9 images and text
arxiv created 2016/08/31 · openalex publication_date 2016/09/12 · arxiv updated 2017/01/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
New blends of simply synthesized quasi two-dimensional (quasi-2D) hydrophobic perovskite semiconductors, employed in high performance light emitting diodes (LEDs) which function due to excitonic energy transfer effects, are reported. These materials are self-assembled blends of 2D, quasi-2D and three-dimensional (3D) hybrid organic-inorganic semiconductors (HOIS). Moreover, shown for the first time, crude mixing of 3D perovskite and unprotonated amines provides similar semiconductors. HOIS reported here are based on the organic cations CH3NH3+, CH3(CH2)7CH=CH(CH2)8NH3+ or C6H5CH2CH2NH3+ and inorganic networks formed out of PbX42- anions (X=I, Br, Cl). HOIS exhibit strong bound excitonic states with increased oscillator strength at room temperature, tunable via simple halide substitution. HOIS blends manifest energy transfer effects, where adjacent nanoparticles of different band gap energies (Eg) transfer optical energy to those with the lowest Eg; the suggested light emission mechanism here. LED fabrication is attained via a single deposition of the hydrophobic mixture, reducing device complexity, cost and degradability. LED's diodic behavior is observed even under light albeit its photovoltaic and photoconductive quasi-2D and 3D components. LED devices exposed for over than four months under adverse laboratory conditions, showed stable light emission. Further research on this class of quasi-2D/3D HOIS mixtures is expected to lead to novel quantum electronic devices.