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(UJI - UVEG) S. Das Adhikari, C. Echeverría-Arrondo, R. S. Sánchez, V. S. Chirvony, J. P. Martínez-Pastor, S. Agouram, V. Muñoz-Sanjosé, I. Mora-Seró

White Light Emission from Lead-Free Mixed-Cation Doped Cs2SnCl6 Nanocrystals

Nanoscale 2022, online


We have designed a synthesis procedure to obtain Cs2SnCl6 nanocrystals (NCs) doped with metal ion(s) to emit visible light. Cs2SnCl6 NCs doped with Bi3+, Te4+ and Sb3+ ions emitted blue, yellow and red light, respectively. In addition, NCs simultaneously doped with Bi3+ and Te4+ ions were synthesized in a single run. Combination of both dopant ions together gives rise to the white emission. The photoluminescence quantum yields of the blue, yellow and white emissions are up to 26.5, 28, and 16.6%, respectively under excitation at 350, 390, and 370 nm. Pure white-light emission with CIE chromaticity coordinates of (0.32, 0.33) and (0.32, 0.32) at 340 and 370 nm excitation wavelength, respectively, was obtained. The as-prepared NCs were found to demonstrate a long-time stability, resistance to humidity, and an ability to be well-dispersed in polar solvents without property degradation due to their hydrophilicity, which could be of significant interest for wide application purposes.


(INSA) A. Skorokhod, N. Mercier, M. Allain, M. Manceau, C. Katan, and M. Kepenekian

From Zero- to One-Dimensional, Opportunities and Caveats of Hybrid Iodobismuthates for Optoelectronic Applications

Inorganic Chemistry, 2021, 60, 17123–17131.


The association of the electron acceptor 4,4′-amino-bipyridinium (AmV2+) dication and BiI3 in an acidic solution affords three organic–inorganic hybrid materials, (AmV)3(BiI6)2 (1), (AmV)2(Bi4I16) (2), and (AmV)BiI5 (3), whose structures are based on isolated BiI63– and Bi4I164– anion clusters in 1 and 2, respectively, and on a one-dimensional (1D) chain of trans-connected corner-sharing octahedra in 3. In contrast with known methylviologen-based hybrids, these compounds are more soluble in polar solvents, allowing thin film formation by spin-coating. (AmV)BiI5 exhibits a broad absorption band in the visible region leading to an optical bandgap of 1.54 eV and shows a PV effect as demonstrated by a significant open-circuit voltage close to 500 mV. The electronic structure of the three compounds has been investigated using first-principles calculations based on density functional theory (DFT). Unexpectedly, despite the trans-connected corner-shared octahedra, for (AmV)BiI5, the valence state shows no coupling along the wire direction, leading to a high effective mass for holes, while in contrast, the strong coupling between Bi 6px orbitals in the same direction at the conduction band minimum suggests excellent electron transport properties. This contributes to the low current output leading to the low efficiency of perovskite solar cells based on (AmV)BiI5. Further insight is provided for trans- and cis-MI5 1D model structures (M = Bi or Pb) based on DFT investigations.


February 2022

* Synthesis (and inks) of 3D tin-perovskites:  

(From molecular precursors) FASnI3, MASnI3,(FA-MA)SnI3, FASnBr3, MASnBr3,(FA-MA)SnBr3

(NCs) FASnI3, CsSnI3, CsSnBr3   

* Synthesis (and inks) of 2D and 2D/3D tin-perovskites:  

(From molecular precursors) (TEA)2SnI4, PEA2SnI4-xBrx

(NCs) (OLAm)2SnI4, OLAm/PEA)2SnI

* Synthesis (and inks) of double perovskites:

Cs2AgBiBr6, Cs2Ag0.4Na0.6InCl6:Bi, Cs2NaInCl6, Cs2KInCl6

Cs2SnI6, Cs2SnCl6 (Bi3+/Te4+ and Sb3+ doped) 

* Synthesis (and inks) of other halides and perovskite-like materials:

FA3Bi2Br9, Cs3Sb2Br9, Ag2BiI5, Ag3BiI6, Cs2InBr5, Rb3InCl6:Sb


Cs3Cu2I5, Cs3Cu2(Cl/I)5, Cs3Cu2(Cl/I)5:Mn, CsCu2Cl3, Cs3Cu2Cl5.

* Theory: Perovskites, Cs2ZrBr6 and Cs2ZrI6, Cs2TiBr6, Cs2TiI6, Ag2BiI5, Ag3BiI6

* Ink development of metal oxides as inorganic Hole / Electron Transport Layers: 

 InOx, LiNiOx, NiOx, ZnInOx, CsNiOx, NiOx

* SOLAR CELLS: Stable photovoltaic solar cells based on FASnI3 over 1300 h with efficiency  10.6 %, by using appropriated additives. First solar cells fabricated by using doctor blading an inkjet printing deposition of FASnI3 on flexible substrates. 

* LEDs: Selection of Red-Green-Blue emitting materials and preliminary architecture for LEDs. Study of the the FASnI3/C60 heterostructure interface. 

* PHOTONICS: Achievement of Amplified Spontaneous Emission in optical waveguides based on FASnI3 deposited (spin coating and inkjet printing) on flexible substrates. Random lasing can be measured in waveguides and backscattering geometry. The waveguide geometry is ideal to promote photon recycling effect in metal halide perovskites. Some lead-free perovskites exhibits outstanding nonlinear optical properties.

DROP-IT has received funding from the European Union’s Horizon 2020 FET-OPEN research programme under grant agreement No 862656.