Excitonic Bands in the Spectra of Some Organic-Inorganic Hybrid Compounds Based on Metal Halide Units

Papavassiliou, George C.; Mousdis, George A.; Koutselas, Ioannis

doi:10.1007/978-3-7091-6276-7_11

Cited by 8 publications

(10 citation statements)

References 13 publications

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“…32 In this work we report a simple, instant and low cost method for the fabrication of a LED device constructed by a single active layer, composed of 0D, 3D and 2D HOIS blend. This blend containing specific (0D/3D):2D molar ratio, manifests simple, yet obvious energy transfer effects, 33 as these have been seen in semiconductor materials like CsPbBr3, [34][35][36] while similar phenomena in LED have been observed in recent publications. 37,38 LED device, presented herein, can function at room temperature, ambient air and low voltages while the EL emission is visible by naked eye.…”

Section: Introductionsupporting

confidence: 67%

“…In the past, it has been observed that even if the OA of the lowest Eg moiety, in a similar blend, is minimum, it is possible to have PL only at that lowest Eg energy. 33 As a result, all energy observed was being transferred from the high energy states to the lowest, by virtue of Forster like energy transfer, where superradiance effects certainly must be taken into account as these link the excitonic wave functions along with the radiation field. 44,45 However, in this previous total energy transfer observation, the materials had been literally grinded together to form a set of well split and adjoined quantum entities.…”

Section: Resultsmentioning

confidence: 99%

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Energy transfer yellow light emitting diodes based on blends of quasi-2D perovskites

Papadatos

Vassilakopoulou

Koutselas

2017

Journal of Luminescence

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The new class of hybrid organic-inorganic semiconductor (HOIS) materials, based on halide perovskites, is constantly being pursued for applications such as Light Emitting Diodes (LEDs) and solar cells, due to their momentous optoelectronic properties. In this work, we present a single layer LED that operates due to energy transfer effects as well as a simple, instant and low cost method for its fabrication. A LED device based on a mixture of zero dimensional (OD) (CH3NH3)4PbI6, two dimensional (2D) (F-C6H4CH2CH2NH2)2PbI4 and three dimensional (3D) (CH3NH3)PbI3 HOIS, is presented for the first time. The final composite material manifests simple, yet unique energy transfer optical effects, while its electroluminescence exhibits excitonic recombination bright yellow light, peaked at 592 nm. LED device fabricated under ambient air, readily functions at room temperature and low voltages. As for the active layer, it exhibited substantial film continuity in any form of deposition. Finally, with appropriate mixtures, it is possible to create films containing phase changes that exhibit dual color emission, here presented as yellow-green.3

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Section: Introductionsupporting

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Energy transfer yellow light emitting diodes based on blends of quasi-2D perovskites

Papadatos

Vassilakopoulou

Koutselas

2017

Journal of Luminescence

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“…Such excitonic peak energy is attributed to the PbI 3 chain network in several studies. 46,47 Analyzing the diffuse absorbance data, we get an E g at 3.1 eV (interception of extrapolated line with energy axis in Figure 5). Such high band gap values are accordingly estimated in other 1D perovskites such as [tetrabutylammonium][PbI 3 ] 48 (2.76 eV), CsPbI 3 49 (3.05 eV), or even (CH 3 ) 3 NHGeI 3 50 (2.88 eV).…”

Section: Chemical and Thermal Stabilitymentioning

confidence: 99%

Trimethylsulfonium Lead Triiodide: An Air-Stable Hybrid Halide Perovskite

et al. 2017

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We report on the synthesis, characterization, and optoelectronic properties of the novel trimethylsulfonium lead triiodide perovskite, (CH)SPbI. At room temperature, the air-stable compound adopts a hexagonal crystal structure with a 1D network of face-sharing [PbI] octahedra along the c axis. UV-vis reflectance spectroscopy on a pressed pellet revealed a band gap of 3.1 eV, in agreement with first-principles calculations, which show a small separation between direct and indirect band gaps. Electrical resistivity measurements on single crystals indicated that the compound behaves as a semiconductor. According to multi-temperature single-crystal X-ray diffraction, synchrotron powder X-ray diffraction, Raman spectroscopy, and differential scanning calorimetry, two fully reversible structural phase transitions occur at -5 and ca. -100 °C with reduction of the unit cell symmetry to monoclinic as temperature decreases. The role of the trimethylsulfonium cation regarding the chemical stability and optoelectronic properties of the new compound is discussed in comparison with APbI (A = Cs, methylammonium, and formamidinium cation), which are most commonly used in perovskite solar cells.

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“…A schematic QW picture was introduced for layered perovskites yielding a simple and efficient framework to perform analogies with classical semiconductor heterostructures. ,, Progress on the understanding of their electronic structures − was strongly connected to detailed experimental investigations of their excitonic properties. Moreover, D. Mitzi and co-workers obtained important conceptual advances, developing a technological approach for tin-based layered halide perovskites leading to the demonstration of transistor devices and to impressive anisotropic carrier transport properties. − Researchers from Greece ,,,,,− and Japan ,,,,− ,,− were the other most important contributors to the field at its early stage. The vast majority of the studies on low dimension halide perovskite structures were initially dedicated to monolayered systems such as A′ 2 BX 4 compounds (where A′ is typically an extended nonconjugated primary ammonium cation, R-NH 3 + ).…”

Section: Introductionmentioning

confidence: 99%

Quantum and Dielectric Confinement Effects in Lower-Dimensional Hybrid Perovskite Semiconductors

2019

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A c c e p t e d M a n u s c r i p t octahedra linked together either by Pb 2+ ions (blue octahedra), in (PPA)Pb 2 I 7 (PPA + = phenylpropylammonium) (left) and (PBA)Pb 2 I 7 (PBA + = phenylbutylammonium) (middle), or through edge-sharing mode in (H 2 Aepz) 3 Pb 4 I 14 (Aepz = 2-(2-aminoethyl)-pyrazole) (right). Adjacent ribbons appear as light pink octahedra and pink octahedra. 2.2. Formation of perovskite networks / choice of organic cations 2.2.1. (EDBE : 2,2'-(ethylenedioxy)bis(ethylammonium)) (c) and (H 2 D2c) 2 Pb 2 Br 8 (H2D2c : N-methylethane-1,2diammonium) (d) showing the hydrogen bonding at the organic-inorganic interface. 2.3. Multilayered <100>-oriented perovskites 2.3.1.

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Excitonic Bands in the Spectra of Some Organic-Inorganic Hybrid Compounds Based on Metal Halide Units

Abstract: Summary. The optical absorption, photoluminescence, and photoconductivity spectra of some compounds of the formulas [R(CH2)nNH3IxMyXz, [R(CH2)nNH(CH3hlxMyXz, [R(CH2)nS(CH3hlxMyXz' [R(CH2)nSC(NH2hlxMyXz, and [R(CH2)

Cited by 8 publications

References 13 publications

Energy transfer yellow light emitting diodes based on blends of quasi-2D perovskites

Energy transfer yellow light emitting diodes based on blends of quasi-2D perovskites

Trimethylsulfonium Lead Triiodide: An Air-Stable Hybrid Halide Perovskite

Quantum and Dielectric Confinement Effects in Lower-Dimensional Hybrid Perovskite Semiconductors

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