Blue Perovskite Nanocrystal Light‐Emitting Devices via the Ligand Exchange with Adamantane Diamine

Chiba, Takayuki; Ishikawa, Shota; Sato, Jun; Takahashi, Yūzō; Ebe, Hinako; Kido, Junji

doi:10.1002/adom.202000289

Cited by 58 publications

(40 citation statements)

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“…have been widely developed for various high-performance optoelectronic devices due to their remarkable photoelectric properties [1][2][3] and impressive low-cost solution-phase synthesis process. [4,5] Most representative, the photoelectric conversion efficiency (PCE) of solar cells has achieved from 3.8% [6] to more than 25% [7][8][9] in one decade and the external quantum efficiency of perovskite light-emitting diodes (LED) exceeded over 20% [10][11][12] (for red and green LEDs). It is also worth noting that HOIP materials have also outstanding performances in nanolasers, detectors, and nonlinear fields.…”

Section: Introductionmentioning

confidence: 99%

Stability Improvement of 2D Perovskite by Fluorinated‐Insulator

Zhuang

Shi

et al. 2021

Adv Materials Inter

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much attention due to excitonic property in physics and devices. [18] Stability is the largest obstacle to hinder further development of HOIP materials and devices. [19][20][21] The soft-lattice nature of perovskite directly contributes to the excellent performances of the material by the large high-density defects toleration, [22] however, becomes a serious reason of degradation in turn. The degradation could be caused by internal factors, for example, lattice strain, [23] atomic vacancies, etc., [24] and also could be by external factors, such as light-illumination, [25,26] temperature, [27,28] humidity, [29,30] oxygen in ambient condition, etc. Considerable efforts are focusing on the internal factors of degradation from view of molecule design, for example, doping [23] and lattice-anchoring [31] to release internal strain, ligands engineering [24,32,33] for surface passivation, interfacial engineering to enhance moisture stability, [34] and even redox strategy [35] to recover materials. For external factors, an intuitive strategy is physically isolating perovskites from ambient environments, such as encapsulation with polymers, [36] silica, [37,38] or low penetrative 2D shields [39] such as graphene [40] and hexagonal boron nitride, etc. [41] Although the stability of 2D perovskite possesses some advantages in comparison with that of 3D counterpart due to the hydrophobic nature of organic ligands, there is an obvious yawning gap to commercial requirements. To date, the protocols were limited to improve the stability of 2D perovskites, such as deposition strategy to reduce crystal defects for optical stability, insulator selection for better hydrophobicity, [42] composite strategy with other monolayer materials, [40,41] supramolecular engineering, and so on. [43] It is known that carbon-fluorine is the strongest bond in organic chemistry. [44] The high polarity of carbon-fluorine directly affects the interfacial properties, chemical activity, dielectric constant, surface tension, and so on. One of the results is the hydrophobic interface, which can prevent the adsorption of water molecules on the surface. Additionally, they can passivate surfaces and serve as physiochemical barriers to reactive infiltrating species. In fact, some fluorinated organic compounds have been reported as surface passivation agent to improve the performances of perovskites. [45][46][47] However, researches about stabilizing optical properties by directly utilizing fluorinated organic-ligand as a 2D-HOIP insulating layer are rare. [48,49] In this work, in order to enhance the stabilities of 2D-HOIP, fluorinated cation (2-(4-fluorophenyl) ethylamine [F-PEA]) was chosen as the organic ligand to replace the phenyl ethylamine (PEA) in (PEA) 2 PbI 4 (PEPI), as the schematic diagram shown In this study, the interface of 2D hybrid organic-inorganic perovskites L 2 PbI 4 (here L stands for phenylethylamine, PEA) is engineered by fluorine substitution in its organic insulator layers, and the stability of the perovskite is investigated. For the ...

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Section: Introductionmentioning

confidence: 99%

Stability Improvement of 2D Perovskite by Fluorinated‐Insulator

Zhuang

Shi

et al. 2021

Adv Materials Inter

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“…Currently, research progress on blue-emitting perovskite halide NCs is lagging behind that of green and red emitting perovskite halide NCs due to instability and low PLQY. [14][15][16] In particular, the replacement of the Pb cation in blue-emitting perovskite NCs to lower toxicity has sacriced their PLQY signicantly. 17 Hence, developing non-toxic lead-free blue-emitting NCs with high PLQY becomes an important task.…”

Section: Introductionmentioning

confidence: 99%

Lead-free bright blue light-emitting cesium halide nanocrystals by zinc doping

Liang

Zhang

et al. 2021

RSC Adv.

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“…Generally, researchers obtain mixed-halide PQDs through a feed ratio modulation of halide precursors or an anion exchange post-treatment. [107][108][109] In contrast to fixing halogen composition in precursors, it is simpler and more efficient to reconstruct the halogen constituents by anion exchange at room temperature. Bi and co-workers prepared single-halogen stock solution of CsPbX 3 PQDs (CsPbCl 3 , CsPbBr 3 ) and then the monodispersed CsPb(Cl/Br) 3 PQDs were obtained by mixing the stock solution with a controllable ratio.…”

Section: Mixed-halide Pqdsmentioning

confidence: 99%