Incorporation of zinc ions towards low toxicity and high stability of organic-inorganic methyl ammonium lead bromide perovskite QDs via ultrasonication route for white-LEDs

Singh, Rajan Kumar; Sharma, Pushkal; Lu, Chung‐Hsin; Som, Sudipta; Dutta, Somrita; Jain, Neha; Singh, Jai; Chen, Teng‐Ming

doi:10.1016/j.molliq.2021.116557

Cited by 13 publications

(6 citation statements)

References 38 publications

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“…The particle size reduction can be attributed to the decrease of Pb 2+ ion concentration in the precursor and the passivation of the structural defects by Zn 2+ ions introduced into the NC surface. 37 The HRTEM images in Fig. 1a and b show the same lattice spacing of ∼0.30 nm, which is consistent with the (200) crystal plane of the monoclinic phase perovskite, indicating that Zn doping does not affect the core PEA 2 CsPb 2 Br 7 NCs.…”

Section: Resultssupporting

confidence: 71%

“…4c), which can be attributed to the weak quantum confinement effect associated with the reduced particle size. 37 The broadening of full width at half maximum (FWHM) with Zn doping is associated with the wide particle size distribution. In addition, a minor emission peak ( n = 2) was observed at 433 nm, and an additional PL peak ( n = 3) appears at 459 nm, and its contribution gradually increases with further increasing the Zn loading ratio to 30%.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, Chen et al developed an ultrasonication method for the synthesis of Zn-doped 3D MAPbBr 3 perovskite NCs with a high PLQY at a relatively low temperature. 37 Hanna et al reported the incorporation of Zn 2+ into CsPbBr 3 NCs prepared by ligand-assisted reprecipitation (LARP). 38 Moreover, some research studies demonstrated that Zn 2+ can improve the PL performance by passivating Pb and halogen vacancy defects.…”

Section: Introductionmentioning

confidence: 99%

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Improved exciton photoluminescence of Zn-doped quasi-2D perovskite nanocrystals and their application as luminescent materials in light-emitting devices

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Section: Resultssupporting

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improved exciton photoluminescence of Zn-doped quasi-2D perovskite nanocrystals and their application as luminescent materials in light-emitting devices

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“…With the incorporation of CoCl 2 and SnCl 2 into MAPbBr 3 PQDs, the optical bandgap continuously increases and the bright green color changed into the canyon because of the lower ionic radii of CoCl 2 and SnCl 2 than PbBr 2 (Singh et al, 2020). For the lead-less PQDs based backlight, our group reported the color gamut up to 138% for the Co-doped and 124% of the standard NTSC for the Zn-doped PQDs (see Figure 15E) (Singh et al, 2021b). Currently, our group is developing an easy method to manufacture CH 3 NH 3 Pb 1x Mn x I 3 (x = 0 to .60M) PQDs under room temperature that minimizes environmental toxic waste and makes it commercially viable (Singh et al, 2019).…”

Section: Perovskite Quantum Dots In Backlight Display Applicationmentioning

confidence: 95%

“…FIGURE 15 | Different Pb-less PQD-based backlight LEDs, (A) MAPb 1-x Co x (Br/Cl) 3 (x = 0-0.50) PQD structure, and its change in color from green to cyan with CoCl 2 incorporation into MAPbBr 3 (Singh et al, 2021a), (B) MAPb 1-x Sn x (Br/Cl) 3 (x = 0-0.50) PQD energy band diagram (Singh et al, 2020), (C,D) MAPb 1-x Mn x I 3 PQD colloidal solutions under UV light and energy band diagram(Singh et al, 2019), (E) white LED full spectra of MAPb 1-x Zn x Br 3 (x = 0-0.50) PQD(Singh et al, 2021b), and (F-H) MAPb1-xMnxI 3 (x = 0-0.60)PQD-based red LEDs, full-color emitter, CIE spectra, and CRI, and CCT value of the PQD-based backlight light convertor(Singh et al, 2019).…”

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confidence: 99%

Progress of Backlight Devices: Emergence of Halide Perovskite Quantum Dots/Nanomaterials

Singh

Chen

Singh

et al. 2022

Front. Nanotechnol.

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The technology behind the display is becoming ever more prevalent in our daily lives. It has many applications, including smartphones, tablets, desktop monitors, TVs, and augmented reality/virtual reality devices. The display technology has progressed drastically over the past decade, from the bulky cathode ray tube to the flat panel displays. In the flat panel displays, the liquid crystal display (LCD) and organic light-emitting diodes (OLEDs) are the two dominant technologies. Nevertheless, due to low stability and color tunability, OLEDs remain behind the LCDs. The LCD screen has a backlight, usually a white LED, which comprises a blue LED covered with a red and green enhanced layer (color-converting layers). Although InP/CdSe QDs attracted more attention due to their solution processability and better color gamut than the previous technologies, the complexity of their synthesis was still an obstacle to their commercialization. Later, the emergence of perovskite with highly intense and tunable PL emission, high color purity, and low-cost synthesis route attracted the attention of display researchers. Owing to the relatively higher performance of perovskite quantum dots (PQDs) than that of bulk (3D) perovskite in backlit display devices, these PQDs are being used for high color contrast and bright display devices. Furthermore, the color gamut for PQDs was observed as 140% of the NTSC standard, that is, close to that of the commercial OLED devices. In this review, we have discussed the progress of display technologies with a clear classification of the pros and cons of each technology. Also, the application of perovskite QD/nanomaterials in LCD backlit devices has been discussed, and the future direction of further improvement in their stability and performance has been listed.

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Doping Strategies for Promising Organic–Inorganic Halide Perovskites

Jin

Lou

Wang

2023

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up, but their weaknesses (bad stability and low efficiency) are obvious although it is expected as a promising candidate to address the toxicity of lead. [33] There are at least four main issues to be solved: i) The poor stability due to the oxidation of Sn 2+ in a low water and oxygen environment.ii) The low formation energy of Sn vacancies. iii) The fast formation rate of perovskite leads to poor film formation quality. iv) The mismatch of energy levels between SOIHP layer and the charge transport layer results in the charge transport barrier. [34] Therefore, it is urgent to resolve these problems in the POIHPs and SOIHPs to improve their performance, promoting the commercial application of perovskites in many fields. In order to address the issues aforementioned, compositional engineering plays a key role in achieving highly efficient and stable OIHPs. Notably, the modification of properties through ion doping is an effective way to improve the performance and broaden the application field of OIHPs in recent years, [1,[35][36][37][38][39][40] involving solar cells, light-emitting diodes, transistors, and so on. [1,4,6,41] In order to better understand doping, it is important to study the structural characteristics of perovskites. There are two main kinds of perovskites 3D and 2D perovskites, which were extensively explored in recent years. The typical 3D structure can be expressed as ABX 3 , where A is an organic cation such as CH 3 NH 3 + (MA), (NH 2 ) 2 CH + (FA), and Cs + ; B is a divalent cation such as Pb 2+ and Sn 2+ (we only mentioned in this article); X is halogen anions such as Cl − , Br − , and I − , respectively. The 2D perovskites can be categorized as Ruddlesden-Popper phase (RPP) A' 2 A n-1 B n X 3n+1 with 1 ≤ n < ∞, Dion-Jacobson phase (DJP) A''A n-1 B n X 3n+1 with 1 ≤ n < ∞, and alternating cations in the interlayer phase (ACIP) A'''A n B n X 3n+1 , where the A', A'' and A''' are an organic spacer cation such as aromatic or aliphatic alkylammonium monovalent cations; diamine compounds with two amino groups forming hydrogen bonds on both ends with the inorganic "quantum wells" (bivalent cations), and guanidine (GA), respectively. [1,[42][43][44] There are also lower-dimension (LD) perovskites such as 1D and 0D. [45][46][47] The ions doping can occur at the A, B, and X sites, or simultaneously happen at these sites. The doping that we mentioned in perovskite may differ from other semiconductors where it refers to a very small concentration of element addition, while our "doping" refers to a large amount of element addition which is more like an alloy or so. With the different doping strategies, the properties of POIHP and SOIHP can be effectively controlled or modified. The relationship between the

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Incorporation of zinc ions towards low toxicity and high stability of organic-inorganic methyl ammonium lead bromide perovskite QDs via ultrasonication route for white-LEDs

Cited by 13 publications

References 38 publications

Improved exciton photoluminescence of Zn-doped quasi-2D perovskite nanocrystals and their application as luminescent materials in light-emitting devices

Improved exciton photoluminescence of Zn-doped quasi-2D perovskite nanocrystals and their application as luminescent materials in light-emitting devices

Progress of Backlight Devices: Emergence of Halide Perovskite Quantum Dots/Nanomaterials

Doping Strategies for Promising Organic–Inorganic Halide Perovskites

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