Efficient Inorganic Perovskite Light-Emitting Diodes with Polyethylene Glycol Passivated Ultrathin CsPbBr<sub>3</sub> Films

Song, Li; Guo, Xiaoyang; Hu, Yong‐Sheng; Lv, Ying; Lin, Jie; Liu, Zheqin; Yi, Fan; Liu, Xingyuan

doi:10.1021/acs.jpclett.7b01733

Cited by 151 publications

(127 citation statements)

References 46 publications

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“…Adding passivation agents into perovskite precursors is one way to passivate grain boundary defects thus suppressing ion migrations [29,115,117]. By adding polyoxyethylene sorbitan monolaurate (Tween 20) into CsPbBr 3 perovskite precursor [115], the undercoordinated Pb at the grain boundaries can be passivated, as confirmed by Fourier transform infrared spectroscopy.…”

Section: Suppressing Grain Boundary Ion Migrationmentioning

confidence: 90%

“…Due to the suppressed nonradiative recombination and ion migration, the passivated perovskite LEDs showed an improved efficiency and operational stability. In addition, hydroxyl additives such as polyethylene glycol (PEG) [117], methoxypolyethylene glycol (mPEG) [118], and polyethylene oxide (PEO) [112,113] have also been added into perovskite precursors to improve the efficiency and the stability of perovskite LEDs. More recently, additives having a weaker hydrogen-bonding ability by introducing O atom is considered as an effective passivation agent, such as 2,2′-[oxybis (ethylenoxy)] diethylamine (ODEA) [116].…”

Section: Suppressing Grain Boundary Ion Migrationmentioning

confidence: 99%

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Operational stability of perovskite light emitting diodes

et al. 2020

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Organometal halide perovskite light emitting diodes (LEDs) have attracted a lot of attention in recent years, owing to the rapid progress in device efficiency. However, their short operational lifetime severely impedes the practical uses of these devices. The operating stability of perovskite LEDs are due to degradation due to ambient environment and degradation during operation. The former can be suppressed by encapsulation while the latter one is the intrinsic degradation due to the electrochemical stability of the perovskite materials. In addition, perovskites also suffer from ion migration which is a major degradation mechanism in perovskite LEDs. In this review, we specifically focus on the operational stability of perovskite LEDs. The review is divided into two parts: the first part contains a summary of various degradation mechanisms and some insight on the degradation behavior and the second part is the strategies how to improve the operational stability, especially the strategies to suppress ion migration. Based on the current advances in the literature, we finally present our perspectives to improve the device stability.

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Section: Suppressing Grain Boundary Ion Migrationmentioning

confidence: 90%

Section: Suppressing Grain Boundary Ion Migrationmentioning

confidence: 99%

Operational stability of perovskite light emitting diodes

et al. 2020

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“…As for the nonionic dielectric polymers, a maximum luminance of 36600 cd m −2 and CE of 19 cd A −1 is achieved for the ultrathin PEG-CsPbBr 3 nanocomposite film with a thickness of 30 nm [107] and near-infrared emissive PeLED was demonstrated using PEtOz-MAPbI 3 nanocomposite thin films. [68] It is also possible to blend the polymeric charge transporting materials such as polyvinyl carbazole (PVK) [134,135] into the perovskite films to control the film morphology and facilitate the charge transport.…”

Section: Electroluminescencementioning

confidence: 99%

“…[106] Such built-in p-i-n homojunction helps the hole/electron injection from the anode/cathode side and finally gives rise to a single layer structured LED without the use of charge injection layers. In an opposite approach, nonionic dielectric polymers such as poly(2-ethyl-2-oxazoline) (PEtOz) [68] or poly ethylene glycol (PEG) [107] were employed for the fabrication of PNC-polymer composite films. Here, the nonionic polymers mainly play the role of confining the grain sizes of the PNCs as well as passivating the defects at the grain boundaries, however, the composite films have to be thin enough to ensure efficient charge transport in the operation of EL devices.…”

Section: Blended Spin-coatingmentioning

confidence: 99%

In Situ Fabricated Perovskite Nanocrystals: A Revolution in Optical Materials

Chang

Bai

Zhong

2018

Advanced Optical Materials

188

127

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in bulk halide perovskites, long carrier diffusion length, and an absorption range covering the visible solar spectrum, collectively enable the high performance of photo electricity conversion. Compared to the bulk materials, perovskite nanocrystals or quantum dots (usually denoted as PNCs or PQDs) show obvious excitonic features with enhanced photoluminescence (PL) properties due to the well-known size-dependent quantum confinement effects. [14][15][16][17] The combination of color saturated emissions, super high quantum yield (QY), as well as easy processing inspired the intensive exploration of PNCs as light emitters, which is now under spotlights in the field of optical materials.The first perspective aim of PNCs is to alternate the state-of-the-art CdSe or InP quantum dots (QDs) as new generation luminescence materials. [18,19] As shown in Figure 1, these QD materials have been well demonstrated to be potential functional components for photonic and optoelectronic applications, and are currently on the way to industrialization. [20][21][22][23] Specifically, QDs can be employed as fluorescence labels, [24] laser gain media, [25] LED phosphors, [26] and down-shifting films for LCD backlights. [27,28] They can also be processed into thin film for optoelectronic devices including solar cells, [29] photodetectors, [30,31] transistors [32] and LEDs. [33] The PNCs outcompete these conventional QDs in terms of narrower full width at half maximum (FWHM) and low fabrication cost, but most importantly, the ease of in situ preparation. [34,35] Herein, this progress report highlight the developments of in situ fabricated PNCs.Colloidal semiconductor QDs are typically synthesized ex situ in flasks by hot injection method, stabilized by surface ligands. [36][37][38][39] To incorporate such solution based materials into applications usually requires purification, redispersion and surface engineering. For instance, ligand exchange is often employed to disperse QDs into aimed solvent, inducing defects that inevitably derogating the PLQYs. [40] Moreover, the organic ligands themselves also suffer from the risk of disabsorbing, reducing the stability of the QDs and thus the final devices. [41] Because halide perovskite are ionic compounds that can be well dissolved into polar solvents, PNCs can be fabricated through either ex situ routes in flask or in situ strategies on substrates. The in situ fabricated PNCs are adaptable to devices integration due to their scalable and low-cost manufacturing. In this regard, more and more efforts have been made in terms of the controlling synthesis, physical properties and device applications of PNC materials.After over 30 years of development, colloidal quantum dots have now become mature luminescent materials in photonic and optoelectronic operations and start to hit the market. The emerging perovskite nanocrystals are expected to promote large-scale commercialization due to their superior optical properties as well as low cost and easy fabrication. This progress report is focused on the...

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“…Furthermore, CsPbX 3 (X = Cl, Br, I)‐based pure inorganic system reveals excellent thermal stability and high PLQY. The excess of CsBr or polymer addition in CsPbBr 3 precursors significantly reduces the trap density and thus leads improved PeLED performance …”

Section: From 3d Perovskite To Perovskite Nanoparticle Peledsmentioning

confidence: 99%

Perovskite Nanoparticles: Synthesis, Properties, and Novel Applications in Photovoltaics and LEDs

et al. 2018

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Solar cells and light‐emitting diodes (LEDs) based on metal‐halide perovskites are transitioning from promising performers to direct competitors to well‐established technologies, with cost‐effectiveness as a strong advantage. Nanostructured perovskites have yielded record LEDs due to their higher versatility in the local management of charge carriers, which has enabled photoluminescence quantum yields (PLQYs) close to 100%. However, these perovskite nanostructures are yet to be fully exploited in other applications such as photovoltaics, where they can also present competitive advantages as they enable feasible routes to surpass the Shockley–Queisser limit by means of multiexciton generation or hot‐carrier extraction. Besides conventional applications, the extraordinary properties of these materials have the potential to unlock novel areas of research. Herein, the potential of perovskite nanostructures—with the focus on the widely developed nanoparticles—beyond classical thin‐film optoelectronics is analyzed, their limits of application are discussed, and their real possibilities are pondered.

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Efficient Inorganic Perovskite Light-Emitting Diodes with Polyethylene Glycol Passivated Ultrathin CsPbBr₃ Films

Cited by 151 publications

References 46 publications

Operational stability of perovskite light emitting diodes

Operational stability of perovskite light emitting diodes

In Situ Fabricated Perovskite Nanocrystals: A Revolution in Optical Materials

Perovskite Nanoparticles: Synthesis, Properties, and Novel Applications in Photovoltaics and LEDs

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Efficient Inorganic Perovskite Light-Emitting Diodes with Polyethylene Glycol Passivated Ultrathin CsPbBr3 Films

Cited by 151 publications

References 46 publications

Operational stability of perovskite light emitting diodes

Operational stability of perovskite light emitting diodes

In Situ Fabricated Perovskite Nanocrystals: A Revolution in Optical Materials

Perovskite Nanoparticles: Synthesis, Properties, and Novel Applications in Photovoltaics and LEDs

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Efficient Inorganic Perovskite Light-Emitting Diodes with Polyethylene Glycol Passivated Ultrathin CsPbBr₃ Films