Growth of Nanosized Single Crystals for Efficient Perovskite Light-Emitting Diodes

Lee, Seungjin; Park, Jong Hyun; Nam, Yun Seok; Lee, Bo Ram; Zhao, Baodan; Nuzzo, Daniele Di; Jung, Eui Dae; Jeon, Hansol; Kim, Ju‐Young; Jeong, Hu Young; Friend, Richard H.; Song, Myoung Hoon

doi:10.1021/acsnano.7b09148

Cited by 111 publications

(101 citation statements)

References 31 publications

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“…Another way to passivate grain boundary defects is to add passivation agents into anti-solvents [119,120]. Anti-solvent dripping is a commonly used technique to fabricate smooth and pin-hole free perovskite films [20].…”

Section: Suppressing Grain Boundary Ion Migrationmentioning

confidence: 99%

“…Anti-solvent dripping is a commonly used technique to fabricate smooth and pin-hole free perovskite films [20]. By adding phenylmethylamine (PMA) into chlorobenzene (CB) antisolvent which is drop-casted onto a precursor coated substrate during spin coating, the operational lifetime of the resulting device has been improved significantly to 135 min compared with the device without PMA which has a lifetime of 22 min ( figure 6(d)) [119]. Moreover, EL-blinking was not observed in the PMA-passivated devices indicating a suppressed charge trapping and ion migration [119].…”

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: 99%

Section: Suppressing Grain Boundary Ion Migrationmentioning

confidence: 99%

Operational stability of perovskite light emitting diodes

et al. 2020

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“…This material exhibits strong exciton behavior. There are many options for organic ligands such as phenylethylammonium (PEA), 148 butylammonium, 149 ethylammonium, 150 phenylmethylamine, 151 phenylbutylammonium, 152 naphthylmethylamine, 153 and 2-phenoxyethylamine. 154 Both the blend spin coating and the controlled drying belong to the in situ preparation in the polymer matrix, which utilizes a method of directly mixing the polymer with the precursor solution or a tape casting method in the industry, and the latter utilizes controllable evaporation of DMF to separate the crystallization process of polyvinylidene fluoride matrix and perovskite QDs ( Figure 6D,E).…”

Section: Other Methodsmentioning

confidence: 99%

“…This material exhibits strong exciton behavior. There are many options for organic ligands such as phenylethylammonium (PEA), butylammonium, ethylammonium, phenylmethylamine, phenylbutylammonium, naphthylmethylamine, and 2‐phenoxyethylamine …”

Section: Synthesis Of Perovskite Ncsmentioning

confidence: 99%

Metal halide perovskite nanocrystals and their applications in optoelectronic devices

Wang

et al. 2019

InfoMat

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In recent years, metal halide perovskite nanocrystals (NCs) have been favored by many researchers due to their unique properties including long carrier diffusion length, high carrier mobility, tunable emission wavelength, and narrow full width at half maximum, making them great application potentials in optoelectronic devices. The photoluminescence quantum yields of perovskite NCs are nearly 100%, and the device efficiency of perovskite NC‐based light‐emitting diodes (LEDs) has been improved significantly from below 0.1% to over 20%. In addition, perovskite NC‐based solar cells and photodetectors have also developed rapidly in recent years. Here, we summarize the synthesis and the basic optoelectronic properties of metal halide perovskite NCs and introduce their applications in LEDs, solar cells, and photodetectors.

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“…As mentioned above, the quasi 2D PNC structure can be denoted as L 2 A n−1 B n X 3n+1 . Plenty of investigations have been conducted on the choices of bulky cation L, including PEA, [56,63,64,[89][90][91][92] BA, [55,88,[93][94][95] ethylammonium (EA), [96] phenylmethylamine (PMA), [97] phenylbutylammonium (PBA), [98,99] naphthylmethylamine (NMA) [65,100] and 2-Phenoxyethylamine (POEA). [101] Similar to the pure 2D structure, with the space dimension reduced to nanosized 3D or quasi 2D, the PNCs exhibit strong excitonic behavior.…”

Section: Organic Ammonium Assisted In Situ Fabricationmentioning

confidence: 99%

In Situ Fabricated Perovskite Nanocrystals: A Revolution in Optical Materials

Chang

Bai

Zhong

2018

Advanced Optical Materials

181

124

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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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Growth of Nanosized Single Crystals for Efficient Perovskite Light-Emitting Diodes

Cited by 111 publications

References 31 publications

Operational stability of perovskite light emitting diodes

Operational stability of perovskite light emitting diodes

Metal halide perovskite nanocrystals and their applications in optoelectronic devices

In Situ Fabricated Perovskite Nanocrystals: A Revolution in Optical Materials

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