Stretchable Organometal‐Halide‐Perovskite Quantum‐Dot Light‐Emitting Diodes

Li, Yunfei; Chou, Shu-Yu; Huang, Peng; Xiao, Changtao; Liu, Xiaofeng; Xie, Yongchun; Zhao, Fangchao; Huang, Yongjun; Feng, Jing; Zhong, Haizheng; Sun, Hong‐Bo; Pei, Qibing

doi:10.1002/adma.201807516

Cited by 100 publications

(103 citation statements)

References 44 publications

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“…[1][2][3][4][5] Showing high photoluminescence (PL) quantum yields (QYs), 6,7 an optimal range of band gap energy values and high defect tolerance, [8][9][10][11] the perovskite nanomaterials hold great promise for solar cell, 12 photodetector, 13 laser, 14,15 light-emitting diode (LED) and display applications. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] Being free from the organic component, the all inorganic CsPbX 3 (X À stands for halide ions) perovskites are compositionally stable up to their melting points which are in excess of 460 C, 31 and thus have attracted enormous interest.…”

Section: Introductionmentioning

confidence: 99%

Methanol-induced fast CsBr release results in phase-pure CsPbBr₃ perovskite nanoplatelets

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Methanol-induced fast CsBr release results in phase-pure CsPbBr₃ perovskite nanoplatelets

et al. 2020

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“…Nevertheless, a liquid EInGa cathode is incapable to be adopted in practical applications. To address this issue, a mechanically, thermally, and chemically stable composite electrode with AgNWs inlaid in the surface of PI substrate was introduced by Pei et al With the precursor concentration and spin speed subjected to control, the thickness of the spin‐coated electrode films can be manipulated into 1–2 µm with ultrasmooth (RMS of 0.796 nm) and highly conductive (a sheet resistance of ≈10 Ω sq −1 ). Besides, this composite feature high transmittances of over 80% at 550 nm.…”

Section: Progresses Of Highly Efficient Flexible Displaysmentioning

confidence: 99%

Emerging Self‐Emissive Technologies for Flexible Displays

2019

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in the connection between software and hardware and function as the direct information transfer windows, have improved substantially since their invention. [4] Actually, as one representative technology, flexible active-matrix organic light-emitting diodes (flex-AMOLEDs) have been made a huge success in commercialization due to the popularization of high-resolution TVs, smartphones, and solid state illuminations. As shown by IHS Markit, the shipments of flex-AMOLED displays are expected to surge to as many as 335.7 million units by 2020 as the demand for such panels continues a strong growth, which accounts for as high as 52.0% of total AMOLED panel shipments and this value reached 38.9% in 2018. [5] The promising prospect faced by flexible displays in the market serves as a testament to their great potential in the future.From a technical perspective, for ideal flexible displays, a number of parameters ought to be satisfied at the same time, including self-emissive characters, excellent mechanical flexibility, low powerconsumption, long-term stability, compatibility with solution processing as well as low cost for mass production, as shown in Figure 1. At present, depending on the emitting-active materials, which define the emission qualities and characteristics of the devices, the self-emissive flexible displays can be categorized into flexible organic light-emitting diodes (flex-OLEDs), flexible quantum dot light-emitting diodes (flex-QLEDs) and flexible perovskite light-emitting diodes (flex-PeLEDs). Derived from the loose van der Waals bonds between organic molecules, excellent mechanical flexibilities have been regarded as one of the intrinsic properties required for organic materials. Thus, in 1992, the first full flexible self-emissive device was created by fabricating a polymer OLED on a poly(ethylene terephthalate) (PET) substrate, which opened up a brand-new era for future displays. [6] From that point on, thanks to the emergence of the phosphorescent emitters and the recently reported thermally activated delayed fluorescence (TADF) emitters as well as the fast-paced advancement of device structure design and manufacturing techniques, both the theoretical and experimental maximum efficiencies of flex-OLEDs have improved considerably, which finally contributes to the success in commercialization of this technology. [7,8] Regarding flex-QLEDs, despite their superiority in high efficiency, low cost, solution-process compatibility and high color-purity, the progress of such devices is significantly slower as compared Featuring a combination of ultrathin and lightweight properties, excellent mechanical flexibility, low power-consumption, and widely tunable saturated emission, flexible displays have opened up a new possibility for optoelectronics. The demands for flexible displays are growing on a continual basis due not only to their successful commercialization but, more importantly, their endless possibilities for wearable integrated systems. Up to now, self-emissive technologies for displays, flexible ac...

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“…Another structural design is to form a wavy buckling/wrinkle structure in the active pixels of thin‐film‐based LEDs (TFLED). [ 11–20 ] Using this method, the pixel itself appears to be stretched, similar to intrinsically stretchable LEDs, so that the display resolution can be increased without the loss of area occupied by interconnects. For wrinkled structure, TFLEDs are fabricated on an ultrathin plastic film (e.g., polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI)) with a thickness of under tens of micrometers, and the entire device including the plastic film is transferred to the prestretched elastomer by laminating the peeled‐off freestanding device.…”

Section: Figurementioning

confidence: 99%

Distortion‐Free Stretchable Light‐Emitting Diodes via Imperceptible Microwrinkles

Jeong

Yoon

Lee

et al. 2020

Adv Materials Technologies

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Stretchable organic light‐emitting diodes (OLEDs) have been considered as a promising technology for next‐generation free‐form and wearable displays. However, an approach to ensure both high device performance and high resolution has not yet been suggested. While introducing a wrinkled structure in the active pixel areas is a decent method, the formation of out‐of‐plane macroscopic wrinkles having a wavelength of a few hundred µm has caused distortion in the shape of the pixel, which is a critical drawback for a matrix‐configured display demanding a sharp pixel definition. Herein, microwrinkled OLEDs are fabricated to define a distortion‐free pixel by direct deposition of OLEDs on biaxially prestretched elastomeric substrate, being feasible by a low‐temperature‐based solution process. The total thickness of the device can be significantly reduced up to 350 nm, producing the imperceptible microwrinkles having a wavelength under 20 µm. The microwrinkled OLEDs show a luminance over 8000 cd m−2 and maximum current efficiency of 7.76 cd A−1, which is comparable to the device without wrinkled structure. Finally, a stretchable 4 × 4 OLED pixel array with a microwrinkled structure is demonstrated showing sharply defined square‐patterned emission, proving the potential in the future high‐resolution stretchable display.

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Stretchable Organometal‐Halide‐Perovskite Quantum‐Dot Light‐Emitting Diodes

Cited by 100 publications

References 44 publications

Methanol-induced fast CsBr release results in phase-pure CsPbBr₃ perovskite nanoplatelets

Methanol-induced fast CsBr release results in phase-pure CsPbBr₃ perovskite nanoplatelets

Emerging Self‐Emissive Technologies for Flexible Displays

Distortion‐Free Stretchable Light‐Emitting Diodes via Imperceptible Microwrinkles

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Stretchable Organometal‐Halide‐Perovskite Quantum‐Dot Light‐Emitting Diodes

Cited by 100 publications

References 44 publications

Methanol-induced fast CsBr release results in phase-pure CsPbBr3 perovskite nanoplatelets

Methanol-induced fast CsBr release results in phase-pure CsPbBr3 perovskite nanoplatelets

Emerging Self‐Emissive Technologies for Flexible Displays

Distortion‐Free Stretchable Light‐Emitting Diodes via Imperceptible Microwrinkles

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Product

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Methanol-induced fast CsBr release results in phase-pure CsPbBr₃ perovskite nanoplatelets

Methanol-induced fast CsBr release results in phase-pure CsPbBr₃ perovskite nanoplatelets