The Stability of Metal Halide Perovskite Nanocrystals—A Key Issue for the Application on Quantum-Dot-Based Micro Light-Emitting Diodes Display

Shangguan, Zhibin; Zheng, Xi; Zhang, Jing; Lin, Wansheng; Guo, Weijie; Li, Cheng; Wu, Tingzhu; Lin, Yue; Zhong, Chen

doi:10.3390/nano10071375

Cited by 43 publications

(24 citation statements)

References 86 publications

(121 reference statements)

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“…The defect acts as an electron trap on the crystal surface and the trap's photocarriers, forming a local trap state. With the extension of illumination time, the density of the trap gradually increases, which further disrupts the crystal structure and generates an electric field, further intensifying the coupling between carriers and lattice, ultimately leading to lattice distortion and structural degradation of perovskite [21]. Gd 2 O 3 :Eu red phosphor is a kind of phosphor in essence, which is superior to the perovskite quantum dot in stability.…”

Section: Resultsmentioning

confidence: 99%

Study of Construction and Performance on Photoelectric Devices of Cs–Pb–Br Perovskite Quantum Dot

Lu²,

Wang

et al. 2021

Materials

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White LEDs were encapsulated using Cs4PbBr6 quantum dots and Gd2O3:Eu red phosphor as lamp powder. Under the excitation of a GaN chip, the color coordinates of the W-LED were (0.33, 0.34), and the color temperature was 5752 K, which is close to the color coordinate and color temperature range of standard sunlight. The electric current stability was excellent with an increase in the electric current, voltage, and luminescence intensity of the quantum dots and phosphors by more than 10 times. However, the stability of the quantum dots was slightly insufficient over long working periods. The photocatalytic devices were constructed using TiO2, CsPbBr3, and NiO as an electron transport layer, light absorption layer, and catalyst, respectively. The Cs–Pb–Br-based perovskite quantum dot photocatalytic devices were constructed using a two-step spin coating method, one-step spin coating method, and full PLD technology. In order to improve the water stability of the device, a hydrophobic carbon paste and carbon film were selected as the hole transport layer. The TiO2 layer and perovskite layer with different thicknesses and film forming qualities were obtained by changing the spin coating speed. The influence of the spin coating speed on the device’s performance was explored through SEM and a J–V curve to find the best spin coating process. The device constructed by the two-step spin coating method had a higher current density but no obvious increase in the current density under light, while the other two methods could obtain a more obvious light response, but the current density was very low.

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Section: Resultsmentioning

confidence: 99%

Study of Construction and Performance on Photoelectric Devices of Cs–Pb–Br Perovskite Quantum Dot

Lu²,

Wang

et al. 2021

Materials

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“…When the QDs are excited by electricity or light, they can emit light with different wavelengths related to their size, shape, and composition. In this way, the emission wavelength can be adjusted by changing these parameters, which can be used to realize a full-color display with micro-LEDs [ 59 , 60 , 61 , 62 , 63 , 64 , 65 ]. QDs are usually II-VI group compounds, III-V group compounds, or I-III-VI compounds, such as CdSe, InP, and CuInS 2 [ 66 ].…”

Section: Color Conversion Technologymentioning

confidence: 99%

Full-Color Realization of Micro-LED Displays

et al. 2020

Nanomaterials

150

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Emerging technologies, such as smart wearable devices, augmented reality (AR)/virtual reality (VR) displays, and naked-eye 3D projection, have gradually entered our lives, accompanied by an urgent market demand for high-end display technologies. Ultra-high-resolution displays, flexible displays, and transparent displays are all important types of future display technology, and traditional display technology cannot meet the relevant requirements. Micro-light-emitting diodes (micro-LEDs), which have the advantages of a high contrast, a short response time, a wide color gamut, low power consumption, and a long life, are expected to replace traditional liquid-crystal displays (LCD) and organic light-emitting diodes (OLED) screens and become the leaders in the next generation of display technology. However, there are two major obstacles to moving micro-LEDs from the laboratory to the commercial market. One is improving the yield rate and reducing the cost of the mass transfer of micro-LEDs, and the other is realizing a full-color display using micro-LED chips. This review will outline the three main methods for applying current micro-LED full-color displays, red, green, and blue (RGB) three-color micro-LED transfer technology, color conversion technology, and single-chip multi-color growth technology, to summarize present-day micro-LED full-color display technologies and help guide the follow-up research.

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“…The charge injection and balance play a crucial role in the performance of LEDs. In particular, inefficient charge injection caused by interface barriers and/or ligands will easily result in Joule heat while poor charge balance will lead to charging emitters or Auger recombination, which deteriorates the device stability [196][197][198][199][200]. To resolve the issues of charge injection and balance in PeLEDs, the innovation of device engineering is essential.…”

Section: Balancing Charge Injectionmentioning

confidence: 99%

Advances in Perovskite Light-Emitting Diodes Possessing Improved Lifetime

Xiao

Cheng

et al. 2021

Nanomaterials

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Recently, perovskite light-emitting diodes (PeLEDs) are seeing an increasing academic and industrial interest with a potential for a broad range of technologies including display, lighting, and signaling. The maximum external quantum efficiency of PeLEDs can overtake 20% nowadays, however, the lifetime of PeLEDs is still far from the demand of practical applications. In this review, state-of-the-art concepts to improve the lifetime of PeLEDs are comprehensively summarized from the perspective of the design of perovskite emitting materials, the innovation of device engineering, the manipulation of optical effects, and the introduction of advanced encapsulations. First, the fundamental concepts determining the lifetime of PeLEDs are presented. Then, the strategies to improve the lifetime of both organic-inorganic hybrid and all-inorganic PeLEDs are highlighted. Particularly, the approaches to manage optical effects and encapsulations for the improved lifetime, which are negligibly studied in PeLEDs, are discussed based on the related concepts of organic LEDs and Cd-based quantum-dot LEDs, which is beneficial to insightfully understand the lifetime of PeLEDs. At last, the challenges and opportunities to further enhance the lifetime of PeLEDs are introduced.

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The Stability of Metal Halide Perovskite Nanocrystals—A Key Issue for the Application on Quantum-Dot-Based Micro Light-Emitting Diodes Display

Cited by 43 publications

References 86 publications

Study of Construction and Performance on Photoelectric Devices of Cs–Pb–Br Perovskite Quantum Dot

Study of Construction and Performance on Photoelectric Devices of Cs–Pb–Br Perovskite Quantum Dot

Full-Color Realization of Micro-LED Displays

Advances in Perovskite Light-Emitting Diodes Possessing Improved Lifetime

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