Frontiers in Green Perovskite Light‐Emitting Diodes

Yu, Runnan; Li, Changxiao; Zhao, Biao; Tan, Zhan'ao

doi:10.1002/lpor.202300780

Cited by 3 publications

References 188 publications

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Constructing Multi‐Functional Polymeric‐Termination Surface Enables High‐Performance Flexible Perovskite LEDs

Liu,

Zhang,

Sun

et al. 2024

Adv Funct Materials

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Flexible perovskite light‐emitting diodes (f‐PeLEDs) have attracted increasing interest to realize true‐color, low‐cost, and light‐weight wearable optoelectronic and flexible display applications. However, their external quantum efficiency (EQE) and mechanical stability lag far behind because of the inherent surface and brittle issues of polycrystalline perovskite films. In this work, a multi‐functional polymeric‐termination surface of perovskite film is constructed for achieving efficient and mechanically stable f‐PeLEDs. It takes the roles to not only reduce defects through equipping coordination groups to improve emission properties, but also optimize film morphology and eliminate pinholes to solve the long‐standing issue of leakage current. Meanwhile, the polymeric‐termination surface with anchoring points and polymeric soft chains on perovskites demonstrates synergetic effects beyond the corresponding functional group‐only or polymer‐only strategies in reducing the Young's modulus and improving the mechanical flexibility. Ultimately, the record EQE of 22.1% and significantly enhanced mechanical stability of maintaining 82% of the initial performance after 2000 bending cycles with radius of 5 mm are achieved in pure‐green f‐PeLEDs. The work paves the way for the development of high‐performance flexible optoelectronic devices.

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Constructing Multi‐Functional Polymeric‐Termination Surface Enables High‐Performance Flexible Perovskite LEDs

Liu,

Zhang,

Sun

et al. 2024

Adv Funct Materials

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Halide perovskite and polymer composite film for bright light emitting devices

Cheng,

Robinson,

Shah

et al. 2024

Preprint

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Stability is the primary hindrance for the application of halide perovskite material in light emitting device, solar cell and other devices. In this work, halide perovskite and polymer composite film has been prepared for stable and bright light emitting devices. Pure-phase Cs4PbBr6 crystals have been synthesized, their photoluminescence (PL) properties and fluorescence lifetimes were investigated. The Cs4PbBr6 crystals exhibited high uniformity but underwent rapid photodegradation under light irradiation. To address this issue, we prepared bright light emitting devices using Cs4PbBr6 crystals and polyethylene oxide (PEO) as the emission layer. The aim was to improve the optical and physical properties of halide perovskites, such as photodegradation and stability. PEO, with its excellent film-forming ability, created a uniform and dense film on the halide perovskite surface, filling microscopic defects and providing a protective barrier. FTIR, morphology, and PL analyses confirmed the protective role of the halide perovskite and polymer composite film. The composite film light emitting devices demonstrated improved stability and higher PL brightness, with a peak brightness approaching 3×108 cd/m2, which was approximately 75% higher than the pure halide perovskite devices.

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