Perovskite LED - Page 2

Researchers from Tokyo's Institute of Science and Idemitsu Kosan recently reported a single‑particle photophysics study of colloidal BaZrS₃ chalcogenide perovskite quantum dots (QDs), targeting them as a lead‑free, stable alternative to halide perovskites for light‑emitting applications. BaZrS₃ offers a direct, visible‑range bandgap and robust chemical stability, and the key question here was how quantum confinement and surface defects govern its emission at the single‑QD level.

Structural and optical characterization. (a) Photo of BaZrS₃ QD toluene suspension; (b) powder XRD data of BaZrS₃ QDs (red) and BaZrS₃ reference (blue); (c) TEM image of the synthesized BaZrS₃ QDs; (d) size dispersion analyzed from the TEM images for 109 QDs; (e) high-resolution TEM image of a single QD showing the lattice fringes and d -spacing; (f ) absorption (blue) and PL (orange) spectra (normalized) of the BaZrS₃ QD toluene suspension; (g – i) high-resolution XPS spectra for the Ba 3d (g), Zr 3d (h), and S 2p (i) core levels, fitted as described in the text. Image from: Nanoscale

The team synthesized colloidal BaZrS₃ QDs by a hot‑injection method and obtained particles in the BaZrS₃ crystal phase with a broad size distribution from 2 nm to 18 nm (average 7.6 nm). This broad size range spans strong to weak quantum‑confinement regimes and is reflected in ensemble optics: weak PL (solution PLQY ≈ 5%) with peaks at 491 nm and 504 nm plus a red shoulder, consistent with a mixture of sizes and local environments. Composition analysis showed nearly ideal Ba:Zr ≈ 1:1 but significant sulfur deficiency, pointing to abundant surface traps that can quench emission and currently limit device‑ready performance.

Jilin University researchers have developed a multifunctional molecular strategy to improve the phase purity and defect passivation of quasi‑two‑dimensional (quasi‑2D) perovskite films, addressing long‑standing challenges of uneven phase distribution and excessive non‑radiative recombination. Conventional quasi‑2D perovskites often suffer from random crystallization caused by long‑chain organic cations, which results in incomplete energy transfer and severely limits device efficiency.

To overcome this, the team introduced a methoxy‑methyl (diphenyl) phosphine oxide (MDPO) molecule as a bifunctional additive. Density functional theory (DFT) simulations revealed that the strong electron‑donating P = O group in MDPO coordinates with under‑coordinated Pb²⁺ ions, effectively passivating trap states, while simultaneously controlling crystallization. This coordination inhibits the formation of small‑n phases and promotes the growth of large‑n ones, resulting in a more uniform perovskite layer with fewer defects.

Perovskite-Info is happy to announce an update to our Perovskite for the Display Industry Market Report. This market report, brought to you by the world's leading perovskite and OLED industry experts, is a comprehensive guide to next-generation perovskite-based solutions for the display industry that enable efficient, low cost and high-quality display devices. The report is now updated to January 2026, with all the latest commercial and research activities.

Reading this report, you'll learn all about:

• Perovskite materials and their properties
• Perovskite applications in the display industry
• Perovskite QDs for color conversion
• Prominent perovskite display related research activities

The report also provides a list of perovskite display companies, datasheets and brochures of pQD film solutions, an introduction to perovskite materials and processes, an introduction to emerging display technologies and more.

Researchers from Tsinghua University, Nanjing Tech University, University of Chinese Academy of Sciences and The Hong Kong Polytechnic University have reported a new way to make deep-blue perovskite LEDs much brighter and more stable. Their work focuses on growing ultra-smooth, defect-poor single-crystal thin films that unlock efficient deep-blue emission for future displays and lighting.​

The team developed in situ–grown single-crystal thin films of the 2D perovskite PEA₂PbBr₄ using a carefully controlled crystal growth process in air. These films are large-area, highly ordered, and atomically smooth, with a trap density far lower than conventional polycrystalline perovskite films.​ To achieve this film quality, they combined a two-stage thermal annealing process with a spatially confined growth setup using a specially treated, highly hydrophobic cover glass. Additives such as excess PEABr and a polymer (PVP) were used to slow down nucleation, improve crystal quality, and further boost the photoluminescence efficiency while keeping the surface extremely flat.​

A team of researchers, led by Professor Philip C. Y. Chow at the University of Hong Kong (HKU), has revealed how minute structural modifications in advanced perovskite materials critically influence their light-emission properties. 

The study, conducted in collaboration with research teams from The Hong Kong Polytechnic University and the Southern University of Science and Technology, provides insights and practical guidance for designing brighter, more efficient, and versatile materials. The findings could accelerate the development of next-generation optoelectronic and quantum devices.

Researchers from Korea University, Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) and Haihe Laboratory of Sustainable Chemical Transformations have reported a dual-interface molecularly tailored  passivation (MTP) strategy that could improve the design of perovskite light-emitting diodes (PeLEDs).

Solvent-free rub-on transfer strategy for dual-interface passivation. Image from: Science Advances

Conventional solution-based passivation methods often induce unwanted secondary defects, hindering charge transport and device longevity. To address this, the team developed this solvent-free rub-on transfer method that enables precise molecular deposition while preserving the perovskite film’s integrity.

Researchers from Nihon University, Vacuum Products and Smart Combinatorial Technology have developed a dual-laser vacuum process for fabricating high-quality halide perovskite thin films, presenting a controlled route for producing efficient light-emitting diode (LED) heterostructures based on cesium lead bromide (CsPbBr₃).

Halide perovskites such as CsPbBr₃ are promising materials for next-generation optoelectronic devices due to their high color purity, defect tolerance, and tunable bandgap. However, traditional solution-based processing often leads to compositional inhomogeneities and defect formation that degrade LED performance and stability. To overcome these limitations, the researchers developed a fully dry, vacuum-based fabrication approach that integrates pulsed laser deposition (PLD) with infrared molecular beam epitaxy (IR-MBE). The dual-laser configuration enables simultaneous material ablation and precise thermal control, allowing sequential low-defect growth of both inorganic and organic layers in a single chamber.

Researchers from Guangxi University, Hubei University of Automotive Technology and Shandong Normal University have developed highly efficient deep-blue light-emitting diodes (LEDs) using colloidal CsPbBr₃ perovskite nanoplatelets (NPLs), which exhibit narrow emission linewidths and thickness-tunable photoluminescence ideal for next-generation displays. 

Schematic illustration of the device architecture. Credit: Light: Science & Applications

A key innovation is an acid-assisted ligand passivation strategy that improves surface defect passivation by replacing weak long-chain ligands with stable Pb-S-P coordination bonds, enhancing photoluminescence quantum yield to 96% and producing sharp 461 nm deep-blue emission that meets the stringent Rec.2020 color standard.

Researchers from Samsung Display, Korea Advanced Institute of Science and Technology (KAIST) and Dankook University recently reported an in-situ passivation strategy for pure-blue perovskite light-emitting diodes (PeLEDs), promising for next-generation displays, fabricated by vacuum thermal evaporation. 

Image credit: Industrial Chemistry & Materials

The approach relies on a newly introduced phenanthroline-based compound, BUPH1, which is co-evaporated alongside the perovskite precursors. As the film forms, BUPH1 coordinates with under-coordinated Pb(II) ions, effectively passivating halide vacancies and suppressing ion migration in situ, which in turn enhances film morphology, raises photoluminescence efficiency, and stabilizes the emission spectrum without requiring additional fabrication steps.

Mixed-halide bromine-iodine perovskite quantum dots (PeQDs) offer excellent spectral tunability for red PeLEDs, but surface defects promote halide migration and non-radiative recombination, reducing performance. To address this issue, a Ningbo University research team has developed an innovative post-treatment strategy employing pseudohalogen inorganic ligands in acetonitrile to simultaneously etch lead-rich surfaces and passivate defects in-situ. 

This method produces high-quality CsPb(Br/I)₃ PeQDs with suppressed halide migration, enhanced photoluminescence quantum yield (PLQY), and improved film conductivity.