Perovskite Quantum Dots (PQDs)
Perovskites are materials that share a crystal structure similar to the mineral called perovskite, which consists of calcium titanium oxide (CaTiO3).
Depending on which atoms/molecules are used in the structure, perovskites can possess an impressive array of interesting properties including superconductivity, ferroelectricity, charge ordering, spin dependent transport and much more. Perovskites therefore hold exciting opportunities for physicists, chemists and material scientists.
Quantum dots (QDs), sometimes referred to as semiconducting nanocrystals (NCs), are miniscule particles of a semiconducting material with diameters in the range of 2-10 nanometers (10-50 atoms). Quantum dots have properties labeled as intermediate between bulk semiconductors and discrete atoms or molecules. Their optoelectronic properties change as a function of both size and shape. QDs demonstrate optical and electronic properties different from those of larger particles. In fact, QDs tend to exhibit quantum size effects in their optical and electronic properties, like tunable and efficient photoluminescence (PL), with narrow emission and photochemical stability. This is why QDs have been incorporated as active elements in a wide variety of devices and applications, some of which are already commercially available, such as QD-based displays.
Perovskite quantum dots (PQDs) are a class of quantum dots based on perovskite materials. While these are relatively new, they have already been shown to have properties matching or surpassing those of the metal chalcogenide QDs: they are more tolerant to defects and have excellent photoluminescence quantum yields and high colour purity. Such attractive properties are extremely suited for electronic and optoelectronic applications and so perovskite quantum dots have significant potential for real world applications, some of which are already emerging, including LED displays and quantum dot solar cells.
LMU researchers advance perovskite quantum dot stability and precision control
Researchers at Ludwig-Maximilians-Universität (LMU) have reported two complementary advances that address longstanding bottlenecks in perovskite quantum dots (pQDs): instability in polar environments and the lack of precise growth control. The studies introduce a ligand-engineering strategy for solvent stability and a kinetically controlled growth method enabling sub-unit-cell precision.
Perovskite quantum dots are highly efficient light emitters due to quantum confinement effects, which enable tunable absorption and emission. However, their soft ionic lattices make them particularly vulnerable to polar solvents such as alcohols, where rapid dissolution and degradation commonly occur. This instability has limited their processing, especially in scalable and environmentally friendly (“green”) solvent systems. To overcome this, the LMU team developed a new class of dicationic Gemini ligands terminated with hydroxyl groups. These ligands form a structured, ultrathin shell (~0.7 nm) around the quantum dots. The binding mechanism is asymmetric: ammonium groups anchor strongly to the pQD surface, alkyl chains create an apolar barrier, and hydroxyl termini form a polar external interface. Crucially, the hydroxyl groups do not bind to the surface, ensuring directional ligand attachment and preventing structural disruption.
New approach enables stable blue perovskite QLEDs surpassing 20% EQE with minimal roll‑off
Researchers from the University of Electronic Science and Technology of China, Harbin Engineering University, Peking University and Soochow University have reported an advance in blue perovskite quantum dot light-emitting diodes (QLEDs), achieving record-high efficiency with minimal roll-off and excellent spectral stability. By introducing a multifunctional molecule passivation strategy based on 1‑ethyl‑3‑methylimidazolium hexafluorophosphate (EMIMPF₆), the team effectively suppressed multiple non-radiative decay pathways that have long limited blue perovskite QLED performance.
The [PF₆]⁻ anions in EMIMPF₆ coordinate strongly with lead dangling bonds and cesium sites, substantially reducing defect-assisted carrier loss and mitigating inter-dot electronic coupling. Complementarily, the [EMIM]⁺ cations interact with bromine vacancies and modulate band alignment, optimizing hole injection and improving charge balance under operating bias. This synergistic dual-ion passivation also increases the dielectric constant of the active layer, which suppresses Auger recombination - a major contributor to efficiency roll-off in high-brightness operation.
CEA-Leti team develops inorganic halide perovskite CCLs for sub-1μm microLED pixels
Researchers at CEA-Leti (Université Grenoble Alpes) have developed green and red-emitting thin-film perovskite color conversion layers (CCLs) using pulsed laser deposition (PLD), targeting GaN-based microLED displays for AR/MR applications.
GaN-based microLEDs offer a superior image quality with high dynamic range and saturated colors for AR/MR glasses, smartwatches, and more. However, achieving full-color pixels remains difficult since conventional InGaN/GaN multi-quantum wells (MQWs) emit a single color based on indium content - blue (~10% In), green (~25% In with lower efficiency), or red requiring separate InGaP materials. Mass-transfer works for larger displays but fails for microdisplays needing sub-1μm pixel pitches, where growing all three colors adjacently is still years from production.
Novel ion-pair strategy enables efficient air-processed perovskite QLEDs
Researchers from Tsinghua University and Beijing Institute of Technology have developed an ion-pair pinning strategy that enables the fabrication of high-performance perovskite quantum dot light-emitting diodes (QLEDs) under ambient air conditions - an important step toward cost-effective, large-scale production of next-generation display and lighting technologies.
a Schematic structure, b cross-sectional SEM image, and c energy diagram of the device. Image from: Light: Science & Applications
Traditionally, the emissive perovskite quantum dot (QD) layers used in QLEDs must be processed in inert gas atmospheres to avoid degradation from moisture and oxygen. This requirement hinders manufacturing scalability and increases costs. To overcome this, the team introduced tetraalkylammonium triflate (NR₄OTf) into the precursor solution to stabilize and passivate formamidinium lead bromide (FAPbBr₃) QD films during air processing.
Researchers develop electroluminescent perovskite QD synapses for energy-efficient multitasking neural networks
Researchers from Korea University and the Korea Institute of Science and Technology have developed a mixed-dimensional perovskite quantum dot–based synaptic array that utilizes the unique optoelectronic properties of halide perovskites for multitasking (MT) learning. The team fabricated dual-output electroluminescent synaptic devices using Cs₁₋ₓFAₓPbBr₃ (0.00 ≤ x ≤ 0.15) quantum dots, enabling the concurrent processing of postsynaptic current (PSC) and postsynaptic electroluminescence (PSEL) signals within a single device architecture.
Cognitive-inspired MT processing with PSC and PSEL outputs. Image from: Science Advances
Halide perovskites combine high electronic conductivity with strong light emission and compositional tunability, making them suitable for applications requiring coupled electrical–optical responses. In this system, adjusting the FA⁺ concentration and input pulse parameters modulated both the electrical and optical signal ranges, allowing the devices to achieve up to 1,000 accessible synaptic states. The array exhibited stable long-term potentiation/depression, paired-pulse facilitation, and spike-rate-dependent plasticity.
Researchers examine BaZrS3 chalcogenide quantum dots as emerging lead‑free light emitters
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.
Perovskite-Info launches a new edition of its Perovskite for Displays Market Report
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 magnetize perovskite quantum dots with a novel doping method
Researchers from the University of Oklahoma, University of Chicago, Texas A&M University, Northwestern University and the U.S. Naval Research Laboratory have reported a major advance in materials science - magnetizing perovskite quantum dots through controlled manganese (Mn²⁺) doping.
Doping transition metal ions like Mn²⁺ into colloidal quantum dots introduces novel optical and magnetic properties, but doing so efficiently in cesium lead bromide (CsPbBr₃) perovskite quantum dots (QDs) has long been a major challenge. These perovskite QDs are attractive light-emitting materials because of their structural flexibility, bright emission, and low fabrication cost, yet traditional synthesis methods often fail to incorporate magnetic dopants without sacrificing uniformity or quantum efficiency.
Stable and efficient mixed-halide quantum dot LEDs via pseudohalogen engineering
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.
New molecular strategy boosts efficiency of perovskite QLED displays
Solution-processed perovskite quantum dot (PeQD) light-emitting diodes (QLEDs) represent a promising and scalable alternative for next-generation displays by eliminating the need for vacuum deposition of emissive and charge transport layers. A major challenge, however, is that solution-processed charge transport layers (CTLs) often damage the emissive PeQD layer, leading to photoluminescence quenching and reduced device efficiency.
To overcome this limitation, researchers at China's Ningbo University have introduced two key molecular additives into CsPbBr₃ PeQD inks: an organic pseudohalide, dodecyl dimethylthioacetamide (DDASCN), and a photosensitive ligand, pentaerythritol tetrakis(3-mercaptopropionate) (PTMP).
