Perovskite LED
What are perovskites?
Perovskite is a calcium titanium oxide mineral, with the chemical formula CaTiO3, discovered in the Ural Mountains of Russia by Gustav Rose in 1839 and named after Russian mineralogist Lev Perovski (1792–1856).
Perovskites are a class of materials with a similar structure that are easily synthesized and relatively low-cost. Perovskites are considered the future of solar cells and are also predicted to play a significant role in next-gen electric vehicle batteries, displays, sensors, lasers and much more.
Perovskites can have an impressive collection of interesting properties including “colossal magnetoresistance” - their electrical resistance changes when they are put in a magnetic field (which can be useful for microelectronics). Some Perovskites are superconductors, which means they can conduct electricity with no resistance at all. Perovskite materials exhibit many other interesting and intriguing properties. Ferroelectricity, charge ordering, spin dependent transport, high thermopower and the interplay of structural, magnetic and transport properties are commonly observed features in this family. Perovskites therefore hold exciting opportunities for physicists, chemists and material scientists.
What are LEDs?
A light-emitting diode (LED) is an electronic component that is essentially a two-lead semiconductor light source. It is a p–n junction diode that emits light upon activation by a voltage applied to the leads, which makes electrons recombine with electron holes within the device, releasing energy in the form of photons. This effect is called electroluminescence, and the color of the light is determined by the energy band gap of the chosen semiconductor.
LEDs’ advantages over incandescent light sources include lower energy consumption, longer lifetime, improved physical robustness, smaller size, and faster switching. Light-emitting diodes have become ubiquitous and are found in diverse applications in the aerospace and automotive industries, as well as in advertising, traffic signals, camera flashes and much more.
LEDs meant for general room lighting currently remain more expensive than fluorescent or incandescent sources of similar output, but are significantly more energy efficient.
What can perovskites do for LEDs?
Current high-quality LEDs are based on direct bandgap semiconductors, but making these devices is no easy task because they need to be processed at high temperatures and in vacuum, which makes them rather expensive to produce in large quantities. Perovskites that are direct-bandgap semiconductors could be real alternatives to other types of direct-bandgap materials for applications like color displays, since they are cheap and easy to make and can be easily tuned to emit light of a variety of colors.
Researchers have found that organometal halide-based perovskites (a combination of lead, organics and halogens that arrange into perovskite crystal structure in the solid state) could be very suitable for making optoelectronics devices, since they can be processed in solution and do not need to be heated to high temperatures. This means that large-area films of these materials can be deposited onto a wide range of flexible or rigid substrates. The perovskites also have an optical bandgap that can be tuned in the visible to infrared regions, which makes them very promising for a range of optoelectronics applications. These materials also emit light very strongly, which makes them very suitable for making LEDs. The light emitted by the perovskites can be easily tuned, which could make them ideal for color displays and lighting, and in optical communication applications.
However, a major obstacle that perovskites will have to overcome in order to be used in LED-type devices is that electrons and holes only weakly bind in perovskite thin films. This means that excitons (electron-hole pairs) spontaneously dissociate into free carriers in the bulk recombination layer, leading to low photoluminescence quantum efficiency (PLQE), high leakage current and low luminous efficiency. This obviously impairs perovskites’ ability to create high-performance LEDs, and for perovskite materials to make a comparable impact in light emission, it is necessary to overcome their slow radiative recombination kinetics. Simply put, researchers will have to find ways of effectively confining electrons and holes in the perovskite so that they can “recombine” to emit light. Major progress is already being made in this field, and it seems that perovskites will indeed open the door to a low-cost, color-tunable approach to LED development.
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.
New transfer-printing method enables high-performance all-perovskite white tandem LEDs
Researchers from Nankai University, Hebei University and King Saud University have developed a new strategy for fabricating all‑perovskite triple‑junction light‑emitting diodes (LEDs) that simultaneously emit red, green, and blue light. This breakthrough could mark a step toward high‑efficiency, full‑color back‑lighting for next‑generation ultrahigh‑definition (UHD) displays.
Triple‑junction tandem LEDs are widely seen as the ideal architecture for compact, energy‑efficient white light sources. However, stacking multiple metal halide perovskite layers through conventional solution processing often causes severe interlayer damage and carrier losses, making it difficult to maintain high efficiency across the junctions. To address this, the team introduced a manufacturing‑compatible transfer‑printing approach for seamless monolithic integration of the three emissive layers.
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 indium-free N-doped SnO₂ transparent electrodes for high-performance PeLEDs
Sungkyunkwan University (SKKU) researchers have developed an indium-free transparent electrode technology for perovskite light-emitting diodes (PeLEDs), achieving high performance, chemical robustness, and improved device stability. The work, led by Professors Han-Ki Kim and Bo Ram Lee, introduces nitrogen-doped tin oxide (NTO) as a cost-effective, sustainable alternative to conventional indium tin oxide (ITO).
Image from: Materials Today
Perovskite LEDs are recognized for their exceptional color purity and processing flexibility, but the reliance on ITO remains a bottleneck due to indium’s rarity, high cost, and poor chemical compatibility with acidic hole transport layers such as PEDOT:PSS. Over time, indium diffusion and electrode corrosion can degrade device performance and shorten operational lifetime.
3D/2D perovskite heterojunction improves PeLED performance
Researchers from Jilin University, Fudan University, the Chinese Academy of Sciences (CAS), Beijing Jiaotong University, and Southeast University have developed a new design strategy for metal halide perovskite light-emitting diodes (PeLEDs) that improves their performance while simplifying fabrication. Their work introduces a spontaneously formed 3D/2D vertically oriented perovskite heterojunction, created via a simple one-step spin-coating process that simultaneously improves charge confinement, light extraction, and operational stability.
PeLEDs hold great promise for next-generation displays and lighting due to their tunable colors, high brightness, and low manufacturing costs. However, their efficiency has traditionally fallen short of organic LEDs (OLEDs) - which can reach ~40% external quantum efficiency (EQE) - because of insufficient charge confinement and non-radiative recombination losses at defect-rich surfaces.
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.
New synergistic phase‑control and defect‑passivation strategy boosts efficiency and brightness in quasi‑2D perovskite LEDs
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 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.
Air-grown single-crystal perovskite films deliver bright deep-blue LEDs
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.
