Displays - Page 2

A team of researchers, which was led by Seoul National University and included teams from SN Display, Imperial College London, University of Cambridge, Hanyang University, KAIST, University of Tennessee, Universidad de Valencia, and PEROLED, has demonstrated a hierarchical-shell perovskite platform that delivers near-unity efficiency together with commercial-grade stability and full display-scale manufacturability. The team stated that this work could pave the way for next-generation vivid-color display technologies. 

A HS enables lattice-interface interlocking, transforming colloidal perovskite nanocrystals into commercially viable solid-state emitters. Image from: Science

The researchers developed a hierarchical-shell architecture that chemically interlocks perovskite nanocrystals with inter-bonded PbSO₄, SiO₂, and polymer layers, suppressing lattice softening, ion migration, and interfacial degradation that previously limited stability. This design enabled solid-state perovskite nanocrystal films to reach a photoluminescence quantum yield of 100% and an external quantum yield of 91.4%, the highest reported among solid-state emitters such as phosphors, organic emitters, quantum dots, and other halide perovskites. Because the emitters retain intrinsically narrow linewidths of about 20 nm, they can satisfy and even exceed the Rec. 2020 color standard, allowing more vivid, lifelike colors than typical OLED and quantum-dot displays.

Metal halide perovskites' narrow emission spectrum, strong light absorption, brightness, and facile tunability make them ideal candidates for color-conversion layers in displays. Unlike conventional quantum dots, perovskites can achieve high-purity color emission with significantly thinner layers, enabling efficient conversion of blue light into red and green without the need for external color filters. This reduces system complexity while increasing brightness and color accuracy.

Researchers from Sungkyunkwan University, Pohang University of Science and Technology (POSTECH), University of Cambridge and University of Oxford have shown that perovskite films can absorb over 99.9% of incident blue light while generating vivid, stable emission, all with lead content kept below the Restriction of Hazardous Substances (RoHS) threshold. The research demonstrates that a perovskite layer only one-fifth the thickness of conventional quantum-dot films provides effective color conversion, paving the way toward more compact and efficient devices. Moreover, the integration of optical strategies such as light scattering structures, photonic crystals, dimensional control, and photon recycling further enhances performance.

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.

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). 

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 August 2025, 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 at Nanjing Tech University (NanjingTech) and South China University of Technology have demonstrate a layer-by-layer (LBL) thermal-evaporation strategy to fabricate high-quality perovskite-emitting films with tunable emission wavelengths. 

Schematic diagram of sequential thermal evaporation of perovskite thin films. Image credit: Nature Communications

Thermal-evaporated perovskite light-emitting diodes are highly promising for future display and lighting. However, current multi-source co-evaporation methods face challenges such as difficulty in regulating crystallinity, especially for red perovskite light-emitting diodes, whose external quantum efficiencies are still less than 2%.

Researchers at Korea's Kyung Hee University have developed a dual-role approach utilizing octylammonium iodide (OAI) to simultaneously modulate perovskite crystallization and passivate defects in high-efficiency pure red PeLEDs. The incorporation of this additive governs the crystallization dynamics, suppressing uncontrolled grain growth and minimizing the formation of grain boundaries. The OAI additive also effectively passivates ionic and surface defects within the perovskite lattice, as validated by comprehensive optoelectronic and morphological analyses. 

This synergistic approach combining regulated crystallization and defect passivation yields compact, uniform perovskite films with suppressed non-radiative recombination and enhanced charge transport. The team consequently fabricated PeLEDs that achieved pure red emission, delivering a maximum brightness (ELMax) of 1274.9 cd m⁻², a peak external quantum efficiency (EQEMax) of 16.47 %, and a low turn-on voltage (Von) of 1.59 V, representing a 3.1-fold and 5.1-fold enhancement in ELMax and EQEMax, respectively, over the pristine device (409.6 cd m⁻² and 3.26 %). 

According to reports, Chinese startup Yicai Core Light will begin mass production of a new microLED display chip that uses perovskite quantum dot technology to achieve a full-color, micro-scale display. The Company is preparing to start producing its microLED microdisplays in the autumn of 2025, in a pilot production line that will be built with help from Ningbo-based Yongjiang Laboratory.

Founder and General Manager Li Fei explained that the chip acts like a 'translator,' accurately converting digital information into the light and images a user sees. Li Fei believes that this technology will improve augmented reality (AR) technology and solve two of the biggest hurdles holding back mainstream adoption of augmented reality glasses: poor outdoor visibility and short battery life.

A research team, led by Professor Yong-Young Noh and Dr. Youjin Reo from the Department of Chemical Engineering at POSTECH (Pohang University of Science and Technology), has developed p-channel Sn²⁺-halide perovskite TFTs using a thermal evaporation approach with inorganic caesium tin iodide (CsSnI₃). 

The project was a collaborative effort with Professors Ao Liu and Huihui Zhu from the University of Electronic Science and Technology of China (UESTC) and resulted in the development of high-performance, stable p-channel CsSnI₃-based TFTs using a commercially compatible vapor-deposition approach with PbCl₂ as an additive. The volatile chloride triggers solid-state reactions and the conversion of as-evaporated precursor compounds. This facilitates the formation of high-quality and uniform perovskite films, and also modulates the high hole density, making them suitable for use as channel layers. The optimized CsSnI₃:PbCl₂ TFTs delivered average µFE of around 34 cm2 V⁻¹ s⁻¹, on/off ratio of around 10⁸ and storage stability of more than 150 days. The team also demonstrated a large-scale Sn²⁺-halide perovskite TFT array that overcomes the technical challenges faced in the solution process. The vapor-deposited TFTs could be used in backplanes for organic light-emitting diode displays, or in logic devices and circuits for monolithic three-dimensional integration, where low process temperatures are required.

An international collaboration that includes researchers from China, Switzerland and Saudi Arabia, made progress in the field of perovskite ultra-high-definition (UHD) display technology.  

In order to crack the problem of phase instability in pure red CsPbI₃ perovskite quantum dots in perovskite UHD display technology, the team examined the strategy of “stress manipulation of epitaxial heterojunction interface”. For the first time, the team used the total solution method to realize large-area in-situ controllable preparation of perovskite vdW epitaxial heterojunctions. This discovery yielded, according to the team, a 'breakthrough in material stability and device performance'. It resulted in a high-efficiency, stable pure red perovskite electroluminescent device (LED). Thus, it provides key technical support for the development of next-generation UHD technology.