Unveiling the Mechanics Behind Polyimide’s Friction-Greening Phenomenon DOI Open Access
Zhipeng Li, Dawei Ma, Haowen Li

и другие.

Polymers, Год журнала: 2024, Номер 16(23), С. 3253 - 3253

Опубликована: Ноя. 22, 2024

Polyimide (PI) has been widely used as a flexible substrate in the OLED display industry to achieve folding and other functions. However, it unintended side effects, such friction-greening, green screen phenomenon caused by friction after prolonged usage. This is related drifting TFT characteristics charge accumulating PI combination with high efficiency of pixels. In this study, mechanism influence structure on friction-greening was investigated. Increasing process temperature from 350 °C 470 °C, chain segment within became more regularized. Thus, material had higher conductivity shallower trap energy levels, which confirmed X-ray small angle scattering, dielectric, photoluminescence, methods. Under discharge conditions, less accumulated PI, thus effectively mitigating threshold voltage drift thin-film transistor (TFT). These results will contribute further optimization development materials.

Язык: Английский

Recent Advances in Narrow Emission Bandwidth Materials for Application in Organic Light‐Emitting Diodes DOI Open Access
Jia-Min Kang, Dong Jin Shin, Jun Yeob Lee

и другие.

Advanced Optical Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 21, 2025

Abstract The preparation of narrow emission bandwidth materials is crucial for the development advanced organic light‐emitting diodes (OLEDs). In this review article, state‐of‐the‐art methodologies used emitters with high color purity are summarized, and favorable design strategies rationally organized. Currently OLEDs have some issues, such as device stabilization that must be resolved, should also considered. Given recent exponential growth in number types narrowband emissive organometallic complexes exhibiting multiple‐resonance thermally activated delayed fluorescence metal‐to‐ligand charge transfer characteristics, there an urgent need to establish key technology descriptors purity. review, developments boron, fused indolocarbazole, carbonyl, phosphine oxide, exhibit spectra described, future directions advance performance devices suggested.

Язык: Английский

Процитировано

2

Efficient harvesting of triplet excitons via multiple fast TTA up-conversion and high-lying reverse intersystem crossing channels for efficient blue fluorescent organic light-emitting diodes DOI Creative Commons
Jianwen Qin, Xianfeng Qiao,

Shu Xiao

и другие.

Chemical Science, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

A high efficiency blue OLED with fast TTA up-conversion and highly-lying reverse intersystem crossing channels was successfully fabricated. The maximum EQE reached 11.4% CIE coordinates of (0.13, 0.11).

Язык: Английский

Процитировано

0

Metasurface‐Integrated Organic Light‐Emitting Diodes: Analysis of Spectral Effects on Theoretical and Experimental Performance DOI Open Access
Kyungnam Kang,

Hajun Yoo,

Hyunwoong Lee

и другие.

Laser & Photonics Review, Год журнала: 2025, Номер unknown

Опубликована: Фев. 19, 2025

Abstract Organic light‐emitting diodes (OLEDs) have emerged as a leading display technology and become rapidly embraced in commercial applications. In this paper, we explore the integration of metasurface (MS) designs for polarizer‐free top‐emitting OLEDs (TOLEDs) with enhanced absorption ambient light. From performance evaluated by varying geometrical parameters MS, it is found that broadband long wavelength range, associated localized surface plasmon mode can be tuned adjusting these parameters. Optimizing effectively localize enhance near‐fields at MS edges, thereby reducing reflectance MS‐integrated TOLEDs (MI‐TOLEDs) under An optimized may balance reduced minimal emission loss from TOLEDs. Numerical results suggest MI‐TOLEDs improve spectral out‐coupled light intensity overall angular enhancement power least 50% 45%, respectively, over conventional TOLED. whole visible MI‐TOLED shows 48% lower compared to TOLED, which confirmed experimental data measured optical cavity. Changes encapsulation thickness influence polariton mode, shifting resonance conditions spectra within short range.

Язык: Английский

Процитировано

0

Hot‐Exciton‐Involved Dual‐Channel Stepwise Energy Transfer Enabling Efficient and Stable Blue OLEDs with Narrow Emission and High Luminance DOI Open Access
Han Zhang,

Jingli Lou,

Kai Zhang

и другие.

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 27, 2025

Marching toward next-generation ultrahigh-definition and high-resolution displays, the development of high-performance blue organic light-emitting diodes (OLEDs) with narrow emission high luminance is essential requires conceptual advancements in both molecular device design. Herein, a emitter reported that exhibits hot-exciton aggregation-induced characteristics, use it as sensitizer proposed triplet-triplet annihilation (TTA)-assisted hot-exciton-sensitized fluorescence (HSF) device, abbreviated THSF. Results show through dual-channel stepwise Förster Dexter energy transfer processes, THSF system can simultaneously enhance exciton utilization, accelerate dynamics, reduce concentration triplet excitons. The smooth management excitons makes overall performance superior to control TTA HSF devices. Furthermore, narrowband (CIEx,y = 0.13, 0.12) OLED achieved using two-unit tandem design, providing an excellent maximum external quantum efficiency 18.3%, record-high L90% (the where ƞext drops 90% its peak value) ≈20 000 cd m-2, long half-lifetime at 100 m-2 initial ≈13 256 h. These results showcase great potential strategy realizing efficient stable OLEDs luminance.

Язык: Английский

Процитировано

0

Tunable Near‐White Light Emission From a Single‐Molecule via Strategic Utilization of Aldehyde‐Gemdiol Intrinsic Equilibrium DOI

Zhengxing Zeng,

Xuerui Song, Xi Hu

и другие.

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 24, 2025

Abstract White‐light emitting organic materials have garnered significant attention due to their potential applications in lighting and display technologies. Compared systems that emit distinct colors by combining multiple molecules, single‐molecule white‐light emission offer notable advantages, such as simple preparation, good repeatability stability. In this study, a novel fluorescent molecule (BTP‐CHO) was developed. For the first time, near‐white light system exploiting internal equilibrium of aldehyde‐gemdiol water BTP‐CHO constructed. exists predominantly aldehyde form DMSO shows green fluorescence; while blue fluorescence because water. Polychromatic photoluminescence could be achieved fine‐tuning various parameters, including excitation wavelength solvent ratio. Additionally, we synthesized three derivatives for further investigating universality strategy results indicate has universality. Finally, successfully applied development information encryption hydrogels. This work provides new insights into design emitters broadens scope research on intrinsic about emitting.

Язык: Английский

Процитировано

0

Comprehensive Review on the Structural Diversity and Versatility of Multi-Resonance Fluorescence Emitters: Advance, Challenges, and Prospects toward OLEDs DOI Creative Commons
Xiugang Wu,

Songqian Ni,

Chih‐Hsing Wang

и другие.

Chemical Reviews, Год журнала: 2025, Номер unknown

Опубликована: Май 9, 2025

Fluorescence emitters with a multiple-resonant (MR) effect have become research hotspot. These MR mainly consist of polycyclic aromatic hydrocarbons boron/nitrogen, nitrogen/carbonyl, and indolocarbazole frameworks. The staggered arrangement the highest occupied molecular orbital lowest unoccupied facilitates MR, resulting in smaller internal reorganization energy narrower emission bandwidth. Optimal charge separation suppresses gap between singlet triplet excited states, favoring thermally activated delayed fluorescence (TADF). MR-TADF materials, due to color purity high efficiency, are excellent candidates for organic light-emitting diodes. Nevertheless, significant challenges remain; particular, limitation imposed by alternated core configuration hinders their diversity versatility. Most existing materials concentrated blue-green range, only few red near-infrared spectra. This review provides timely comprehensive screening from pioneering work present. Our goal is gain understandings structure-performance relationship both basic advanced perspectives. Special emphasis placed on exploring correlations chemical structure, photophysical properties electroluminescent performance depth breadth an aim promote future development emitters.

Язык: Английский

Процитировано

0

Unveiling the Mechanics Behind Polyimide’s Friction-Greening Phenomenon DOI Open Access
Zhipeng Li, Dawei Ma, Haowen Li

и другие.

Polymers, Год журнала: 2024, Номер 16(23), С. 3253 - 3253

Опубликована: Ноя. 22, 2024

Polyimide (PI) has been widely used as a flexible substrate in the OLED display industry to achieve folding and other functions. However, it unintended side effects, such friction-greening, green screen phenomenon caused by friction after prolonged usage. This is related drifting TFT characteristics charge accumulating PI combination with high efficiency of pixels. In this study, mechanism influence structure on friction-greening was investigated. Increasing process temperature from 350 °C 470 °C, chain segment within became more regularized. Thus, material had higher conductivity shallower trap energy levels, which confirmed X-ray small angle scattering, dielectric, photoluminescence, methods. Under discharge conditions, less accumulated PI, thus effectively mitigating threshold voltage drift thin-film transistor (TFT). These results will contribute further optimization development materials.

Язык: Английский

Процитировано

0