Advances in Organic Materials for Next-Generation Optoelectronics: Potential and Challenges

Organics, Год журнала: 2024, Номер 5(4), С. 520 - 560

Опубликована: Ноя. 11, 2024

This review provides a comprehensive overview of recent advancements in the synthesis, properties, and applications organic materials optoelectronics sector. The study emphasizes critical role development state-of-the-art optoelectronic devices such as solar cells, thin-film transistors, OLEDs. further examines structure, operational principles, performance metrics devices. Organic have emerged promising candidates due to their low-cost production potential for large-area or flexible substrate applications. Additionally, this highlights physical mechanisms governing properties high-performance materials, particularly photoinduced processes relevant charge carrier photogeneration. It discusses unique benefits over traditional inorganic including light weight, simple processing, flexibility. report delves into challenges related stability, scalability, performance, while highlighting wide range electronic exhibited by which are performances Furthermore, it addresses need research field achieve consistent across different types

Язык: Английский

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Axially chiral biphenoxazine-based multi-resonance thermally activated delayed fluorescence materials for circularly polarized electroluminescence

Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 159719 - 159719

Опубликована: Янв. 1, 2025

Язык: Английский

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Helically chiral multiresonant thermally activated delayed fluorescent emitters and their use in hyperfluorescent organic light-emitting diodes

Chemical Science, Год журнала: 2024, Номер 15(41), С. 16917 - 16927

Опубликована: Янв. 1, 2024

Helically chiral MR-TADF compounds tBuPh-BN and DPA-tBuPh-BN show narrowband circularly polarized luminescence that translates into high-performance hyperfluorescent organic light-emitting diodes.

Язык: Английский

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Axial Chiral Biphenyl MR‐TADF Enantiomers for Efficient Narrowband Circularly Polarized Electroluminescence

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Авг. 29, 2024

Abstract Circularly polarized multi‐resonance thermally activated delayed fluorescence (CP‐MR‐TADF) materials, capable of achieving circularly luminescence (CPL), play a crucial role in the field 3D display. In this study, two pairs axial chiral MR‐TADF enantiomers, ( R/S )‐ S‐AX‐BN and SO 2 ‐AX‐BN , are synthesized by fusing biphenyl skeletons containing sulfur/sulfone with classic B/N‐embedded polycyclic aromatic hydrocarbons. These compounds exhibit good photophysical properties intense CPL. display green photoluminescence, peaks at 489 495 nm, full‐width half‐maximum (FWHM) values 21 20 nm toluene, dissymmetry factors (| g PL |) 3.5 × 10 −3 2.3 doped films, respectively. Additionally, organic light‐emitting diodes (CP‐OLEDs) fabricated from narrow electroluminescence (EL) spectra FWHMs 22 nm. CP‐OLEDs achieve high maximum external quantum efficiencies 33.5% 31.5%, relatively low efficiency roll‐offs. Furthermore, they | EL 3.3 2.2 respectively, representing highest among analogs. This work introduces novel approach for designing CP‐MR‐TADF molecules provides reference fabricating narrowband

Язык: Английский

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High-Performance Deep-Blue Electroluminescence from Multi-resonance TADF Emitters with Spirofluorene-Fused Double Boron Framework

Chemical Science, Год журнала: 2024, Номер unknown

Опубликована: Янв. 1, 2024

Simultaneously extending the π-skeleton and mitigating interchromophore quenching of MR-TADF emitters resulted in narrowband deep-blue electroluminescence with EQE surpassing 40%.

Язык: Английский

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Controlling of Circularly Polarized Luminescence via Modulating the Angle Between Transition Electric and Magnetic Dipole Moments

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 21, 2025

Abstract The most challenging task in the development of chiral luminescent materials is currently increasing dissymmetry factors ( g PL , EL ) circularly polarized luminescence (CPL). Current research primarily focuses on enhancing molecular transition magnetic dipole moment, while angle between electric and moment θ e,m has received comparatively limited attention. In this study, two pairs intrinsically axial fluorescence (CP‐MR‐F) thermally activated delayed (CP‐MR‐TADF) enantiomers R / S ‐BBCz‐BN ‐OBBCz‐BN) with increased by modulating are reported. Based ‐5 H ,5′ ‐6,6′‐bibenzo[ b ]carbazole units, theoretically calculated cal for 17.7° 1.1 × 10 −2 respectively, enabling excellent CPL properties | 5.8 −3 toluene, representing one highest values among MR materials. By employing less conjugated ‐7,7′,8,8′,9,9′,10,10′‐octahydro‐5 groups better electron donating ability, ‐OBBCz‐BN demonstrate good MR‐TADF a peak at 467 nm, full width half‐maximum 27 2.5 . Furthermore, optimized organic light‐emitting diodes based these showcase high maximum external quantum efficiencies 24.7%/33.3% mirror symmetrical electroluminescence 3.4/1.2 respectively.

Язык: Английский

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Dual‐Core and Quenching Resistance of Silicic Linkage‐Based Multiple Resonance Thermally Activated Delayed Fluorescence Emitters

Advanced Optical Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 17, 2025

Abstract Multiple resonance thermally activated delayed fluorescence (MR‐TADF) materials offer narrowband emission and efficiency but suffer from spectral broadening aggregation‐caused quenching (ACQ) at high doped concentrations. In this study, two novel silicic linkage‐based dual‐core MR‐TADF emitters, DMeSiB DPhSiB, are introduced, which effectively mitigate both concentration broadening. DPhSiB exhibit bluish‐green peaking 493 495 nm with full‐width half‐maximum (FWHM) values of 21 22 in toluene photoluminescence quantum yields exceeding 90% films. At a doping 5 wt%, the organic light‐emitting diodes (OLEDs) based on achieve maximum external efficiencies (EQE max s) 27.2% 28.6% narrow FWHMs 25 24 nm, respectively. Over range wt% to 20 OLEDs maintain EQE 23.5%, 21.4%, 19.2% 24.9%, 22.7%, 19.3%, Even concentration, devices broaden by only 2 or 3 reaching 27 nm. This structural design facilitates efficient luminescence while successfully suppressing ACQ, leading improved device performance.

Язык: Английский

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Hyperfluorescence circularly polarized OLEDs consisting of chiral TADF sensitizers and achiral multi-resonance emitters

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Фев. 15, 2025

Developing circularly polarized organic light-emitting diodes (CP-OLEDs) that simultaneously achieve narrow-spectrum emission and high electroluminescence (EL) efficiency remains a formidable challenge. This work prepares two pairs of efficient thermally activated delayed fluorescence (CP-TADF) materials, featuring photoluminescence quantum yields, short lifetimes, good luminescence dissymmetry factors large horizontal dipole ratios. They can function as emitters for sky-blue CP-OLEDs, providing maximum external efficiencies (ηext,maxs) (33.8%) EL (gELs) (−2.64 × 10−3). More importantly, they sensitizers achiral multi-resonance (MR) TADF emitters, furnishing high-performance blue green hyperfluorescence (HF) CP-OLEDs with intense CP-EL ηext,maxs (31.4%). Moreover, tandem HF are fabricated the first time by employing CP-TADF MR-TADF which radiate an extraordinary (51.3%) gELs (4.87 The energy transfer well chirality-induced spin selectivity effect considered to contribute greatly generation from emitters. not only explores materials but also provides facile approach construct realization is challenging. Here, authors report these devices developing chiral

Язык: Английский

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The Role of Chalcogen Substitution and Helical Frameworks in Designing Efficient Chiral Multi‐Resonant TADF Emitters

Advanced Optical Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 7, 2025

Abstract Multi‐resonance thermally activated delayed fluorescence (MR‐TADF) emitters that display efficient reverse intersystem crossing (RISC) rates and circularly polarized luminescence (CPL) are of great interest for next‐generation organic light‐emitting diode (OLED) applications, owing to their narrowband emission, high efficiency, remarkable color purity. Here, the photophysical chiroptical properties three series molecules derived from boron/nitrogen‐embedded MR cores by systematically introducing chalcogen atoms (O, S, Se) and/or incorporating ortho‐fused benzo or naphtho groups investigated. Highly correlated quantum‐chemical calculations reveal steric repulsions resulting positions induce molecular distortions twist backbone into helical structures, which enhances chiral properties; incorporation heavier chalcogens increases spin–orbit coupling (SOC), leading enhanced RISC rates. These findings demonstrate several considered exhibit radiative decay (≈10 8 s − ¹), substantial 4 –10 values dissymmetry factor g order 10 −3 , makes them potential candidates CPL applications. Overall, this study highlights complex interplay among substitution, structural modifications, electronic structure in governing MR‐TADF emitters, offers valuable insight rational design CPL‐enabled OLEDs.

Язык: Английский

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多硼效应实现高效率窄谱带蓝光OLED研究进展（特邀）

Опубликована: Янв. 1, 2025

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