Near‐Infrared Circularly Polarized Electroluminescence with Switchable Handedness in Organic LEDs

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 28, 2025

Abstract In this study, the development of first fully‐organic circularly polarized near‐infrared organic light–emitting diode (CP‐NIR‐OLED) is presented. The devices are made by using a co‐assembled active layer consisting commercially available NIR‐emitting indacenodithienothiophene‐based molecule (ITIC) and chiral inducer. Here, ITIC, which traditionally utilized as non‐fullerene acceptor in photovoltaics for its superior characteristics, demonstrated to act an effective NIR emitter solution‐processed OLEDs. By incorporating additive into layer, emission successfully polarized, achieving CP‐NIR‐OLEDs with dissymmetry values up 0.074 maximum radiance 1.65 Wsr −1 m −2 . Additionally, study shows that manipulating position radiative exciton recombination zone within circular polarization sign can be switched, while maintaining even enhancing device performance. This also exhibit remarkable operational stability, indicating their potential short‐term applications. work provides significant step forward CP‐OLEDs opens new avenues use advanced optoelectronic devices.

Language: Английский

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Dual luminescence and infrared circularly polarized luminescence up to 900 nm with platinum complexes bearing helical donor-acceptor ligand

Materials Chemistry Frontiers, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Chiral molecular materials able to emit circularly polarized luminescence (CPL) have attracted considerable interest in the last few decades, due potential of CP-light a wide range applications. While CP luminescent molecules with blue, green, and yellow emissions are now well-reported, NIR CPL from organic organometallic compounds lags behind dual challenge promoting radiative deexcitation excited state this low energy region while assuring significant magnetic dipole transition moment, prerequisite for generating CPL. Based on versatile axially chiral arylisoquinoline ligand, we report synthesis chiroptical properties donor-acceptor platinum(ii) complexes displaying that extends up almost 900 nm. Interestingly, these emitters show both fluorescence phosphorescence solution, intensities depending charge-transfer character ligand. Experimental theoretical investigations feature strongly impacts intersystem crossing event between singlet triplet states related lifetime. The effect is less important regarding CPL, most dissymmetry factors values

Language: Английский

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Multi-responsive circularly polarized luminescence micro-patterns with high figure of merit towards multi-dimensional data encoding

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 159821 - 159821

Published: Jan. 1, 2025

Language: Английский

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Ultraviolet Circularly Polarized Luminescence: Progress in Chiral Materials and Emerging Applications

Journal of Luminescence, Journal Year: 2025, Volume and Issue: 280, P. 121127 - 121127

Published: Feb. 11, 2025

Language: Английский

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Near‐Infrared Electroluminescent Conjugated Copolymer: Triphenyalmine‐Functionalized Benzothiadiazole‐Thiophene System for Circularly Polarized OLEDs

Macromolecular Rapid Communications, Journal Year: 2025, Volume and Issue: unknown

Published: March 5, 2025

We present a conjugated copolymer designed as near-infrared (NIR) emitter for organic light-emitting diodes (NIR-OLEDs). The low bandgap donor-acceptor copolymer, comprising terthiophene derivative (3T) and benzothiadiazole (BT), is end-capped with bulky triphenyalmine (TPA) groups (3TBT-TPA). Compared the parent homologue capped simple phenyl rings, 3TBT-TPA shows enhanced solubility in solvents improved photoluminescence quantum yield thanks to reduced close packing of chains. 3TBT-TPA, used both neat emitting layer blended fluorene-benzothiadiazole (F8BT) host NIR-OLEDs, external efficiency up 0.58%. Additionally, chiral induction achieved F8BT:3TBT-TPA blend film using commercial dopant, yielding circularly polarized (CP), (PL) electroluminescence (EL) range 500-800 nm maximum dissymmetry factor 10-2. This first example CP-NIR EL from polymer. work highlights potential TPA-capped strategy copolymers efficient NIR-OLEDs opens new perspectives use polymers NIR photonic applications.

Language: Английский

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Integrated Circular Polarization Detectors Based on Asymmetric Materials or Structures

Symmetry, Journal Year: 2025, Volume and Issue: 17(4), P. 484 - 484

Published: March 24, 2025

Circular polarization detection plays a significant role in various fields, such as optical communication, quantum information processing, biomedical detection, imaging, and sensing. Traditionally, similar to linear circular is realized by systems composed of discrete components, which tend be bulky complex. With the advancement technology, there growing demand for efficient compact integrated detectors. In this review, we focus on two advanced research areas concerning detectors: those based asymmetric materials or structures. We explore recent advances future prospects challenges development

Language: Английский

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Magnetic circularly polarized luminescence in Fe2+-sensitized YbPO4: Phase transition, energy transfer and magneto-optical effect

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 687, P. 168 - 188

Published: Feb. 7, 2025

Language: Английский

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Challenges and Opportunities of Upconversion Nanoparticles for Emerging NIR Optoelectronic Devices

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 16, 2025

Abstract Upconversion nanoparticles (UCNPs), incorporating lanthanide (Ln) dopants, can convert low‐energy near‐infrared photons into higher‐energy visible or ultraviolet light through nonlinear energy transfer processes. This distinctive feature has attracted considerable attention in both fundamental research and advanced optoelectronics. Challenges such as low energy‐conversion efficiency nonradiative losses limit the performance of UCNP‐based optoelectronic devices. Recent advancements including optimized core–shell structures, tailed Ln‐doping concentration, surface modifications show significant promise for improving stability. In addition, combining UCNPs with functional materials broaden their applications improve device performance, paving way innovation next‐generation paper first categorizes elaborates on various upconversion mechanisms UCNPs, focusing strategies to boost prolong luminescence. Subsequently, an in‐depth discussion that enhance expand functionality is provided. Furthermore, a wide range devices explored, multiple emerging neuromorphic computing are highlighted. Finally, existing challenges potential solutions involved developing practical considered, well outlook future technologies

Language: Английский

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Near-infrared circularly polarized luminescence enabled by chiral inorganic nanomaterials

Nanoscale, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 30, 2024

Near-infrared circularly polarized luminescence (NIR-CPL) has attracted widespread attention owing to its fascinating characteristic-circular polarization in specific illumination regions-offering advances applications such as information security and cancer detection. For the generation of NIR-CPL, chiral inorganic nanomaterials have emerged desirable candidates due their extraordinary chiroptical properties. In this mini-review, we first highlight recent NIR-CPL produced from nanomaterials. Thereafter, present Finally, prospect challenges field provide new perspectives insights for development novel materials applications.

Language: Английский

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Enhanced Circularly Polarized Luminescence Modulation Using Dichroic Conjugated Polymer in Cholesteric Liquid Crystals

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 25, 2024

Abstract Negative dichroic dyes are crucial for enhancing the brightness of liquid crystal displays (LCDs) and modulating circularly polarized luminescence (CPL) in cholesteric crystals (CLCs) through supramolecular co‐assembly. However, majority fluorescent molecules exhibit positive dichroism, there is a limited understanding designing negative molecules. In this paper, novel design principle proposed to construct polymer by introducing space charge transfer (TSCT) side chain structure backbone. Specifically, two conjugated polymers (P1, P2) synthesized using Suzuki coupling reaction donor‐acceptor (D‐A) type monomers (V‐type M1 I‐type M2) with fluorenyl monomer. P1 exhibits its orientational order parameter (S F ) up S FP1 = –0.18. On contrary, P2 dichroism ( FP2 + 0.27). This variation arises from differing orientations rigidly functional chains FM1 0.07; FM2 0.31), which affect alignment (parallel or perpendicular) backbone toward CLCs phenomenon facilitates controllable precisely modulates handedness CPL signals, thereby facilitating successful implementation multidimensional information encryption systems CLCs.

Language: Английский

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