Multiresonance thermally activated delayed fluorescence (MR-TADF) emitters manifest great potential for organic light-emitting diodes (OLEDs) due to their high exciton-utilization efficiency and narrowband emission. Nonetheless, tendency toward self-quenching caused by strong interchromophore interactions would induce doping sensitivity deteriorate the device performances, effective strategy construct quenching-resistant without sacrifycing color purity is still be developed. By segregating...

High-color-purity blue and green organic light-emitting diodes (OLEDs) have been resolved thanks to the development of B/N-based polycyclic multiple resonance (MR) emitters. However, due derivatization limit B/N structures, design red MR emitters remains challenging. Herein, a series novel is reported by para-positioning N-π-N, O-π-O, B-π-B pairs onto benzene ring construct an central core. These can be facilely modularly synthesized, allowing for easy fine-tuning emission spectra peripheral...

Abstract High device efficiency and color‐purity are the two essentials for high‐quality organic light‐emitting diodes (OLEDs). Multi‐resonance (MR) molecules show great potentials high OLEDs due to their sharp emission bands. However, most MR exhibit limited from deep‐blue green spectral region. Herein, through peripherally decorating emitter with electron donors, a new approach enabling spectra of emitters red‐shift while retaining narrowband is demonstrated. By manipulating numbers...

Multi-resonance TADF (MR-TADF) emitters are promising for high-resolution OLEDs, but the concurrent optimization of excited-state dynamics and color purity remains a tough challenge. Herein, three deep-blue MR-TADF compounds (BN1-BN3) featuring gradually enlarged ring-fused structures increased rigidity accessed by lithium-free borylation in high yields from same precursor, with all possessing CIEy coordinates below 0.08. Structure-property investigations demonstrate strategic improvement...

Multiple resonance thermally activated delayed fluorescence (MR-TADF) emitters are promising candidates for narrowband organic light-emitting diodes, but their electroluminescent performance is typically hindered by the slow reverse intersystem crossing rate (kRISC). Herein, we present an effective strategy to introduce a multichannel (RISC) pathway with large spin-orbit coupling orthogonally linking electron-donating unit MR framework. Through delicate manipulation of excited-state energy...

Highly efficient circularly polarized luminescence (CPL) emitters with narrowband emission remain a formidable challenge for OLEDs (CP-OLEDs). Here, promising strategy developing chiral concurrently featuring multi-resonance thermally activated delayed fluorescence (MR-TADF) and electroluminescence (CPEL) is demonstrated by the integration of molecular rigidity, central chirality MR effect. A pair green denoted as (R)-BN-MeIAc (S)-BN-MeIAc designed. Benefited rigid quasi-planar MR-framework,...

Multiresonance thermal activated delayed fluorescence (MR-TADF) materials with an efficient spin-flip transition between singlet and triplet excited states remain demanding. Herein, we report MR-TADF compound (BN-Se) simultaneously possessing (reverse) intersystem crossing (ISC/RISC), fast radiative decay, close-to-unity quantum yield, narrowband emission by embedding a single selenium atom into common 4,4'-diazaborin framework. Benefitting from the high RISC efficiency accelerated...

Heavy-atom integration into thermally activated delayed fluorescence (TADF) molecule could significantly promote the reverse intersystem crossing (RISC) process. However, simultaneously achieving high efficiency, small roll-off, narrowband emission and good operational lifetime remains a big challenge for corresponding organic light-emitting diodes (OLEDs). Herein, we report pure green multi-resonance TADF BN-STO by introducing peripheral heavy atom selenium onto parent BN-Cz molecule. The...

Abstract The blue multi‐resonance thermally activated delayed fluorescence materials, simultaneously realizing narrow full‐width at half‐maximum, high external quantum efficiency (EQE), and low roll‐off, remains a formidable challenge. Herein, three novel emitters, namely PTZBN1, PTZBN2, PTZBN3, are designed by gradual peripheral modification in boron/nitrogen (B/N) embedded polycyclic skeleton, which exhibit progressively hypsochromic‐shifted emission from 490 nm (PTZBN1) to 468 (PTZBN3)...

Abstract Helicenes exhibit substantial potential as circularly polarized luminescence (CPL) active molecules. However, their application in organic light‐emitting diodes (CP‐OLEDs) is typically hindered by the challenge of integrating both high color purity and efficient triplet‐harvesting capability, particularly blue spectral region. Herein, a series hetero[6]helicene‐based emitters that strategically engineered through helical extension deep‐blue double‐boron‐based multiple resonance...

ABSTRACT Multi-boron-embedded multiple resonance thermally activated delayed fluorescence (MR-TADF) emitters show promise for achieving both high color-purity emission and exciton utilization efficiency. However, their development is often impeded by a limited synthetic scope excessive molecular weights, which challenge material acquisition organic light-emitting diode (OLED) fabrication vacuum deposition. Herein, we put forward B‒N covalent bond-involved π-extension strategy via...

Abstract 1,4‐BN‐doped polycyclic aromatic hydrocarbons (PAHs) have emerged as very promising emitters in organic light‐emitting diodes (OLEDs) due to their narrowband emission spectra that may find application high‐definition displays. While considerable research has focused on investigating the properties of these materials, less attention been placed synthetic methodology. Here we developed an efficient method for PAHs, which enables sustainable production emitting materials. By...

Abstract Hyperbranched polymers are important soft nanomaterials but robust synthetic methods with which the polymer structures can be easily controlled have rarely been reported. For first time, we present a one‐pot one‐batch synthesis of polytriazole‐based hyperbranched both low polydispersity and high degree branching (DB) using copper‐catalyzed azide–alkyne cycloaddition (CuAAC) polymerization. The use trifunctional AB 2 monomer that contains one alkyne two azide groups ensures all Cu...

Two deep-red/near-infrared (NIR) iridium phosphors, (fldpqx)2Ir(acac) and (thdpqx)2Ir(acac), were rationally designed synthesized considering the emission wavelength, efficiency, solubility. In optimized solution-processed phosphorescent polymer light-emitting devices, (fldpqx)2Ir(acac)-based device achieved a maximum external quantum efficiency of 5.7% with peak at 690 nm, while (thdpqx)2Ir(acac)-based 3.4% 702 which are comparable to highest values ever reported for solution-processable...

Abstract Multi‐resonance thermally activated delayed fluorescence (MR‐TADF) offers an exceptional solution for narrowband organic light‐emitting diode devices in terms of color purity and luminescence efficiency, while the development new MR skeleton remains exigent task. It is hereby demonstrated that a simple modification B (boron)−N (nitrogen) framework by sp 3 ‐carbon insertion will significantly bathochromic shift short‐range charge‐transfer emission, boost reverse intersystem crossing...

The rapid development of efficient organic click coupling reactions has significantly facilitated the construction synthetic polymers with sophisticated branched nanostructures. This Feature Article summarizes recent progress in application copper-catalyzed and copper-free azide–alkyne cycloaddition (CuAAC CuFAAC) syntheses dendrimers, hyperbranched polymers, star graft molecular brushes, cyclic polymers. Literature reports on interesting properties functions these polytriazole-based...

By integrating high molecular rigidity and stable chirality, two pairs of D*-A type circularly polarized thermally activated delayed fluorescence (CP-TADF) emitters with an almost absolute quasi-equatorial conformer geometry excellent photoluminescence quantum efficiencies (PLQYs) are developed, achieving state-of-the-art electroluminescence performance among blue orange organic light-emitting diodes (CP-OLEDs).

Abstract To concurrently realize large electroluminescence dissymmetry factor and high device efficiency remains a formidable challenge in the development of circularly polarized organic light‐emitting diode (CP‐OLED). In this work, by introducing famous chiral resource R ‐camphor, two green iridium(III) isomers Λ/Δ‐Ir‐( ‐camphor) containing dual stereogenic centers at iridium ancillary ligand, are efficiently synthesized. Benefiting from their phosphorescence quantum yields (≈93%) obvious...

How to develop efficient red-emitting organometallics of earth-abundant copper(I) is a formidable challenge in the field organic light-emitting diodes (OLEDs) because Cu(I) complexes have weak spin-orbit coupling and serious excited-state reorganization effect. Here, red complex, MAC*-Cu-DPAC, was developed using rigid 9,9-diphenyl-9,10-dihydroacridine donor ligand carbene-metal-amide motif. The complex achieved satisfactory emission, high photoluminescence quantum yield up 70%,...

Abstract Thermally activated delayed fluorescence (TADF) materials based on multiple resonance (MR) effect exhibit enormous potentials in organic light‐emitting diodes (OLEDs) with high color purity due to their intrinsically narrow emission. However, most of MR‐TADF emitters are limited the boron‐nitrogen‐based rigid skeleton. In this work, three novel emitters, namely CzBNO, DMAcBNO and DPAcBNO, elaborately constructed, TADF properties which realized by virtue opposite MR boron...

Developing organic thermally activated delayed fluorescence (TADF) emitters with high efficiency and narrowband emissions is crucial challenging for high-quality light-emitting diodes (OLEDs). Here, three multiresonance TADF DPACzBN1, DPACzBN2, DPACzBN3 are designed via a peripheral decoration strategy synthesized through lithium intermediate cascade borylation reaction (15% yield DPACzBN1) or more efficient lithium-free direct (45% DPACzBN2 75% DPACzBN3). All the exhibit similar blue...