Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)
Published: Jan. 2, 2025
Language: Английский
Chemical Society Reviews, Journal Year: 2024, Volume and Issue: 53(3), P. 1624 - 1692
Published: Jan. 1, 2024
This review highlights organoboron-based multiple-resonance compounds’ synthetic strategies classified as one-pot borylation, one-shot and late-stage functionalisation, explores material structure–photophysical property correlations.
Language: Английский
Citations
118
Advanced Materials, Journal Year: 2023, Volume and Issue: 35(30)
Published: April 19, 2023
Polycyclic heteroaromatics with multi-resonance (MR) characteristics are attractive materials for narrowband emitters in wide-color-gamut organic light-emitting diodes. However, MR pure-red colors still rare and usually exhibit problematic spectral broadening when redshifting emission. Here, a emitter is reported by fusing indolocarbazole segments into boron/oxygen-embedded skeleton, realizing BT.2020 red electroluminescence the first time together high efficiency an ultralong lifetime. The rigid segment possesses strong electron-donating ability due to its para-positioned nitrogen-π-nitrogen backbone also enlarges π-extension of skeleton suppress structural displacement during radiation, achieving concurrently redshifted narrowed emission spectrum. An maximum at 637 nm full width half-maxima merely 32 (0.097 eV) recorded toluene. corresponding device simultaneously exhibits CIE coordinates (0.708, 0.292) precisely matching point, external quantum 34.4% low roll-off LT95 (time 95% initial luminance) >10 000 h 1000 cd m-2 . These performance superior even those state-of-the-art perovskite quantum-dot-based devices this specific color, paving way toward practical applications.
Language: Английский
Citations
94
Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(50)
Published: Aug. 7, 2023
Abstract Multi‐resonance thermally activated delayed fluorescence (MR‐TADF) emitters have drawn considerable attention because of their remarkable optoelectronic properties high emission efficiency and narrow profile, represent an active subject cutting‐edge research in the organic electroluminescence (EL). However, slow reverse intersystem crossing (RISC) rate MR‐TADF emitter caused by large energy gap (Δ E ST ) small spin‐orbit coupling (SOC) matrix elements between singlet triplet excited states limits further development EL devices. Currently, innovative molecular design strategies been developed including heavy atom integration, π‐extended MR framework metal perturbation, so on to improve RISC process for high‐performance Here, overview is presented recent progress with fast ( > 10 −5 s −1 ), particular design, properties, device performance light‐emitting diodes (OLEDs), which intends systematize knowledge this thriving highly efficient emitters. Finally, challenges future prospects materials are discussed comprehensively.
Language: Английский
Citations
88
Advanced Science, Journal Year: 2023, Volume and Issue: 10(28)
Published: Aug. 16, 2023
Abstract With the surging demand for ultra‐high‐resolution displays, International Telecommunication Union (ITU) announce next‐generation color gamut standard, named ITU‐R Recommendation BT.2020, which not only sets a seductive but challenging milestone display technologies also urges researchers to recognize importance of coordinates. Organic light‐emitting diodes (OLEDs) are an important technology in current daily life, they face challenges approaching BT.2020 standard. Thermally activated delayed fluorescence (TADF) emitters have bright prospects OLEDs because possess 100% theoretical exciton utilization. Thus, development TADF emitting primary red (R), green and blue (B) emission is great significance. Here, comprehensive overview latest advancements that exhibit Commission Internationale de l'Éclairage (CIE) coordinates surpassing National Television System Committee (NTSC) standards presented. Rational strategies molecular designs, as well resulting photophysical properties OLED performances, discussed elucidate underlying mechanisms shifting CIE both donor‐acceptor multiple resonance (MR) typed toward Finally, realization wide‐color‐gamut standard this research area provided.
Language: Английский
Citations
69
Advanced Materials, Journal Year: 2024, Volume and Issue: 36(24)
Published: March 2, 2024
Abstract Thanks to the extensive efforts toward optimizing perovskite crystallization properties, high‐quality films with near‐unity photoluminescence quantum yield are successfully achieved. However, light outcoupling efficiency of light‐emitting diodes (PeLEDs) is impeded by insufficient extraction, which poses a challenge further advancement PeLEDs. Here, an anisotropic multifunctional electron transporting material, 9,10‐bis(4‐(2‐phenyl‐1H‐benzo[d]imidazole‐1‐yl)phenyl) anthracene (BPBiPA), low extraordinary refractive index ( n e ) and high mobility developed for fabricating high‐efficiency The molecular orientations BPBiPA can result in 1.59 along z ‐axis direction. Optical simulations show that effectively mitigate surface plasmon polariton loss enhance photon extraction waveguide mode, thereby improving In addition, facilitate balanced carrier injection As result, green PeLEDs record external 32.1% current 111.7 cd A −1 obtained, provides new inspirations design materials high‐performance
Language: Английский
Citations
60
Advanced Materials, Journal Year: 2023, Volume and Issue: 36(1)
Published: Nov. 14, 2023
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 thermally activated delayed fluorescence (MR‐TADF) motif, introduced. Importantly, does not cause apparent structural deformation or perturb frontier molecular orbitals; thus, preserving emission MR‐TADF characteristics parent molecule. This approach also leads to reduced reorganization energy, resulting with narrower linewidth higher photoluminescence quantum yield. Further, motif enhances racemization barrier improved CPL performance dissymmetry factor values up 1.5 × 10 −3 . Exploiting these merits, devices incorporating chiral dopants demonstrate within Broadcast Service Television 2020 color‐gamut range, record external efficiencies (EQEs) 29.3%, have distinctive electroluminescence (CPEL) signals. Overall, authors’ findings underscore promising strategy for designing narrowband chiroptical materials advancing high‐definition displays.
Language: Английский
Citations
59
Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(19)
Published: March 11, 2023
Advanced multiple resonance induced thermally activated delayed fluorescence (MR-TADF) emitters have emerged as a privileged motif for applications in organic light-emitting diodes (OLEDs), because they furnish highly tunable TADF characteristics and high color purity emission. Herein, based on the unique nitrogen-atom embedding molecular engineering (NEME) strategy, series of compounds BN-TP-Nx (x=1, 2, 3, 4) been customized. The anchored at different position triphenylene hexagonal lattice entails varying degrees perturbation to electronic structure. newly-constructed demonstrated precise regulation emission maxima MR-TADF meet actual industrial demand, further enormously enriched reservoir. BN-TP-N3-based OLED exhibits ultrapure green emission, with peak 524 nm, full-width half-maximum (FWHM) 33 Commission Internationale de L'Eclairage (CIE) coordinates (0.23, 0.71), maximum external quantum efficiency (EQE) 37.3 %.
Language: Английский
Citations
55
Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(20)
Published: March 15, 2023
Though the flourishment of materials with multiple resonance (MR) in blue to green regions, red-emissive MR emitters are still rare literatures, which definitely should be resolved for further applications. Herein, we report a simple molecular design strategy construction pure-red by conjugate charge transfer, could greatly enhance π-conjugation degree and charge-transfer property target molecule while maintaining basic feature MR, leading significant redshift more than 128 nm compared selected parent core. The proof-of-concept emitter PPZ-BN exhibited emission dominant peak at 613 small full-width-at-half-maximum 0.16 eV (48 nm). optimized organic light-emitting diode showed high external quantum efficiency 26.9 %, roll-off, an excellent operation stability (LT99) 43 hours initial luminance 10 000 cd m-2 .
Language: Английский
Citations
53
Science Advances, Journal Year: 2023, Volume and Issue: 9(19)
Published: May 12, 2023
Stable deep blue multiresonance emitters with small full width at half maximum (FWHM) are attractive for wide color-gamut organic light-emitting diodes (OLEDs). However, the steric repulsion from spatially close hydrogens would twist skeletons, causing spectral broadening and molecular instability issues. Here, we strategically introduce a mesitylboron locking unit into carbazole-embedded model emitter, alleviating hydrogen repulsions also strengthening para-positioned weak carbon-nitrogen bond in anionic states. An emission peaking 452 nm an FWHM of merely 14 nearly BT.2020 chromaticity coordinates obtained toluene, affording high external quantum efficiency 33.9% sensitizing device. Moreover, impressive LT97 (time to decay 97% initial luminance) 178 hours constant current density 12 mA/cm2 was achieved stable device y coordinate 0.057, 20 times longer than emitter even substantially red-shifted emission.
Language: Английский
Citations
52
Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(18)
Published: Feb. 21, 2024
The intrinsic helical π-conjugated skeleton makes helicenes highly promising for circularly polarized electroluminescence (CPEL). Generally, carbon undergo low external quantum efficiency (EQE), while the incorporation of a multi-resonance thermally activated delayed fluorescence (MR-TADF) BN structure has led to an improvement. However, reported B,N-embedded all show dissymmetry factors (g
Language: Английский
Citations
50