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  • Wiley  (18)
  • 1
    Online Resource
    Online Resource
    Regulation of Multiple Resonance Delayed Fluorescence via Through‐Space Charge Transfer Excited State towards High‐Efficiency and Stable Narrowband Electroluminescence
    Wiley ; 2023
    In:  Angewandte Chemie International Edition Vol. 62, No. 49 ( 2023-12-04)
    Details
    In: Angewandte Chemie International Edition, Wiley, Vol. 62, No. 49 ( 2023-12-04)
    Abstract: B‐ and N‐embedded multiple resonance (MR) type thermally activated delayed fluorescence (TADF) emitters usually suffer from slow reverse intersystem crossing (RISC) process and aggregation‐caused emission quenching. Here, we report the design of a sandwich structure by placing the B−N MR core between two electron‐donating moieties, inducing through‐space charge transfer (TSCT) states. The proper adjusting of the energy levels brings about a 10‐fold higher RISC rate in comparison with the parent B−N molecule. In the meantime, a high photoluminescence quantum yield of 91 % and a good color purity were maintained. Organic light‐emitting diodes based on the new MR emitter achieved a maximum external quantum efficiency of 31.7 % and small roll‐offs at high brightness. High device efficiencies were also obtained for a wide range of doping concentrations of up to 20 wt % thanks to the steric shielding of the B−N core. A good operational stability with LT 95 of 85.2 h has also been revealed. The dual steric and electronic effects resulting from the introduction of a TSCT state offer an effective molecular design to address the critical challenges of MR‐TADF emitters.
    Type of Medium: Online Resource
    ISSN: 1433-7851 , 1521-3773
    URL: Issue
    URL: Article
    DOI: 10.1002/anie.v62.49
    DOI: 10.1002/anie.202310943
    RVK:
    VA 2100
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2011836-3
    detail.hit.zdb_id: 123227-7
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  • 2
    Online Resource
    Online Resource
    Metal‐Perturbed Multiresonance TADF Emitter Enables High‐Efficiency and Ultralow Efficiency Roll‐Off Nonsensitized OLEDs with Pure Green Gamut
    Wiley ; 2023
    In:  Advanced Materials Vol. 35, No. 6 ( 2023-02)
    Details
    In: Advanced Materials, Wiley, Vol. 35, No. 6 ( 2023-02)
    Abstract: Multiresonance (MR)‐induced thermally activated delayed fluorescence (TADF) emitters based on B‐ and N‐embedded polycyclic aromatics are desirable for ultrahigh‐definition organic light‐emitting diodes (OLEDs) due to their high photoluminescence quantum yield (PLQY) and narrow bandwidth. But the reverse intersystem crossing (RISC) rates of MR‐TADF emitters are usually small, resulting in severe device efficiency roll‐off at high brightness. To solve this issue, a sensitizer for the MR‐TADF emitter has been required. Herein, a new MR‐TADF emitter is developed through coordination of Au with B/N‐embedded polycyclic ligand. Benefitting from the Au perturbation, the RISC rate is dramatically accelerated to 2.3 × 10 7 s −1 , leading to delayed fluorescence lifetime as short as 4.3 µs. Meanwhile, the PLQY of 95% and full width at half maximum of 39 nm (0.18 eV) are essentially unchanged after metal coordination. Therefore, a high PLQY, short delayed fluorescence lifetime, and high color purity are concurrently realized in a single TADF emitter. Accordingly, vacuum‐deposited OLEDs exhibit high‐performance electroluminescence with a maximum external quantum efficiency (EQE) of 35.8% without sensitization. The EQE is maintained as high as 32.3% at 10 000 cd m −2 . Furthermore, solution‐processed OLED based on the emitter also achieves excellent performance with a maximum EQE of 25.7% and a small efficiency roll‐off.
    Type of Medium: Online Resource
    ISSN: 0935-9648 , 1521-4095
    URL: Issue
    URL: Article
    DOI: 10.1002/adma.v35.6
    DOI: 10.1002/adma.202208378
    RVK:
    UA 1538
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 1474949-X
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  • 3
    Online Resource
    Online Resource
    Au⋅⋅⋅H−C Interactions Support a Robust Thermally Activated Delayed Fluorescence (TADF) Gold(I) Complex for OLEDs with Little Efficiency Roll‐Off and Good Stability
    Wiley ; 2022
    In:  Angewandte Chemie International Edition Vol. 61, No. 40 ( 2022-10-04)
    Details
    In: Angewandte Chemie International Edition, Wiley, Vol. 61, No. 40 ( 2022-10-04)
    Abstract: The practical use of luminescent mononuclear gold(I) complexes as optoelectronic materials has been limited by their inferior stability. Herein we demonstrate a strategy to improve the stability of gold(I) complexes which display thermally activated delayed fluorescence (TADF). A highly rigid and groove‐like σ‐donating aryl ligand has been used to form dual Au⋅⋅⋅H−C hydrogen bonds. The secondary metal‐ligand interactions have been authenticated by single‐crystal structure, NMR spectroscopy and theoretical simulations. The TADF Au I complex exhibits appealing emission properties (photoluminescence quantum yield=76 %; delayed fluorescence lifetime=1.2 μs) and much improved thermal and photo‐stability. Vacuum‐deposited organic light‐emitting diodes (OLEDs) show promising electroluminescence with a maximum external quantum efficiency (EQE) over 23 % and negligible efficiency roll‐off even at 10 000 cd m −2 . An estimated LT 50 longer than 77 000 h with initial luminance of 100 cd m −2 reveals good operational stability. This work suggests a way for design of stable luminescent gold(I) complexes.
    Type of Medium: Online Resource
    ISSN: 1433-7851 , 1521-3773
    URL: Issue
    URL: Article
    DOI: 10.1002/anie.v61.40
    DOI: 10.1002/anie.202209451
    RVK:
    VA 2100
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2011836-3
    detail.hit.zdb_id: 123227-7
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Au⋅⋅⋅H−C Interactions Support a Robust Thermally Activated Delayed Fluorescence (TADF) Gold(I) Complex for OLEDs with Little Efficiency Roll‐Off and Good Stability
    Wiley ; 2022
    In:  Angewandte Chemie Vol. 134, No. 40 ( 2022-10-04)
    Details
    In: Angewandte Chemie, Wiley, Vol. 134, No. 40 ( 2022-10-04)
    Abstract: The practical use of luminescent mononuclear gold(I) complexes as optoelectronic materials has been limited by their inferior stability. Herein we demonstrate a strategy to improve the stability of gold(I) complexes which display thermally activated delayed fluorescence (TADF). A highly rigid and groove‐like σ‐donating aryl ligand has been used to form dual Au⋅⋅⋅H−C hydrogen bonds. The secondary metal‐ligand interactions have been authenticated by single‐crystal structure, NMR spectroscopy and theoretical simulations. The TADF Au I complex exhibits appealing emission properties (photoluminescence quantum yield=76 %; delayed fluorescence lifetime=1.2 μs) and much improved thermal and photo‐stability. Vacuum‐deposited organic light‐emitting diodes (OLEDs) show promising electroluminescence with a maximum external quantum efficiency (EQE) over 23 % and negligible efficiency roll‐off even at 10 000 cd m −2 . An estimated LT 50 longer than 77 000 h with initial luminance of 100 cd m −2 reveals good operational stability. This work suggests a way for design of stable luminescent gold(I) complexes.
    Type of Medium: Online Resource
    ISSN: 0044-8249 , 1521-3757
    URL: Issue
    URL: Article
    DOI: 10.1002/ange.v134.40
    DOI: 10.1002/ange.202209451
    RVK:
    VA 2100
    RVK:
    VN 5020
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 505868-5
    detail.hit.zdb_id: 506609-8
    detail.hit.zdb_id: 514305-6
    detail.hit.zdb_id: 505872-7
    detail.hit.zdb_id: 1479266-7
    detail.hit.zdb_id: 505867-3
    detail.hit.zdb_id: 506259-7
    Location Call Number Limitation Availability
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    Online Resource
  • 5
    Online Resource
    Online Resource
    Regulation of Multiple Resonance Delayed Fluorescence via Through‐Space Charge Transfer Excited State towards High‐Efficiency and Stable Narrowband Electroluminescence
    Wiley ; 2023
    In:  Angewandte Chemie Vol. 135, No. 49 ( 2023-12-04)
    Details
    In: Angewandte Chemie, Wiley, Vol. 135, No. 49 ( 2023-12-04)
    Abstract: B‐ and N‐embedded multiple resonance (MR) type thermally activated delayed fluorescence (TADF) emitters usually suffer from slow reverse intersystem crossing (RISC) process and aggregation‐caused emission quenching. Here, we report the design of a sandwich structure by placing the B−N MR core between two electron‐donating moieties, inducing through‐space charge transfer (TSCT) states. The proper adjusting of the energy levels brings about a 10‐fold higher RISC rate in comparison with the parent B−N molecule. In the meantime, a high photoluminescence quantum yield of 91 % and a good color purity were maintained. Organic light‐emitting diodes based on the new MR emitter achieved a maximum external quantum efficiency of 31.7 % and small roll‐offs at high brightness. High device efficiencies were also obtained for a wide range of doping concentrations of up to 20 wt % thanks to the steric shielding of the B−N core. A good operational stability with LT 95 of 85.2 h has also been revealed. The dual steric and electronic effects resulting from the introduction of a TSCT state offer an effective molecular design to address the critical challenges of MR‐TADF emitters.
    Type of Medium: Online Resource
    ISSN: 0044-8249 , 1521-3757
    URL: Issue
    URL: Article
    DOI: 10.1002/ange.v135.49
    DOI: 10.1002/ange.202310943
    RVK:
    VA 2100
    RVK:
    VN 5020
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 505868-5
    detail.hit.zdb_id: 506609-8
    detail.hit.zdb_id: 514305-6
    detail.hit.zdb_id: 505872-7
    detail.hit.zdb_id: 1479266-7
    detail.hit.zdb_id: 505867-3
    detail.hit.zdb_id: 506259-7
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    Online Resource
  • 6
    Online Resource
    Online Resource
    Organic Thermally Activated Delayed Fluorescence Materials for Time‐Resolved Luminescence Imaging and Sensing
    Wiley ; 2020
    In:  Advanced Optical Materials Vol. 8, No. 14 ( 2020-07)
    Details
    In: Advanced Optical Materials, Wiley, Vol. 8, No. 14 ( 2020-07)
    Abstract: As one of the most attractive purely organic luminescent materials, thermally activated delayed fluorescence (TADF) luminophores have drawn wide attention in the last decade. The long‐lived delayed fluorescence resulting from the reverse intersystem crossing from excited triplet state (T 1 ) to excited singlet state (S 1 ) in the TADF luminophores gives rise to long lifetimes ranging from nanoseconds to milliseconds, which offers a new strategy for time‐resolved luminescence imaging (TRLI) and sensing. However, the sensitivity of the T 1 state in TADF luminophores to triplet oxygen remains a significant challenge for their application. This progress report summarizes the recent developments of efficient purely organic TADF luminophores and novel aggregation‐induced delayed fluorescence (AIDF) luminophores for TRLI and sensing in vitro and in vivo. The molecular design strategies, photophysical properties of the luminophores, and their application in specific imaging and sensing within the time domain are presented. Newly emerged organic materials with AIDF behavior open a new door for developing long‐lived emitters for high signal‐to‐noise ratio (SNR) imaging and sensing in the oxygenic atmosphere.
    Type of Medium: Online Resource
    ISSN: 2195-1071 , 2195-1071
    URL: Issue
    URL: Article
    DOI: 10.1002/adom.v8.14
    DOI: 10.1002/adom.201902187
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2708158-8
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  • 7
    Online Resource
    Online Resource
    Chiral Multi‐Resonance TADF Emitters Exhibiting Narrowband Circularly Polarized Electroluminescence with an EQE of 37.2 %
    Wiley ; 2022
    In:  Angewandte Chemie Vol. 134, No. 30 ( 2022-07-25)
    Details
    In: Angewandte Chemie, Wiley, Vol. 134, No. 30 ( 2022-07-25)
    Abstract: Highly efficient circularly polarized luminescence (CPL) emitters with narrowband emission remain a formidable challenge for circularly polarized OLEDs (CP‐OLEDs). Here, a promising strategy for developing chiral emitters concurrently featuring multi‐resonance thermally activated delayed fluorescence (MR‐TADF) and circularly polarized electroluminescence (CPEL) is demonstrated by the integration of molecular rigidity, central chirality and MR effect. A pair of chiral green emitters denoted as ( R )‐ BN‐MeIAc and ( S )‐ BN‐MeIAc is designed. Benefited by the rigid and quasi‐planar MR‐framework, the enantiomers not only display mirror‐image CPL spectra, but also exhibit TADF properties with a high photoluminescence quantum yield of 96 %, a narrow FWHM of 30 nm, and a high horizontal dipole orientation of 90 % in the doped film. Consequently, the enantiomer‐based CP‐OLEDs achieved excellent external quantum efficiencies of 37.2 % with very low efficiency roll‐off, representing the highest device efficiency of all the reported CP‐OLEDs.
    Type of Medium: Online Resource
    ISSN: 0044-8249 , 1521-3757
    URL: Issue
    URL: Article
    DOI: 10.1002/ange.v134.30
    DOI: 10.1002/ange.202202227
    RVK:
    VA 2100
    RVK:
    VN 5020
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 505868-5
    detail.hit.zdb_id: 506609-8
    detail.hit.zdb_id: 514305-6
    detail.hit.zdb_id: 505872-7
    detail.hit.zdb_id: 1479266-7
    detail.hit.zdb_id: 505867-3
    detail.hit.zdb_id: 506259-7
    Location Call Number Limitation Availability
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    Online Resource
  • 8
    Online Resource
    Online Resource
    Chiral Multi‐Resonance TADF Emitters Exhibiting Narrowband Circularly Polarized Electroluminescence with an EQE of 37.2 %
    Wiley ; 2022
    In:  Angewandte Chemie International Edition Vol. 61, No. 30 ( 2022-07-25)
    Details
    In: Angewandte Chemie International Edition, Wiley, Vol. 61, No. 30 ( 2022-07-25)
    Abstract: Highly efficient circularly polarized luminescence (CPL) emitters with narrowband emission remain a formidable challenge for circularly polarized OLEDs (CP‐OLEDs). Here, a promising strategy for developing chiral emitters concurrently featuring multi‐resonance thermally activated delayed fluorescence (MR‐TADF) and circularly polarized electroluminescence (CPEL) is demonstrated by the integration of molecular rigidity, central chirality and MR effect. A pair of chiral green emitters denoted as ( R )‐ BN‐MeIAc and ( S )‐ BN‐MeIAc is designed. Benefited by the rigid and quasi‐planar MR‐framework, the enantiomers not only display mirror‐image CPL spectra, but also exhibit TADF properties with a high photoluminescence quantum yield of 96 %, a narrow FWHM of 30 nm, and a high horizontal dipole orientation of 90 % in the doped film. Consequently, the enantiomer‐based CP‐OLEDs achieved excellent external quantum efficiencies of 37.2 % with very low efficiency roll‐off, representing the highest device efficiency of all the reported CP‐OLEDs.
    Type of Medium: Online Resource
    ISSN: 1433-7851 , 1521-3773
    URL: Issue
    URL: Article
    DOI: 10.1002/anie.v61.30
    DOI: 10.1002/anie.202202227
    RVK:
    VA 2100
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2011836-3
    detail.hit.zdb_id: 123227-7
    Location Call Number Limitation Availability
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    Online Resource
  • 9
    Online Resource
    Online Resource
    Host‐Dopant Interaction between Organic Thermally Activated Delayed Fluorescence Emitter and Host Material: Insight into the Excited State
    Wiley ; 2022
    In:  Advanced Optical Materials Vol. 10, No. 1 ( 2022-01)
    Details
    In: Advanced Optical Materials, Wiley, Vol. 10, No. 1 ( 2022-01)
    Abstract: Organic light‐emitting diodes (OLEDs) represent one of the most promising technologies for future displays and lighting sources, which have received extensive research attention. Purely organic thermally activated delayed fluorescence (TADF) emitters offer obvious advantages, including high efficiencies and low costs, and they are typically doped in host materials to achieve optimal device efficiencies. TADF emitters typically feature intramolecular charge transfer characteristics, and their excited states properties are sensitive to local environment, giving the implication that host materials can finely tune their emission properties. In recent years, the development of TADF emitters has been vigorous with abundant and fast‐growing reports on new design concepts and molecular structures. Comparatively, research on the host materials for TADF OLEDs has lagged, and reports on host materials, especially those providing insights into host‐dopant interactions are limited. This subject is at the interface of synthetic chemistry, physical chemistry, solid‐state physics, and computational modeling, etc. In this review article, current basic understanding of TADF and the reports on the impact of host materials on the photophysical properties/device performance of TADF emitters are reviewed to provide insights into the host‐dopant interactions, aiming to draw the attention of the research community from optoelectronics toward developing highly efficient TADF OLEDs.
    Type of Medium: Online Resource
    ISSN: 2195-1071 , 2195-1071
    URL: Issue
    URL: Article
    DOI: 10.1002/adom.v10.1
    DOI: 10.1002/adom.202101343
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2708158-8
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  • 10
    Online Resource
    Online Resource
    Pyrene‐functionalized oligofluorenes as non‐doped deep blue emitters for solution‐processed organic light‐emitting diodes
    Wiley ; 2016
    In:  Journal of Polymer Science Part A: Polymer Chemistry Vol. 54, No. 6 ( 2016-03-15), p. 795-801
    Details
    In: Journal of Polymer Science Part A: Polymer Chemistry, Wiley, Vol. 54, No. 6 ( 2016-03-15), p. 795-801
    Abstract: Two pyrene‐functionalized oligofluorenes (TPA‐PyF 3 and CBP‐PyF 3 ) are prepared using the condensation reaction by the Friedel–Crafts procedure. In the produced oligomers, the triphenylamine or N , N ′‐dicarbazolyl‐4,4′‐biphenyl core serves as a spacer bearing spiro‐linked fluorene moieties to form a multi‐H shaped structure. This specific structure efficiently retards the crystallization tendency of the pyrene groups, and gives the materials completely amorphous morphological structure and film forming ability. Solution‐processed OLEDs with the structure of ITO/PEDOT:PSS (25 nm)/TPA‐PyF 3 or CBP‐PyF 3 (40 nm)/TPBI (35 nm)/Ca (10 nm)/Ag (100 nm) show low turn‐on voltages of 3.6 V, and the maximum external quantum efficiencies reach 1.78% and 2.07% for TPA‐PyF 3 and CBP‐PyF 3, respectively. Moreover, both devices exhibit stable deep‐blue light emission with Commission International de I'Eclairage (CIE) coordinates of around (0.16, 0.09) at the brightness of 100–1000 cd m −2 . © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54 , 795–801
    Type of Medium: Online Resource
    ISSN: 0887-624X , 1099-0518
    URL: Issue
    URL: Article
    DOI: 10.1002/pola.v54.6
    DOI: 10.1002/pola.27913
    Language: English
    Publisher: Wiley
    Publication Date: 2016
    detail.hit.zdb_id: 3004641-5
    detail.hit.zdb_id: 1473076-5
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