Pure hydrocarbon (PHC) materials are a class of highly efficient and stable host materials for organic light-emitting diodes (OLEDs), composed solely of carbon and hydrogen atoms. Despite recent great advancements in PHC research, their applications are still mainly limited to phosphorescent OLEDs (PHOLEDs). Thus, expanding PHC materials into other types of OLEDs is critical for advancing organic electronics. In this study, we designed a series of high-triplet PHC materials based on a multi-substitution approach of the 9,9'-spirobifluorene (SBF) backbone and used them, for the first time, as host in blue-emitting phosphorescence-sensitized multi-resonance thermally activated delayed fluorescence (MR-TADF) OLEDs. Devices based on 2,6-Bis(3,6-di-tert-butyl-9H-carbazol-9-yl)boron (DtBuCzB) emitter, using FIrpic or fac-Ir(tpz)3 as the sensitizer, achieved high maximum external quantum efficiency (EQEmax) values ranging from 29.1% to 33.9%. Additionally, blue MR-TADF OLED devices based on v-DABNA with a phosphorescent sensitizer (CN-Ir), demonstrated outstanding electroluminescent performance, with EQEmax of approximately 31% notably due to an excellent molecular orientation induced by the PHC hosts. All devices exhibited narrow full-width at half-maximum spectra and minimal efficiency roll-off. This study marks the first application of PHC hosts in phosphorescence-sensitized MR-TADF OLEDs, highlighting their potential as promising candidates for the next-generation of blue OLEDs.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/anie.202501895 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
B(CF)-Regulated Selectivity of Aryl Alkene Hydrosilylation Catalyzed by a [P,C]-Chelate Cobalt(I) Complex.
Inorg Chem
March 2025
School of Chemistry and Chemical Engineering, Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Shanda Nanlu 27, 250100 Jinan, People's Republic of China.
In this article, two cobalt complexes bearing bidentate ligands, [Si,C]-chelate cobalt(I) complex [(Si,C)Co(PMe)] () and [P,C]-chelate cobalt(I) complex [(P,C)Co(PMe)] () were synthesized by activating Csp-H of the corresponding 2-(diphenylsilylenoaminomethyl) pyridine () PyN(Me)SiL (L = PhC(NBu)) or 2-(diphenylphosphinoaminomethyl) pyridine () PyN(Me)PPh with CoMe(PMe). The catalytic performance of complexes and for alkene hydrosilylation was studied. Because of the different electronic properties of the phosphine and the silylene pincer ligand, the catalytic effect of phosphine complex is superior to that of silylene complex as indicated by faster conversion and higher selectivity for most of the selected substrates.
View Article and Find Full Text PDFIt is generally accepted that the bound states in the continuum (BICs) are usually realized in a one-dimensional system by the TM-polarized light incident at Brewster's angle. However, the optimal BICs can be achieved only under specific incident light and at a specific polarization incident angle, which poses challenges to its experimental implementation. Serving this purpose, we design a system composed of an anisotropic material (AM) embedded in one-dimensional photonic crystals (1D-PhCs), demonstrating that both TE and TM waves can realize BICs.
View Article and Find Full Text PDFLithium Anionic Dicarbenes or Acetylides: What is in the Name?
Angew Chem Int Ed Engl
February 2025
Molecular Inorganic Chemistry and Catalysis, Inorganic and Structural Chemistry, Center for Molecular Materials, Faculty of Chemistry, Universität Bielefeld, Universitätsstrasse 25, D-33615, Bielefeld, Germany.
The two-fold deprotonation of the C2-arylated 1,3-imidazolium salts (IPr-Ar)X (1-Ar)X (IPr-Ar = ArC{N(Dipp)CH}; Ar = Ph, 4-MeNCH (DMP) or 4-PhCH (Bp); Dipp = 2,6-iPrCH) with nBuLi affords the so-called anionic dicarbenes Li(ADC) (2-Ar) (ADC = ArC{N(Dipp)C}). 2-Ar can be used to prepare a variety of main group heterocycles, however their structures in the solid-state remained hitherto unknown. Herein reported single-crystal X-ray diffraction studies reveal an acetylide type [ArC{N(Dipp)}(Dipp)NC≡CLi)] (3-Ar) dimeric (n = 2) or trimeric (n = 3) molecular structure for 2-Ar.
View Article and Find Full Text PDFPure Hydrocarbon Hosts Enabling Efficient Multi-Resonance TADF Blue-Emitting Organic Light-Emitting Diodes.
Angew Chem Int Ed Engl
February 2025
Institute of Chemical Sciences Rennes, Dpt. de Chimie, campus de Beaulieu, 35042 Rennes cedex, Rennes, FRANCE.
Pure hydrocarbon (PHC) materials are a class of highly efficient and stable host materials for organic light-emitting diodes (OLEDs), composed solely of carbon and hydrogen atoms. Despite recent great advancements in PHC research, their applications are still mainly limited to phosphorescent OLEDs (PHOLEDs). Thus, expanding PHC materials into other types of OLEDs is critical for advancing organic electronics.
View Article and Find Full Text PDFEducational interventions delivered to prescribing advisers to influence primary care prescribing: a very low-cost pragmatic randomised trial using routine data from OpenPrescribing.net.
BMC Health Serv Res
February 2025
Nuffield Department of Primary Care Health Sciences, The Bennett Institute for Applied Data Science, University of Oxford, Oxford, OX2 6GG, UK.
Background: NHS England issued commissioning guidance on 18 low-priority treatments which should not be routinely prescribed in primary care. We aimed to monitor the impact of an educational intervention delivered to regional prescribing advisors by senior pharmacists from NHS England on the primary care spend on low-priority items.
Methods: An opportunistic randomised, controlled parallel-group trial.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!