The weak stability of a hole-transporter upon approaching the anion state is one of the major bottlenecks for developing long-life organic light-emitting devices (OLEDs). Therefore, in this study, we developed a series of thermally and electrically stable hole-transporters that are end-capped with four dibenzofuran units. These materials exhibit i) high bond dissociation energy (BDE) toward the anion state, ii) a high glass transition temperature (T >130 °C), and iii) high triplet energy (E >2.7 eV), thereby enabling approximately 20 % high external quantum efficiency (EQE) and significantly prolonging the stability of both thermally activated delayed fluorescent (TADF) and phosphorescent OLEDs with an operation lifetime at 50 % (LT ) of 20 000-30 000 h at 1000 cd m . In addition, investigating their structure-property relationship revealed that ionization potential (I ), BDE, and T are critical prerequisites for the hole-transporter to prolong lifetime in OLEDs.
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http://dx.doi.org/10.1002/chem.202104408 | DOI Listing |
Adv Mater
December 2024
Department of Chemistry, Pohang University of Science and Technology (POSTECH), 37673, Pohang, Republic of Korea.
Water is pursued as an electrolyte solvent for its non-flammable nature compared to traditional organic solvents, yet its narrow electrochemical stability window (ESW) limits its performance. Solvation chemistry design is widely adopted as the key to suppress the reactivity of water, thereby expanding the ESW. In this study, an acetamide-based ternary eutectic electrolyte achieved an ESW ranging from 1.
View Article and Find Full Text PDFAdv Sci (Weinh)
December 2024
Aiiso Yufeng Li Family Department of Nanoengineering, University of California San Diego, La Jolla, CA, 92093, USA.
Rechargeable Li-SO batteries offer low-cost, high-energy density benefits and can leverage manufacturing processes for the existing primary version at a commercial scale. However, they have so far only been demonstrated in an "open-system" with continuous gas supply, preventing practical application. Here, the utilization and reversibility of SO along with the lithium stability are addressed, all essential for long-life, high-energy batteries.
View Article and Find Full Text PDFAdv Mater
December 2024
Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.
Aqueous zinc-sulfur batteries are a high-capacity and cost-effective energy storage technology. However, the performance is plagued by the dissolution of intermediate polysulfides formed during conversion. Here, this issue is addressed by developing aqueous rechargeable Zn-sulfurized polyacrylonitrile (SPAN) batteries using tandem catalytic systems, containing water and tetraglyme (G4) with iodine (I) additives.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
October 2024
Jiangsu Key Laboratory of Materials and Technologies for Energy Storage, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China.
Nanomicro Lett
October 2024
School of Chemistry, South China Normal University, Guangzhou, 510006, People's Republic of China.
Porous organic cages (POCs) with permanent porosity and excellent host-guest property hold great potentials in regulating ion transport behavior, yet their feasibility as solid-state electrolytes has never been testified in a practical battery. Herein, we design and fabricate a quasi-solid-state electrolyte (QSSE) based on a POC to enable the stable operation of Li-metal batteries (LMBs). Benefiting from the ordered channels and cavity-induced anion-trapping effect of POC, the resulting POC-based QSSE exhibits a high Li transference number of 0.
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