Ancillary ligand-assisted robust deep-red emission in iridium(<scp>iii</scp>) complexes for solution-processable phosphorescent OLEDs

Kim, Hae Un; Jang, Ho Jin; Choi, Wonchang; Kim, Minjun; Park, Sung Jin; Park, Jin Young; Lee, Jun Yeob; Bejoymohandas, K. S.

doi:10.1039/c9tc00805e

Cited by 34 publications

(28 citation statements)

References 80 publications

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“…Among the various metal sulfides, iron sulfides have proven to be appealing to SIBs, owing to their high theoretical capacity (≈610 mAh g −1 for FeS), natural abundance and low toxicity. However, they also show inferior electrochemical properties owing to their sluggish kinetics and severe volume changes during repeated cycling …”

Section: Introductionmentioning

confidence: 99%

Promoting Highly Reversible Sodium Storage of Iron Sulfide Hollow Polyhedrons via Cobalt Incorporation and Graphene Wrapping

Huang

Fan

Xie

et al. 2019

Advanced Energy Materials

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Sodium ion batteries (SIBs) have drawn significant attention owing to their low cost and inherent safety. However, the absence of suitable anode materials with high rate capability and long cycling stability is the major challenge for the practical application of SIBs. Herein, an efficient anode material consisting of uniform hollow iron sulfide polyhedrons with cobalt doping and graphene wrapping (named as CoFeS@rGO) is developed for high‐rate and long‐life SIBs. The graphene‐encapsulated hollow composite assures fast and continuous electron transportation, high Na+ ion accessibility, and strong structural integrity, showing an extremely small volume expansion of only 14.9% upon sodiation and negligible volume contraction during the desodiation. The CoFeS@rGO electrode exhibits high specific capacity (661.9 mAh g−1 at 100 mA g−1), excellent rate capability (449.4 mAh g−1 at 5000 mA g−1), and long cycle life (84.8% capacity retention after 1500 cycles at 1000 mA g−1). In situ X‐ray diffraction and selected‐area electron diffraction patterns show that this novel CoFeS@rGO electrode is based on a reversible conversion reaction. More importantly, when coupled with a Na3V2(PO4)3/C cathode, the sodium ion full battery delivers a superexcellent rate capability (496.8 mAh g−1 at 2000 mA g−1) and ≈96.5% capacity retention over 200 cycles at 500 mA g−1 in the 1.0–3.5 V window. This work indicates that the rationally designed anode material is highly applicable for the next generation SIBs with high‐rate capability and long‐term cyclability.

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Section: Introductionmentioning

confidence: 99%

Promoting Highly Reversible Sodium Storage of Iron Sulfide Hollow Polyhedrons via Cobalt Incorporation and Graphene Wrapping

Huang

Fan

Xie

et al. 2019

Advanced Energy Materials

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“…Another effective strategy is the use of hollow and/or porous MoSe 2 ‐based electrode materials. The empty space in such structures could shorten the diffusion length of Na + and accommodate the mechanical stress upon cycling, thereby improving the cycling stability and rate capability . In particular, a 1 D tubular structure, regarded as a unique hollow structure, is favorable for electron/ion transport and contact between electrode and electrolyte owing to an enhanced surface‐to‐volume ratio and short transport length …”

Section: Introductionmentioning

confidence: 69%

“…Three peaks in the Mo 3d spectrum at 229.1, 230.6, and 232.2 eV were assigned to Mo 3d 5/2 , Se 3s, and Mo 3d 3/2 , respectively (Figure c). The peak position for Mo 3d 3/2 and Mo 3d 5/2 suggested an oxidation state of Mo 4+ , verifying the formation of MoSe 2 . The Se 3d spectrum could be deconvoluted into three different peaks at 54.6, 55.5, and 56.4 eV, representing Se 3d 5/2 , Se 3d 3/2 , and Se−Se, respectively (Figure d) .…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Tubular‐Structured MoSe₂ Nanosheets/N‐Doped Carbon Nanocomposite with Enhanced Sodium Storage Properties

et al. 2019

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Intimately coupled carbon/molybdenum‐based hierarchical nanostructures are promising anodes for high‐performance sodium‐ion batteries owing to the combined effects of the two components and their robust structural stability. Mo–polydopamine (PDA) complexes are appealing precursors for the preparation of various Mo‐based nanostructures containing N‐doped carbon (NC). A facile method for the fabrication of hierarchical tubular nanocomposites with intimately coupled MoSe2 and NC nanosheets has been developed, which involves the preparation of Mo–PDA hybrid nanotubes through a chemical route followed by two heat treatments. The strong coupling between Mo anions and the catechol groups in dopamine not only restricts the crystallite size but also inhibits agglomeration during selenization, resulting in few‐layered MoSe2 nanosheets embedded in hierarchical NC substrates. The as‐synthesized nanotube composites are constructed by assembling primary MoSe2/NC nanosheets. This unique structure not only increases the number of active sites but also shortens the diffusion length of ions and enhances the electronic conductivity of electrode materials. The as‐synthesized hierarchical MoSe2/NC nanotubes deliver a high capacity of 429 mAh g−1 at 1 A g−1 after the 150th cycle when used as anodes in sodium‐ion batteries. Furthermore, at a high current density of 10 A g−1, a high discharge capacity of 236 mAh g−1 is achieved.

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“…Kim et al. used NaCl as a washable template to produce metal sulfide/carbon microspheres with cubic nanorooms (MeS x /C‐NR; Figure a) . The authors reported that this method can be generalized for the synthesis of any metal sulfide/carbon composites, such as MoS 2 /C‐NR, SnS/C‐NR, and FeS 2 /C‐NR (Figure b–h).…”

Section: Synthesis Of Metal Chalcogenide Materials By Aerosol‐assistementioning

confidence: 99%

Section: Synthesis Of Metal Chalcogenide Materials By Aerosol‐assistementioning

confidence: 99%

Recent Advances in Aerosol‐Assisted Spray Processes for the Design and Fabrication of Nanostructured Metal Chalcogenides for Sodium‐Ion Batteries

Kim

Jeong

Lim

et al. 2019

Chemistry An Asian Journal

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Increasing demand for sodium‐ion batteries (SIBs), one of the most feasible alternatives to lithium ion batteries (LIBs), has resulted because of their high energy density, low cost, and excellent cycling stability. Consequently, the design and fabrication of suitable electrode materials that govern the overall performance of SIBs are important. Aerosol‐assisted spray processes have gained recent prominence as feasible, scalable, and cost‐effective methods for preparing electrode materials. Herein, recent advances in aerosol‐assisted spray processes for the fabrication of nanostructured metal chalcogenides (e.g., metal sulfides, selenides, and tellurides) for SIBs, with a focus on improving the electrochemical performance of metal chalcogenides, are summarized. Finally, the improvements, limitations, and direction of future research into aerosol‐assisted spray processes for the fabrication of various electrode materials are presented.

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Ancillary ligand-assisted robust deep-red emission in iridium(iii) complexes for solution-processable phosphorescent OLEDs

Abstract: Two different kinds of ancillary ligands such as picolinate and thenoyltrifluoroacetylacetonate have profound effects on the excited state properties of deep red emissive iridium(iii) complexes

Cited by 34 publications

References 80 publications

Promoting Highly Reversible Sodium Storage of Iron Sulfide Hollow Polyhedrons via Cobalt Incorporation and Graphene Wrapping

Promoting Highly Reversible Sodium Storage of Iron Sulfide Hollow Polyhedrons via Cobalt Incorporation and Graphene Wrapping

Hierarchical Tubular‐Structured MoSe₂ Nanosheets/N‐Doped Carbon Nanocomposite with Enhanced Sodium Storage Properties

Recent Advances in Aerosol‐Assisted Spray Processes for the Design and Fabrication of Nanostructured Metal Chalcogenides for Sodium‐Ion Batteries

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Ancillary ligand-assisted robust deep-red emission in iridium(iii) complexes for solution-processable phosphorescent OLEDs

Abstract: Two different kinds of ancillary ligands such as picolinate and thenoyltrifluoroacetylacetonate have profound effects on the excited state properties of deep red emissive iridium(iii) complexes

Cited by 34 publications

References 80 publications

Promoting Highly Reversible Sodium Storage of Iron Sulfide Hollow Polyhedrons via Cobalt Incorporation and Graphene Wrapping

Promoting Highly Reversible Sodium Storage of Iron Sulfide Hollow Polyhedrons via Cobalt Incorporation and Graphene Wrapping

Hierarchical Tubular‐Structured MoSe2 Nanosheets/N‐Doped Carbon Nanocomposite with Enhanced Sodium Storage Properties

Recent Advances in Aerosol‐Assisted Spray Processes for the Design and Fabrication of Nanostructured Metal Chalcogenides for Sodium‐Ion Batteries

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Hierarchical Tubular‐Structured MoSe₂ Nanosheets/N‐Doped Carbon Nanocomposite with Enhanced Sodium Storage Properties