Journal ArticleDOI
Population and decay of keto states in conjugated polymers
S.I. Hintschich,Carsten Rothe,Subrata Sinha,Andrew P. Monkman,P. Scandiucci de Freitas,Ullrich Scherf +5 more
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TLDR
Using time-resolved and steady-state photoluminescence techniques, fluorene/fluorenone copolymers have been studied to investigate the role of keto defects in degraded polyfluorene as mentioned in this paper.Abstract:
Using time-resolved and steady-state photoluminescence techniques, fluorene/fluorenone copolymers have been studied to investigate the role of keto defects in degraded polyfluorene. Keto sites can be populated via migration from polyfluorene singlets, thereby quenching the polyfluorene fluorescence, and via direct photon absorption. In the former case, the migration process dominates all thermal and interchain variability in the efficiency of quenching. No annihilation process of fluorenone triplets and no interchain processes such as excimer formation participate in the defect emission itself.read more
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Synthesis of Light-Emitting Conjugated Polymers for Applications in Electroluminescent Devices
TL;DR: School of Chemistry, Bio21 Institute, University of Melbourne, 30 Flemington Road, Victoria 3010, Australia; School of Materials Science and Engineering, Nanyang Technological University, Nastyang Avenue, Republic of Singapore 639798; Institute of Materials Research and Engineering (IMRE) and the Agency for Science, Technology and Research (A*STAR), 3 Research Link, Singapore 117602.
Journal ArticleDOI
Recent advances in white organic light-emitting materials and devices (WOLEDs).
TL;DR: The types of materials (small molecules and polymers) that have been used to fabricate WOLEDs are described and a range of device architectures are presented and appraised.
Journal ArticleDOI
Ultrahigh Efficiency Fluorescent Single and Bi-Layer Organic Light Emitting Diodes: The Key Role of Triplet Fusion
Chien-Jung Chiang,Alpay Kimyonok,Marc K. Etherington,Gareth C. Griffiths,Vygintas Jankus,Figen Turksoy,Andrew P. Monkman +6 more
TL;DR: In this article, a new family of anthracene core, highly fluorescent emitters is synthesized which include diphenylamine hole transport end groups, and triplet fusion can achieve a singlet production yield of 0.5.
Journal ArticleDOI
Room‐Temperature Phosphorescence From Films of Isolated Water‐Soluble Conjugated Polymers in Hydrogen‐Bonded Matrices
TL;DR: In this article, a method to fabricate solid films with densely packed noninteracting luminescent polymer chains, which yield very high photoluminescence quantum yield (PLQY) and more astonishingly room temperature phosphorescence, is reported.
Journal ArticleDOI
Exploiting a Dual‐Fluorescence Process in Fluorene–Dibenzothiophene‐S,S‐dioxideCo‐Polymers to Give Efficient Single Polymer LEDs with Broadened Emission
S. M. King,Irene I. Perepichka,Irene I. Perepichka,Igor F. Perepichka,Igor F. Perepichka,Fernando B. Dias,Martin R. Bryce,Andrew P. Monkman +7 more
TL;DR: In this article, a description of the synthesis of random (9,9-dioctylfluorene-2,7-diyl) co-polymers by palladium-catalyzed Suzuki cross-coupling polymerization where the feed ratio of the latter is varied from 2 to 30
References
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Book
Electronic Processes in Organic Crystals and Polymers
Martin Pope,Charles E. Swenberg +1 more
TL;DR: The first edition of the Electronic Processes of Organic Crystals, published in 1982, became the classic reference in the field and has been expanded to cover the major theoretical and experimental advances over the last fifteen years.
Journal ArticleDOI
Semiconducting Polyfluorenes—Towards Reliable Structure–Property Relationships
Ullrich Scherf,Emil List +1 more
TL;DR: In this paper, the authors focus on reliable structure-property relationships regarding substitution pattern, solid state morphology, and optical/electronic properties, and the key role of degradation-induced keto defect sites in fluorerse-type polymers and strategies for obtaining defect-free polyfluorenes.
Journal ArticleDOI
The Effect of Keto Defect Sites on the Emission Properties of Polyfluorene-Type Materials
Journal ArticleDOI
Interplay of Physical Structure and Photophysics for a Liquid Crystalline Polyfluorene
TL;DR: In this article, a structural model based on intrachain ordering was proposed to account for the changes of the absorption spectrum of poly(9,9-dioctylfluorene) (PFO) films under certain physicochemical treatment protocols.
Journal ArticleDOI
Polyfluorenes with Polyphenylene Dendron Side Chains: Toward Non-Aggregating, Light-Emitting Polymers
Sepas Setayesh,Andrew C. Grimsdale,Tanja Weil,Volker Enkelmann,Klaus Müllen,Farideh Meghdadi,Emil List,Günther Leising +7 more
TL;DR: A polyfluorene 12 has been prepared in which bulky polyphenylene dendrimer substituents suppress formation of long wavelength emitting aggregates, thus giving a polymer with pure blue emission.
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