Journal ArticleDOI
High-Performance Organic Light-Emitting Diodes Based on Dioxolane-Substituted Pentacene Derivatives†
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TLDR
In this article, an organic light-emitting diodes (OLEDs) with red-light emitting dioxolane-substituted pentacene derivatives are fabricated and characterized.Abstract:
Organic light-emitting diodes (OLEDs) containing red-light-emitting dioxolane-substituted pentacene derivatives are fabricated and characterized. The OLEDs feature guest–host emitting layers consisting of either 6,14-bis(triisopropylsilylethynyl)-1,3,9,11-tetraoxa-dicyclopenta[b,m]pentacene (TP-5) or 2,2,10,10-tetraethyl-6,14-bis(triisopropylsilylethynyl)-1,3,9,11-tetraoxa-dicyclopenta[b,m]pentacene (EtTP-5) dispersed in tris(quinolin-8-olato) aluminum(III) (Alq3). High external electroluminescence (EL) quantum efficiency (ηEL = 3.3 %), not far from the theoretical limit, is observed for an OLED device based on a dilute EtTP-5:Alq3 emitting layer (0.25 mol % EtTP-5). The proposed EL mechanism is a combination of Forster energy transfer and direct electron–hole recombination on the guest pentacene molecules, as inferred by changes in the EL versus photoluminescence spectra and the positions of the highest occupied molecular orbital and lowest unoccupied molecular orbital gap of the guest within that of the host (estimated via cyclic voltammetry). Further evidence of charge trapping is provided by increased operational voltages at increased guest-molecule concentration.read more
Citations
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Journal ArticleDOI
The larger acenes: versatile organic semiconductors.
TL;DR: New approaches to add functionality were developed to improve the processability of these materials in solution, allowing the synthesis of acenes larger than pentacene, which have hitherto been largely unavailable and poorly studied.
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Höhere Acene: vielseitige organische Halbleiter
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Theory of excited state decays and optical spectra: application to polyatomic molecules.
TL;DR: The present approach appears to be an effective tool to obtain a quantitative description and detailed understanding of spectra and photophysical processes in polyatomic molecules and to extend the application scope of the internal conversion theory by going beyond the promoting-mode approximation.
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Synthesis, Luminescence Properties, and Explosives Sensing with 1,1-Tetraphenylsilole- and 1,1-Silafluorene-vinylene Polymers
TL;DR: In this paper, the syntheses, spectroscopic characterizations, and fluorescence quenching efficiencies of polymers and copolymers containing tetraphenyl-silole- or silafluorene-vinylene repeat units are reported.
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Beyond traditional light-emitting electrochemical cells – a review of new device designs and emitters
TL;DR: In the field of solid-state lighting (SSL) technologies, light-emitting electrochemical cells (LECs) are the leading example of easy-to-fabricate and simple-architecture devices as mentioned in this paper.
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10th Spiers Memorial Lecture. Transfer mechanisms of electronic excitation
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Highly phosphorescent bis-cyclometalated iridium complexes: synthesis, photophysical characterization, and use in organic light emitting diodes.
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