Journal ArticleDOI
Controlling the Chromaticity of Small‐Molecule Light‐Emitting Electrochemical Cells Based on TIPS‐Pentacene
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TLDR
In this paper, a photo-induced cycloaddition process of the 6,13-bis (triisopropylsilylethynyl) (TIPS)-pentacene is used to generate a high-energy emission.Abstract:
This work demonstrates a novel proof-of-concept to implement pentacene derivatives as emitters for the third generation of light-emitting electrochemical cells based on small-molecules (SM-LECs). Here, a straightforward procedure is shown to control the chromaticity of pentacene-based lighting devices by means of a photoinduced cycloaddition process of the 6,13-bis(triisopropylsilylethynyl) (TIPS)-pentacene that leads to the formation of anthracene-core dimeric species featuring a high-energy emission. Without using the procedure, SM-LECs featuring deep-red emission with Commission Internationale d'Eclairage (CIE) coordinates of x = 0.69/y = 0.31 and irradiance of 0.4 μW cm−2 are achieved. After a careful optimization of the cycloaddition process, warm white devices with CIE coordinates of x = 0.36/y = 0.38 and luminances of 10 cd m−2 are realized. Here, the mechanism of the device is explained as a host–guest system, in which the dimeric species acts as the high-energy band gap host and the low-energy bandgap TIPS-pentacene is the guest. To the best of the knowledge, this work shows the first warm white SM-LECs. Since this work is based on the archetypal TIPS-pentacene and the photoinduced cycloaddition process is well-knownfor any pentacenes, this proof-of-concept could open a new way to use these compounds for developing white lighting sources.read more
Citations
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Journal ArticleDOI
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.
Journal ArticleDOI
Light-Emitting Electrochemical Cells: A Review on Recent Progress
Shi Tang,Ludvig Edman +1 more
TL;DR: Recent insights regarding the operational mechanism, breakthroughs in the development of scalable and adaptable solution-based methods for cost-efficient fabrication, and successful efforts toward the realization of LEC devices with improved efficiency and stability are presented.
Journal ArticleDOI
Highly Stable Red-Light-Emitting Electrochemical Cells
Cathrin D. Ertl,Cristina Momblona,Antonio Pertegás,José M. Junquera-Hernández,Maria-Grazia La-Placa,Alessandro Prescimone,Enrique Ortí,Catherine E. Housecroft,Edwin C. Constable,Henk J. Bolink +9 more
TL;DR: The new complexes are efficient red emitters and have been used in the active layers in light-emitting electrochemical cells (LECs) and the effects of modifications of the 2-(pyridin-2-yl)benzo[d]thiazole ligand on the photoluminescence and LEC performance have been examined.
Journal ArticleDOI
Shine bright or live long: substituent effects in [Cu(N^N)(P^P)]+-based light-emitting electrochemical cells where N^N is a 6-substituted 2,2′-bipyridine
Sarah Keller,Antonio Pertegás,Giulia Longo,Laura Martínez,Jesús Cerdá,José M. Junquera-Hernández,Alessandro Prescimone,Edwin C. Constable,Catherine E. Housecroft,Enrique Ortí,Henk J. Bolink +10 more
TL;DR: In this paper, the lifetime of the [Cu(P^P)(N^N)][PF6] ionic transition-metal (iTMC) complexes with P^P = bis(2-(diphenylphosphino)phenyl)ether (POP) or 4,5-bis(diphensylphophosphino)-9,9-dimethylxanthene (xantphos) and N^N = 6-methyl-2,2′-bipyridine (Mebpy), 6-
Journal ArticleDOI
Illuminating the electrolyte in light-emitting electrochemical cells
TL;DR: In this article, the authors present the tasks that the electrolyte should fulfil during various stages of light-emitting electrochemical cells (LECs) operation and how the characteristics of the electrolytes can affect the LEC performance, specifically the turn-on time, the efficiency and the operational stability.
References
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Electroluminescence of doped organic thin films
TL;DR: In this paper, a multilayer-doped EL was constructed using a hole-transport layer and a luminescent layer, and the electron-hole recombination and emission zones can be confined to about 50 A near the hole.
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Efficient blue organic light-emitting diodes employing thermally activated delayed fluorescence
Qisheng Zhang,Bo Li,Shuping Huang,Hiroko Nomura,Hiroyuki Tanaka,Chihaya Adachi,Chihaya Adachi +6 more
TL;DR: In this article, a blue organic light-emitting diodes that harness thermally activated delayed fluorescence was realized with an external quantum efficiency of 19.5% and reduced roll-off at high luminance.
Journal ArticleDOI
Polymer Light-Emitting Electrochemical Cells
TL;DR: Light-emitting devices based on conjugated polymers have been fabricated that operate by the proposed electrochemical oxidation-reduction mechanism and blue, green, and orange emission have been obtained with turn-on voltages close to the band gap of the emissive material.
Journal ArticleDOI
Functionalized Pentacene: Improved Electronic Properties from Control of Solid-State Order
TL;DR: The preparation of two functionalized pentacene derivatives, and the effect of this functionalization on both the solid-state ordering and the electronic properties of the resulting crystals is reported.