Design and synthesis of polymers for light-emitting diodes

Abstract

Polymers with aromatic ϕ‐conjugated moieties were utilized as electroluminescent materials. In order to meet the requirements for light‐emitting diodes (LED), the design and synthesis of electroluminescent polymers had to be developed and viewed in this review. Focus is on polymers with arylene vinylene, arylene ethinylene, phenylene, thiophene and arylene amine moieties as light‐emitting, hole‐transporting and electron‐transporting materials in LED devices. An attempt has been made to arrange a structural classification of electroluminescent polymers in nonsegmented and segmented polymers. © 1998 John Wiley & Sons, Ltd.

Theoretical Description of the Geometry, Electronic Structure and Reactivity Analysis for a Set of Tris‐Chelates with Application in Organic Light Emitting Diodes

“…The result obtained here is consistent with previous experimental studies, which have demonstrated that when a low work function metal acts as a cathode, this injects electrons to the LUMO of the electron transport layer. [31][32][33][34] On the other hand, the local softness is usually used as a tool for predicting the intermolecular reactivity sequences of a set of molecules, comparing different regions in different molecules. In our case, this descriptor may be used in order to compare the most reactive regions in the studied set.…”

Photophysical and Electro-Optical Properties of Copolymers Bearing Blue and Red Chromophores for Single-Layer White OLEDs

“…This means that the Cz unit in the electronic excited state can transfer part of its energy directly to BTZ in the electronic ground state, as it is demonstrated by the close matching of BTZ absorption spectrum over the Cz emission spectrum, at the region between 400 and 500 nm [11,12,[31][32][33]. The energy transfer mechanism between donor and acceptor components is a promising approach to obtain stable color mixing in a single layer to achieve white light emission [12,31,32]. The PL emission spectra of CzHom, CzCop, BTZ and WCop thin films, recorded upon excitation at 370 nm, are illustrated in Figure 6.…”

“…This means that the Cz unit in the electronic excited state can transfer part of its energy directly to BTZ in the electronic ground state, as it is demonstrated by the close matching of BTZ absorption spectrum over the Cz emission spectrum, at the region between 400 and 500 nm [11,12,[31][32][33]. The energy transfer mechanism between donor and acceptor components is a promising approach to obtain stable color mixing in a single layer to achieve white light emission [12,31,32].…”

Liquid Crystals Templating

“…In Hulvat's approach, the polymerisation was carried out in the hydrophobic domain of the hexagonal lyotropic liquid crystal phase. This allowed the use of less polar but more useful monomers, such as 3,4-ethyldioxythiophene (EDOT) and bithiophene [51,52]. The polymers formed within the template provided an ease of processing since the nanoscale distribution of monomers in the LCs was locked-in during polymerisation.…”