“…120,[145][146][147]461 Moore and co-workers 120 first reported the design and synthesis of a dendritic LED ( Figure 25) in 1996. The incorporation of triarylamine groups on the periphery 231 improved the hole injection process, lowering the onset voltage required to operate the devices.…”
Section: Scheme 32mentioning
confidence: 99%
“…The incorporation of triarylamine groups on the periphery 231 improved the hole injection process, lowering the onset voltage required to operate the devices. In separate work, Freeman et al showed that if the dendrimers are designed to provide sufficient site isolation of their core, intermolecular energy transfer is inhibited enabling simultaneous emission from different core chromophores. , As a result, the color of emission from the device may be tuned by simply adjusting the ratio between different “site-isolated” dendritic chromophores. 24 25 26 …”
Section: Applications Of Peripheral Modificationmentioning
confidence: 99%
“…The first examples of convergent end group modification were carried out by initiating the poly(benzyl ether) synthesis with para-substituted benzyl bromide end groups. , A wide range of functional end groups proved compatible with the halogenation and Williamson coupling conditions required during iterative dendritic growth, including cyano, ,,, bromo, ,, alkyl ester, ,,, alkyl ether, ,,, perfluoro alkyl ether, ,− and oligo(ethylene glycol) ether. , These simple variations enabled the solubility of the resulting dendrimers to be readily tuned. Fréchet-type dendrons have also been synthesized with end groups containing vinyl groups, , organoruthenium moieties, − ferrocenyl groups, TADDOL catalytic sites, concave pyridine units, , liquid crystalline end groups, and chromophores. ,− ,,, Similar approaches have been employed to incorporate triarylamine, oligo(ethylene glycol), , tetrathiafulvalene (TTF), − saccharide, − fullerene, ,, and ferrocene , moieties onto the periphery of other dendritic backbones.…”
Section: A Introduction Of End Groups Prior To Dendritic
Growthmentioning
“…120,[145][146][147]461 Moore and co-workers 120 first reported the design and synthesis of a dendritic LED ( Figure 25) in 1996. The incorporation of triarylamine groups on the periphery 231 improved the hole injection process, lowering the onset voltage required to operate the devices.…”
Section: Scheme 32mentioning
confidence: 99%
“…The incorporation of triarylamine groups on the periphery 231 improved the hole injection process, lowering the onset voltage required to operate the devices. In separate work, Freeman et al showed that if the dendrimers are designed to provide sufficient site isolation of their core, intermolecular energy transfer is inhibited enabling simultaneous emission from different core chromophores. , As a result, the color of emission from the device may be tuned by simply adjusting the ratio between different “site-isolated” dendritic chromophores. 24 25 26 …”
Section: Applications Of Peripheral Modificationmentioning
confidence: 99%
“…The first examples of convergent end group modification were carried out by initiating the poly(benzyl ether) synthesis with para-substituted benzyl bromide end groups. , A wide range of functional end groups proved compatible with the halogenation and Williamson coupling conditions required during iterative dendritic growth, including cyano, ,,, bromo, ,, alkyl ester, ,,, alkyl ether, ,,, perfluoro alkyl ether, ,− and oligo(ethylene glycol) ether. , These simple variations enabled the solubility of the resulting dendrimers to be readily tuned. Fréchet-type dendrons have also been synthesized with end groups containing vinyl groups, , organoruthenium moieties, − ferrocenyl groups, TADDOL catalytic sites, concave pyridine units, , liquid crystalline end groups, and chromophores. ,− ,,, Similar approaches have been employed to incorporate triarylamine, oligo(ethylene glycol), , tetrathiafulvalene (TTF), − saccharide, − fullerene, ,, and ferrocene , moieties onto the periphery of other dendritic backbones.…”
Section: A Introduction Of End Groups Prior To Dendritic
Growthmentioning
“…Coumarin 343 (C343) and pentathiophene (T5), capable of electronic interaction via Fo¨rster energy transfer. Freeman et al 61 successfully utilized triarylamine (TAA) holetransporting labeled poly(benzyl ether) dendrimers possessing C343 and T5 core dyes to give blue and green OLEDs, respectively. Initial attempts to achieve synergistic emission from the two types of dendrimers by blending them into a single layer were moderately successful due to detrimental energy transfer from C343 to T5 possessing the smaller band-gap.…”
Section: General Structure and Device Performance A Dendrons And Dend...mentioning
confidence: 99%
“…Using the dendrimer containing 12 triarylamine (TAA), as hole transport, the dyes, C343 and T5 were coated. 61 The single-layer devices, ITO/dendrimer-PBD/ Mg:Ag/Ag, were fabricated. Most of the devices had turn-on voltages between 12-15 V and could be driven at voltages exceeding 30 V.…”
Section: General Structure and Device Performance A Dendrons And Dend...mentioning
The general concepts, design criteria, and physical parameters, such as component placement and electroluminescence, that relate to the construction of OLED devices are described, followed by a discussion of the current literature detailing the use of branched and dendritic materials as the key electroluminescent elements of single- and multi-layered fabricated devices. Their configurations, efficiencies, emission intensities, and molecular structural implications are also delineated and discussed. This critical review should appeal to researchers in the synthetic, material, and physical sciences (122 references).
The advantage of using phosphorescent transition metal–ligand complexes in optoelectronic applications such as organic light‐emitting diodes (OLEDs) and light‐emitting electrochemical cells (LECs) are described and evaluated. Additionally, different device constructions utilizing phosphorescent transition‐metal complexes like iridium(III) mixed‐ligand complexes and ruthenium(II) systems are reviewed and specified. Diverse host materials in which the phosphorescent emitters can be placed are discussed, such as small organic molecules and a few polymeric systems, and alternative processing technologies are briefly compared. Recent developments in the synthesis of iridium(III) triplet emitters are discussed. Different device architectures require different kinds of metal–ligand complexes. The different synthetic routes leading to charged and non‐charged complexes are briefly discussed.
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