Benzene substituted with bipyridine and terpyridine as electron-transporting materials for organic light-emitting devices

Ichikawa, Musubu; Yamamoto, Takayuki; Jeon, Hyeon‐Gu; Kase, Kouki; Hayashi, Shûichi; Nagaoka, Makoto; Yokoyama, Norimasa

doi:10.1039/c2jm16274a

Cited by 19 publications

(11 citation statements)

References 41 publications

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“…105,[172][173][174] Connecting these electron-withdrawing groups with electron-donating units will result in bipolar materials with good HT and ET properties. Nitrogen-containing six-membered heterocyclic groups such as pyridine, pyrimidine and triazine are electron-deficient structures and have been used to develop ET materials for OLEDs.…”

Section: Bipolar Host Materialsmentioning

confidence: 99%

Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices

2015

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Phosphorescent organic light-emitting devices (OLEDs) have attracted increased attention from both academic and industrial communities due to their potential practical application in high-resolution full-color displays and energy-saving solid-state lightings. The performance of phosphorescent OLEDs is mainly limited by the phosphorescent transition metal complexes (such as iridium(III), platinum(II), gold(III), ruthenium(II), copper(I) and osmium(II) complexes, etc.) which can play a crucial role in furnishing efficient energy transfer, balanced charge injection/transporting character and high quantum efficiency in the devices. It has been shown that functionalized main-group element (such as boron, silicon, nitrogen, phosphorus, oxygen, sulfur and fluorine, etc.) moieties can be incorporated into phosphorescent emitters and their host materials to tune their triplet energies, frontier molecular orbital energies, charge injection/transporting behavior, photophysical properties and thermal stability and hence bring about highly efficient phosphorescent OLEDs. So, in this review, the recent advances in the phosphorescent emitters and their host materials functionalized with various main-group moieties will be introduced from the point of view of their structure-property relationship. The main emphasis lies on the important role played by the main-group element groups in addressing the key issues of both phosphorescent emitters and their host materials to fulfill high-performance phosphorescent OLEDs.

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Section: Bipolar Host Materialsmentioning

confidence: 99%

Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices

2015

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“…Generally, electron-deficient aromatic moieties such as oxadiazoles, triazoles, imidazoles, pyridines, and pyrimidines are used as building blocks for an ETL to accept electrons from the cathode efficiently. [40] Benzophosphole sulfide derivative DBPSB, developed by Tsuji, has a high μ e of 2 ϫ 10 -3 cm 2 V -1 s -1 measured by the TOF method. [11,12,[34][35][36][37] A number of recent typical examples of ETMs are shown in Figure 1.…”

Section: Multifunctional Etlsmentioning

confidence: 99%

Recent Progress in Phosphorescent Organic Light‐Emitting Devices

Sasabe¹,

Kido²

2013

Eur J Org Chem

259

157

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Organic light‐emitting devices (OLEDs) are solid‐state light‐emitting devices based on organic semiconductors. Recent rapid advances in materials chemistry have enabled white OLEDs to be used for general lighting and large‐area flat panel display. White OLED panel efficacy has reached 90 lm W–1, and a tandem white OLED panel has achieved a lifetime of over 100000 h at 1000 cd m–2. LG is set to launch a 55″ OLED TV in 2013, and OLEDs will be expected to make bigger breakthroughs. Although white OLED panels show superior performance, there is still much room (nearly 160 lm W–1) for improvement, in view of the theoretical limit of 248 lm W–1. To reach this objective, OLEDs need to achieve three goals: (1) high internal quantum efficiency, (2) low operation voltage, and (3) high light‐outcoupling efficiency at the same time. For organic chemists creating new organic semiconductors, issues (1) and (2) are particularly important because these relate to materials chemistry. Here we review recent developments in phosphorescent OLED technology, especially from materials chemistry.

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“…Figure shows the chemical structures of host materials, and their synthetic routes are illustrated in Scheme . The precursor of the boronic ester was synthesized according to a reported procedure . The synthesis of the host materials was followed by sequential Suzuki coupling, reduction and nucleophilic substitution reactions.…”

Section: Resultsmentioning

confidence: 99%

Thermally Cross‐Linkable Host Materials for Solution‐Processed OLEDs: Synthesis, Characterization, and Optoelectronic Properties

et al. 2016

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A series of cross‐linkable bipolar host materials containing carbazole (donor, D) and 1,2,4‐triazole (acceptor, A) were designed and synthesized. The host materials with styryl groups can be thermally cross‐linked by curing at 172–190 °C without any polymerization initiator. Excellent solvent resistance was observed for all the host materials, which is beneficial for the preparation of subsequent functional layers by solution processes. The highest occupied molecular orbital energy levels of 5.55, 5.58 and 5.54 eV are estimated for these host materials, which indicates low injection barrier from the hole transport layer. A current efficiency of 15.3 cd A–1 and an external quantum efficiency of 4.6 % were achieved for solution‐processed Ir(mppy)3‐based OLEDs by using the cross‐linkable host material.

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Benzene substituted with bipyridine and terpyridine as electron-transporting materials for organic light-emitting devices

Cited by 19 publications

References 41 publications

Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices

Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices

Recent Progress in Phosphorescent Organic Light‐Emitting Devices

Thermally Cross‐Linkable Host Materials for Solution‐Processed OLEDs: Synthesis, Characterization, and Optoelectronic Properties

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