A bipolar host containing 1,2,3-triazole for realizing highly efficient phosphorescent organic light-emitting diodes

Kim, Myoung Ki; Kwon, Jongchul; Kwon, Tae‐Hyuk; Hong, Jong‐In

doi:10.1039/c0nj00091d

Cited by 60 publications

(37 citation statements)

References 21 publications

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“…[205][206][207][208] With different linking modes, carbazole/ triazole hybrids can realize high E T in the range of 2.8 to 3.0 eV, and CzTAZ (Fig. [205][206][207][208] With different linking modes, carbazole/ triazole hybrids can realize high E T in the range of 2.8 to 3.0 eV, and CzTAZ (Fig.…”

Section: View Article Onlinementioning

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: View Article Onlinementioning

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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“…Various electron‐transport units have been combined with the hole‐transport units to develop the bipolar host materials, including diphenylphosphine oxide, oxadiazole, triazole, imidazole, pyridine, and triazine [13a] . Diphenylphosphine oxide is one of the most widely used electron‐transport units for bipolar host materials due to its good electron‐transport character and tetrahedral geometric structure, which isolates aromatic units electronically.…”

Section: Bipolar Host Materials For Oledsmentioning

confidence: 99%

Bipolar Host Materials for Organic Light-Emitting Diodes

Yook

Lee

2015

The Chemical Record

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It is important to balance holes and electrons in the emitting layer of organic light-emitting diodes to maximize recombination efficiency and the accompanying external quantum efficiency. Therefore, the host materials of the emitting layer should transport both holes and electrons for the charge balance. From this perspective, bipolar hosts have been popular as the host materials of thermally activated delayed fluorescent devices and phosphorescent organic light-emitting diodes. In this review, we have summarized recent developments of bipolar hosts and suggested perspectives of host materials for organic light-emitting diodes.

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“…1,2,3‐Triazole‐containing conjugated molecules also demonstrate appreciable applications as ET materials in OLEDs 47. Using click chemistry, the HT‐type host CBP was decorated with an electron‐accepting 1,2,3‐triazole moiety by a saturated bridge, giving the bipolar host material 9,9″‐(2‐((4‐phenyl‐1,2,3‐triazol‐1‐yl)methyl)biphenyl‐4,4′‐diyl)biscarbazole (CBP‐TA, 18 ) 48. The external quantum efficiency (5.4%) of a CBP‐TA hosted blue (FIrpic) PhOLED device is 30% higher than that of the CBP‐based device (4.2%).…”

Section: Molecular Design Of Bipolar Host Materialsmentioning

confidence: 99%

Bipolar Host Materials: A Chemical Approach for Highly Efficient Electrophosphorescent Devices

2011

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The future of organic light-emitting devices (OLEDs) is drifting from electrofluorescence toward electrophosphorescence due to the feasibility of realizing 100% internal quantum efficiency. There is limited availability of transition metals (TMs) such as Ir, Os, and Pt, which are used for color-tunable phosphorescent emitters, and the use of the host-guest strategy is necessary for suppressing the detrimental triplet-triplet annihilation inherently imparted by the TM-centered emitters. The inevitable demands of organic host materials provide organic chemists with tremendous opportunities to contribute their expertise to this technology. With suitable molecular design and judicious selection of chemical structures featured with different electronic nature, the incorporation of hole-transporting (HT) and electron-transporting (ET) moieties combines the advantages of both functional units into bipolar host materials, which perform balanced injection/transportation/recombination of charge carriers and consequentially lead the OLEDs to have higher performances and low roll-off efficiencies. This review highlights recently developed bipolar host materials with the focus on molecular design strategies and the structure-property-performance relationships of various classes of bipolar host materials, which are classified into several categories according to the structural features of their constituents (HT/ET blocks and spacers).

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A bipolar host containing 1,2,3-triazole for realizing highly efficient phosphorescent organic light-emitting diodes

Cited by 60 publications

References 21 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

Bipolar Host Materials for Organic Light-Emitting Diodes

Bipolar Host Materials: A Chemical Approach for Highly Efficient Electrophosphorescent Devices

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