Modified <i>N,N′</i>‐Dicarbazolyl‐3,5‐benzene as a High Triplet Energy Host Material for Deep‐Blue Phosphorescent Organic Light‐Emitting Diodes

Cho, Yongjoo; Lee, Jun Yeob

doi:10.1002/chem.201101095

Cited by 59 publications

(16 citation statements)

References 49 publications

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“…Diphenylphosphine oxide modification of central phenyl unit of mCP yielded (3,5‐di(9H‐carbazole‐9‐yl)phenyl)diphenylphosphine oxide (DCPPO). The triplet energy of DCPPO was 2.99 eV and the glass transition temperature was 107 °C 63. DCPPO showed bipolar charge transport properties due to the hole transport carbazole and electron tranasport diphenylphosphine oxide units.…”

Section: Organic Materials For Deep Blue Pholedsmentioning

confidence: 98%

Organic Materials for Deep Blue Phosphorescent Organic Light‐Emitting Diodes

2012

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Recently, great progress has been made in the device performance of deep blue phosphorescent organic light-emitting diodes (PHOLEDs) by developing high triplet energy charge-transport materials, high triplet energy host and deep blue emitting phosphorescent dopant materials. A high quantum efficiency of over 25% and a high power effi ciency of over 15 lm/W have already been achieved at 1000 cd m − 2 in the deep blue PHOLEDs with a y color coordinate less than 0.20. In this work, recent developments in organic materials for high effi ciency deep blue PHOLEDs are reviewed and a future strategy for the development of high effi ciency deep blue PHOLEDs is proposed. Adv. Mater. 2012, 24, 3169-3190 3170 www.advmat.de www.MaterialsViews.com wileyonlinelibrary.com REVIEWHOMO, LUMO, triplet energy and glass transition temperature (Tg) were summarized for host materials in addition to device performances of blue PHOLEDs. Hole or electron mobility data were added for charge transport materials, while photoluminescence (PL) and PL quantum effi ciency values were also considered for dopant materials. Deep blue PHOLED device data were preferentially described in this work. However, many papers used sky blue dopant materials in device fabrication to evaluate host and charge transport materials due to limited availability of deep blue emitting material. Therefore, sky blue device data were inserted in the case of organic materials without any deep blue test result.

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Section: Organic Materials For Deep Blue Pholedsmentioning

confidence: 98%

Organic Materials for Deep Blue Phosphorescent Organic Light‐Emitting Diodes

2012

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“…Furthermore, all the three hosts show high T g (128 1C for 3CN33BCz, 132 1C for both 3CN34BCz and 3CN44BCz) and E T (2.95 eV for 3CN33BCz, 2.98 eV for 3CN34BCz, 3.00 eV for 3CN44BCz) ( Table 7). [240][241][242] The substitution position and number of the diphenylphosphoryl unit will show a trivial influence on E T of the concerned bipolar hosts. Both blue (FIrpic) and green (Ir(ppy) 3 ) PHOLEDs based on these bipolar hosts exhibit dramatically high efficiencies with EQEs exceeding 25.0%.…”

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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“…Although the two host materials have the same functional groups and molecular weight, the CPBDC host was much better than the BCPCB host in lowering the driving voltage because of its strong hole‐ and electron‐transport character. In addition, (3,5‐di(9 H ‐carbazol‐9‐yl)phenyl)diphenylphosphine oxide (DCPPO), with the diphenylphosphine oxide moiety at the central phenyl unit of mCP, could also increase the QE of blue PHOLEDs by balanced charge density . In the deep‐blue PHOLEDs, a high QE of 22.4% and a color coordinate of (0.14, 0.17) were demonstrated using the DCPPO host material.…”

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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Modified N,N′‐Dicarbazolyl‐3,5‐benzene as a High Triplet Energy Host Material for Deep‐Blue Phosphorescent Organic Light‐Emitting Diodes

Cited by 59 publications

References 49 publications

Organic Materials for Deep Blue Phosphorescent Organic Light‐Emitting Diodes

Organic Materials for Deep Blue Phosphorescent Organic Light‐Emitting Diodes

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

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