Recent advances of the emitters for high performance deep-blue organic light-emitting diodes

Yang, Xiaolong; Xu, Xianbin; Zhou, Guijiang

doi:10.1039/c4tc02474e

Cited by 527 publications

(349 citation statements)

References 251 publications

(234 reference statements)

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“…For example, a recent report detailed the performance of a new champion blue OLED, which showed simultaneously deep-blue emission and high device efficiency (EQE = 10.1 %) [43]. However, this efficiency value still falls well below the efficiencies reported for red or green (EQE * 30 %), or even sky-blue OLEDs (EQE [20 %) [4]. Table 3 Summary of LEECs employing blue-emitting iTMCs In the case of LEECs, the situation is more dire.…”

Section: Bluementioning

confidence: 89%

“…The dimer can then be easily cleaved in the presence of a neutral N^N ligand under mild conditions (such as refluxing DCM/methanol) [11], with the complex isolated as its chloride salt. While the chloride salts of these complexes do function LEECs, chloride anions have been implicated to negatively impact device stability (vide infra) [12] and thus typically the chloride anion is exchanged through a metathesis reaction for a tetrafluoroborate (BF 4 -) or most commonly a hexafluorophosphate (PF 6 -) anion instead.…”

Section: Synthesesmentioning

confidence: 99%

“…Since the first report of a phosphorescent emitter in an organic light-emitting diode (OLED) [1], iridium complexes have come to be the most widely used class of emitters employed for this purpose by virtue of their efficient spin-orbit coupling (SOC) processes that relax the spin selection rule that otherwise forbids T 1 to S 0 transitions [2][3][4]. In an electroluminescent device, spin statistics necessitates that 75 % of excitons generated in the device are in the triplet state, while the remainder are in the singlet state.…”

Section: Introductionmentioning

confidence: 99%

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Luminescent Iridium Complexes Used in Light-Emitting Electrochemical Cells (LEECs)

Henwood

Zysman‐Colman

2016

Topics in Current Chemistry Collections

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Section: Bluementioning

confidence: 89%

Section: Synthesesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Luminescent Iridium Complexes Used in Light-Emitting Electrochemical Cells (LEECs)

Henwood

Zysman‐Colman

2016

Topics in Current Chemistry Collections

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“…[1][2][3][4][5][6][7][8][9] The chelating ligands are known to control both intermolecular interactions through steric constraints and electrical characteristics. Hence, both variation of the metal-ligand bond strength though choice of donor atoms of the chelates and addition of dendritic functional -3 -appendages, have proved highly valuable as part of the complex design strategy.…”

Section: Introductionmentioning

confidence: 99%

Ir(III)-Based Phosphors with Bipyrazolate Ancillaries; Rational Design, Photophysics, and Applications in Organic Light-Emitting Diodes

et al. 2015

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Publisher's copyright statement:This document is the Accepted Manuscript version of a Published Work that appeared in nal form in Inorganic Chemistry, copyright c American Chemical Society after peer review and technical editing by the publisher. To access the nal edited and published work see http://dx.doi.org/10.1021/acs.inorgchem.5b01835. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. emitting layer design was adopted in the device architecture using Ir(III) metal complexes 3 and 4, attaining peak external quantum efficiencies, luminance efficiencies, and power efficiencies of 18.1% (58.6 cd/A and 38.6 lm/W) and 16.4% (51.6 cd/A and 28.9 lm/W), respectively.--

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Ultrathin silica film derived with ultraviolet irradiation of perhydropolysilazane for high performance and low voltage organic transistor and inverter

et al. 2018

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In recent years, organic electronic devices have become more and more popular, such as organic solar cell (OSC) [1][2][3][4], organic light emitting diode (OLED) [5][6][7] and organic thin film transistor (OTFT) [8][9][10][11] by virtue of their light weight, easy-processing and flexibility. As OTFT could be used as functional device or drive circuit to activate other devices [12,13], the development of OTFT becomes more urgent in practical applications. Low voltage operation as one of the major performances is very important to apply OTFT in low power consumption situations, especially in wearable and portable devices. As we all know, dielectric layer plays an important role to modulate the operation voltage of OTFT. Utilization of ultrathin dielectric film is an effective method to construct low voltage transistor. Therefore, new dielectric materials and novel processing methods for ultrathin dielectric films are two main ways to adjust the energy consumption performance of OTFT. Generally, most dielectric materials are composed of polymers or inorganic oxides [14,15]. For polymers, although the cheap and easy-process features make them popular in organic electronics [16,17], ultrathin polymer film has a risk of leakage. Inorganic oxides, such as silica and alumina, generally have excellent stability and low leakage even with ultrathin thickness, but they are usually prepared by physical vapor deposition (PVD) [18], chemical vapor deposition (CVD) [19], sol-gel [20] and atom layer deposition (ALD) [21], etc., which usually need high temperature, expensive equipment, and complex procedures. Therefore, from the standpoint of performance, preparation of ultrathin inorganic oxides layer through low cost and mild condition is highly meaningful for the construction of low voltage OTFT.Silica is one of the most extensively used inorganic dielectric oxides because of its high performance and mature processing [22][23][24][25]. However, the traditional processes are not compatible with modern organic electronics and large-scale production that generally requires low-cost and low temperature process. Recently, silica derived from solution precursor conversion method has drawn more and more attention. The most common solution precursor is perhydropolysilazane (PHPS) which possesses basic chemical structure of [-Si(H 2 )-NH-] and usually goes through the hydrolysis, condensation and oxidation reaction of active Si-N bond and Si-H bond to form silica [26][27][28][29][30][31][32]. In our previous work, the conversion is finished by thermal annealing of PHPS on a hot plate [33]. Despite lower power consumption method, it may be not completely compatible with organic electronics due to the thermal annealing procedure. Some polymer substrates with low glass transition temperature cannot endure the annealing temperature [34][35][36]. Therefore, we further exploit milder silica preparation method based on PHPS. In this letter, we introduce an ultraviolet irradiation conversion to fabricate ultrathin silica film and further appl...

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Recent advances of the emitters for high performance deep-blue organic light-emitting diodes

Abstract: Recent advances in deep-blue emitters furnishing high performance OLEDs and associated critical issues are discussed and reviewed.

Cited by 527 publications

References 251 publications

Luminescent Iridium Complexes Used in Light-Emitting Electrochemical Cells (LEECs)

Luminescent Iridium Complexes Used in Light-Emitting Electrochemical Cells (LEECs)

Ir(III)-Based Phosphors with Bipyrazolate Ancillaries; Rational Design, Photophysics, and Applications in Organic Light-Emitting Diodes

Ultrathin silica film derived with ultraviolet irradiation of perhydropolysilazane for high performance and low voltage organic transistor and inverter

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