High‐Efficiency Orange and Tandem White Organic Light‐Emitting Diodes Using Phosphorescent Dyes with Horizontally Oriented Emitting Dipoles

Lee, Sunghun; Shin, Hyun Mu; Kim, Jang‐Joo

doi:10.1002/adma.201400330

Cited by 155 publications

(96 citation statements)

References 34 publications

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“…Among all the emitting materials developed for OLEDs, phosphorescent transition metal complexes, e.g., Ir(III) and Pt(II) complexes, have drawn great attention due to their capability of harvesting 100% of the both singlet and triplet excitons electrogenerated in devices 6, 7. Using Ir(III) complexes as emitters, blue, green, and orange OLEDs with external quantum efficiencies (EQEs) over 30% have been reported 8, 9, 10, 11, 12. However, even based on elaborately designed bipolar host materials and sophisticated device structures, only several most efficient vacuum‐deposited red OLEDs using Ir(III) complexes as emitters show EQEs around 26% 11, 13, 14, 15, 16.…”

Section: Introductionmentioning

confidence: 99%

Diarylboron‐Based Asymmetric Red‐Emitting Ir(III) Complex for Solution‐Processed Phosphorescent Organic Light‐Emitting Diode with External Quantum Efficiency above 28%

et al. 2018

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Organic light‐emitting diodes (OLEDs) are one of the most promising technologies for future displays and lighting. Compared with the blue and green OLEDs that have achieved very high efficiencies by using phosphorescent Ir(III) complexes, the red OLEDs still show relatively low efficiencies because of the lack of high‐performance red‐emitting Ir(III) complexes. Here, three highly efficient asymmetric red‐emitting Ir(III) complexes with two different cyclometalating ligands made by incorporating only one electron‐deficient triarylboron group into the nitrogen heterocyclic ring are reported. These complexes show enhanced photoluminescence quantum yields up to 0.96 and improved electron transporting capacity. In addition, the asymmetric structure can help to improve the solubility of Ir(III) complexes, which is crucial for fabricating OLEDs using the solution method. The photoluminescent and oxidation–reduction properties of these Ir(III) complexes are investigated both experimentally and theoretically. Most importantly, a solution‐processed red OLED achieves extremely high external quantum efficiency, current efficiency, and power efficiency with values of 28.5%, 54.4 cd A−1, and 50.1 lm W−1, respectively, with very low efficiency roll‐off. Additionally, the related device has a significantly extended operating lifetime compared with the reference device. These results demonstrate that the asymmetric diarylboron‐based Ir(III) complexes have great potential for fabricating high‐performance red OLEDs.

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Section: Introductionmentioning

confidence: 99%

Diarylboron‐Based Asymmetric Red‐Emitting Ir(III) Complex for Solution‐Processed Phosphorescent Organic Light‐Emitting Diode with External Quantum Efficiency above 28%

et al. 2018

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“…Due to these advantages, it is reasonable to expect better performance from the TOLEDs utilizing OHJs interconnectors. Actually, most of the high efficiency TOLEDs published so far are based on OHJs interconnectors [13], [18], [49], [50], [55], [56].…”

Section: Ohj Typementioning

confidence: 99%

Interconnectors in Tandem Organic Light Emitting Diodes and Their Influence on Device Performance

Sun

Chen²,

Chen

et al. 2016

IEEE J. Select. Topics Quantum Electron.

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In this paper, we present a comprehensive review on recent progress of interconnectors in tandem organic light emitting diodes, from structure design to performance and their working principles. We will introduce the most commonly used interconnectors, discuss in detail the main features of them, as well as the advantages and disadvantages of each type. Especially, organic heterojunction type interconnectors are highlighted.

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“…Relevant literature (AlSalhi et al 2011;Chen and Hwang 2007;Kamtekar et al 2010;Lambeth 2004;Lee et al 2014;Lin 2009;Liu et al 2006;Madhava Rao et al 2013;Park et al 2009;Sebastian et al 2009;Segal et al 2007;So et al 2007;Sun et al 2014;Zink et al 2014) was referred to, and four experts were consulted, to verify the above research fronts. Among the research fronts mentioned above, six derived from bibliographic coupling are identified as important.…”

Section: Comparisonsmentioning

confidence: 99%

A comparative study on detecting research fronts in the organic light-emitting diode (OLED) field using bibliographic coupling and co-citation

Huang

Chang²

2014

Scientometrics

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Research fronts represent areas of cutting-edge study in specific fields. They not only provide insights into current focuses and future trends, but also serve as important indicators for government policymaking with regard to technology. This study employed both bibliographic coupling and co-citation as methods to analyze the evolution of research fronts in the OLED field, and compared the outcomes in order to identify the differences between, and assess the effectiveness of, the two methods in detecting such research fronts. This study indicated that both analytic methods can be employed to track the evolution of research fronts. Compared with co-citation, bibliographic coupling identifies a higher number of research fronts, and detects the emergence of the research fronts earlier, thus showing better performance than co-citation in detecting research fronts.

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High‐Efficiency Orange and Tandem White Organic Light‐Emitting Diodes Using Phosphorescent Dyes with Horizontally Oriented Emitting Dipoles

Cited by 155 publications

References 34 publications

Diarylboron‐Based Asymmetric Red‐Emitting Ir(III) Complex for Solution‐Processed Phosphorescent Organic Light‐Emitting Diode with External Quantum Efficiency above 28%

Diarylboron‐Based Asymmetric Red‐Emitting Ir(III) Complex for Solution‐Processed Phosphorescent Organic Light‐Emitting Diode with External Quantum Efficiency above 28%

Interconnectors in Tandem Organic Light Emitting Diodes and Their Influence on Device Performance

A comparative study on detecting research fronts in the organic light-emitting diode (OLED) field using bibliographic coupling and co-citation

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