New deep-red heteroleptic iridium complex with 3-hexylthiophene for solution-processed organic light-emitting diodes emitting saturated red and high CRI white colors

Xuejing Liu; Shumeng Wang; Bing Yao; Baohua Zhang; Cheuk Lam Ho; Wai Yeung Wong; Yanxiang Cheng; Zhiyuan Xie

doi:10.1016/j.orgel.2015.02.016

New deep-red heteroleptic iridium complex with 3-hexylthiophene for solution-processed organic light-emitting diodes emitting saturated red and high CRI white colors

Xuejing Liu, Shumeng Wang, Bing Yao, Baohua Zhang^*, Cheuk Lam Ho, Wai Yeung Wong, Yanxiang Cheng, Zhiyuan Xie

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

46 Citations (Scopus)

Abstract

The exploitation of soluble and efficient deep-red phosphorescent emitters is of paramount importance for solution-processed organic light-emitting diodes (OLEDs) applied in both high-quality RGB displays and high color-rendering-index (CRI) solid-state lighting source. In this work, a new deep-red heteroleptic iridium(III) complex, i.e. bis[2,5-di(4-hexylthiophen-2-yl)pyridine][acetylacetonate]iridium(III) [Ir(ht-5ht-py)₂(acac)], has been synthesized and successfully used to fabricate solution-processed saturated red and white organic light-emitting diodes (WOLEDs). The long alkyl side-chains of Ir(ht-5ht-py)₂(acac) render its excellent solubility in common organic solvents and good compatibility with common host materials. The solution-processed red OLED based on Ir(ht-5ht-py)₂(acac) exhibited a decent external quantum efficiency of 8.2% and a power efficiency of 6.5 lm/W, with satisfactory Commission International de L'Eclairage (CIE) coordinates of (0.68, 0.31) for saturated red emission. Furthermore, the prepared multiple-phosphors-doped WOLED with Ir(ht-5ht-py)₂(acac) as the red emitter showed an excellent high color rendering index (CRI) value of 89 as well as low color-correlated temperature (CCT) of 2331 K, which can meet the call for physiologically-friendly indoor illumination. 2015 Published by Elsevier B.V.

Original language	English
Pages (from-to)	1-8
Number of pages	8
Journal	Organic Electronics
Volume	21
DOIs	https://doi.org/10.1016/j.orgel.2015.02.016
Publication status	Published - Jun 2015

Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Biomaterials
General Chemistry
Condensed Matter Physics
Materials Chemistry
Electrical and Electronic Engineering

User-Defined Keywords

Iridium complex
Saturated red emission
Solution-processing
White organic light-emitting diode

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10.1016/j.orgel.2015.02.016

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@article{96a4be83c7d24bceb31dc87d3cf0c748,

title = "New deep-red heteroleptic iridium complex with 3-hexylthiophene for solution-processed organic light-emitting diodes emitting saturated red and high CRI white colors",

abstract = "The exploitation of soluble and efficient deep-red phosphorescent emitters is of paramount importance for solution-processed organic light-emitting diodes (OLEDs) applied in both high-quality RGB displays and high color-rendering-index (CRI) solid-state lighting source. In this work, a new deep-red heteroleptic iridium(III) complex, i.e. bis[2,5-di(4-hexylthiophen-2-yl)pyridine][acetylacetonate]iridium(III) [Ir(ht-5ht-py)2(acac)], has been synthesized and successfully used to fabricate solution-processed saturated red and white organic light-emitting diodes (WOLEDs). The long alkyl side-chains of Ir(ht-5ht-py)2(acac) render its excellent solubility in common organic solvents and good compatibility with common host materials. The solution-processed red OLED based on Ir(ht-5ht-py)2(acac) exhibited a decent external quantum efficiency of 8.2% and a power efficiency of 6.5 lm/W, with satisfactory Commission International de L'Eclairage (CIE) coordinates of (0.68, 0.31) for saturated red emission. Furthermore, the prepared multiple-phosphors-doped WOLED with Ir(ht-5ht-py)2(acac) as the red emitter showed an excellent high color rendering index (CRI) value of 89 as well as low color-correlated temperature (CCT) of 2331 K, which can meet the call for physiologically-friendly indoor illumination. 2015 Published by Elsevier B.V.",

keywords = "Iridium complex, Saturated red emission, Solution-processing, White organic light-emitting diode",

author = "Xuejing Liu and Shumeng Wang and Bing Yao and Baohua Zhang and Ho, {Cheuk Lam} and Wong, {Wai Yeung} and Yanxiang Cheng and Zhiyuan Xie",

note = "Funding Information: Z.-Y.X and B.-H.Z acknowledge financial support from the National Basic Research Program of China (973 Project, Grant 2014CB643504 ) and the NSFC of China (Nos. 51103147 , 51473162 , 51325303 ). The financial support of the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB12030200) is also acknowledged. W.-Y.W. thanks Hong Kong Research Grants Council (HKBU203312), Areas of Excellence Scheme of HKSAR (AoE/P-03/08) and Hong Kong Baptist University (FRG2/13-14/083) for financial support. The project was also supported by Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences.",

year = "2015",

month = jun,

doi = "10.1016/j.orgel.2015.02.016",

language = "English",

volume = "21",

pages = "1--8",

journal = "Organic Electronics",

issn = "1566-1199",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - New deep-red heteroleptic iridium complex with 3-hexylthiophene for solution-processed organic light-emitting diodes emitting saturated red and high CRI white colors

AU - Liu, Xuejing

AU - Wang, Shumeng

AU - Yao, Bing

AU - Zhang, Baohua

AU - Ho, Cheuk Lam

AU - Wong, Wai Yeung

AU - Cheng, Yanxiang

AU - Xie, Zhiyuan

N1 - Funding Information: Z.-Y.X and B.-H.Z acknowledge financial support from the National Basic Research Program of China (973 Project, Grant 2014CB643504 ) and the NSFC of China (Nos. 51103147 , 51473162 , 51325303 ). The financial support of the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB12030200) is also acknowledged. W.-Y.W. thanks Hong Kong Research Grants Council (HKBU203312), Areas of Excellence Scheme of HKSAR (AoE/P-03/08) and Hong Kong Baptist University (FRG2/13-14/083) for financial support. The project was also supported by Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences.

PY - 2015/6

Y1 - 2015/6

N2 - The exploitation of soluble and efficient deep-red phosphorescent emitters is of paramount importance for solution-processed organic light-emitting diodes (OLEDs) applied in both high-quality RGB displays and high color-rendering-index (CRI) solid-state lighting source. In this work, a new deep-red heteroleptic iridium(III) complex, i.e. bis[2,5-di(4-hexylthiophen-2-yl)pyridine][acetylacetonate]iridium(III) [Ir(ht-5ht-py)2(acac)], has been synthesized and successfully used to fabricate solution-processed saturated red and white organic light-emitting diodes (WOLEDs). The long alkyl side-chains of Ir(ht-5ht-py)2(acac) render its excellent solubility in common organic solvents and good compatibility with common host materials. The solution-processed red OLED based on Ir(ht-5ht-py)2(acac) exhibited a decent external quantum efficiency of 8.2% and a power efficiency of 6.5 lm/W, with satisfactory Commission International de L'Eclairage (CIE) coordinates of (0.68, 0.31) for saturated red emission. Furthermore, the prepared multiple-phosphors-doped WOLED with Ir(ht-5ht-py)2(acac) as the red emitter showed an excellent high color rendering index (CRI) value of 89 as well as low color-correlated temperature (CCT) of 2331 K, which can meet the call for physiologically-friendly indoor illumination. 2015 Published by Elsevier B.V.

AB - The exploitation of soluble and efficient deep-red phosphorescent emitters is of paramount importance for solution-processed organic light-emitting diodes (OLEDs) applied in both high-quality RGB displays and high color-rendering-index (CRI) solid-state lighting source. In this work, a new deep-red heteroleptic iridium(III) complex, i.e. bis[2,5-di(4-hexylthiophen-2-yl)pyridine][acetylacetonate]iridium(III) [Ir(ht-5ht-py)2(acac)], has been synthesized and successfully used to fabricate solution-processed saturated red and white organic light-emitting diodes (WOLEDs). The long alkyl side-chains of Ir(ht-5ht-py)2(acac) render its excellent solubility in common organic solvents and good compatibility with common host materials. The solution-processed red OLED based on Ir(ht-5ht-py)2(acac) exhibited a decent external quantum efficiency of 8.2% and a power efficiency of 6.5 lm/W, with satisfactory Commission International de L'Eclairage (CIE) coordinates of (0.68, 0.31) for saturated red emission. Furthermore, the prepared multiple-phosphors-doped WOLED with Ir(ht-5ht-py)2(acac) as the red emitter showed an excellent high color rendering index (CRI) value of 89 as well as low color-correlated temperature (CCT) of 2331 K, which can meet the call for physiologically-friendly indoor illumination. 2015 Published by Elsevier B.V.

KW - Iridium complex

KW - Saturated red emission

KW - Solution-processing

KW - White organic light-emitting diode

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U2 - 10.1016/j.orgel.2015.02.016

DO - 10.1016/j.orgel.2015.02.016

M3 - Journal article

AN - SCOPUS:84923919015

SN - 1566-1199

VL - 21

SP - 1

EP - 8

JO - Organic Electronics

JF - Organic Electronics

ER -

New deep-red heteroleptic iridium complex with 3-hexylthiophene for solution-processed organic light-emitting diodes emitting saturated red and high CRI white colors

Abstract

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