Novel iridium(<scp>iii</scp>) complexes bearing dimesitylboron groups with nearly 100% phosphorescent quantum yields for highly efficient organic light-emitting diodes

Liu, Boao; Dang, Feifan; Zhao, Feng; Tian, Zhongmin; Zhao, Jiang; Wu, Yong; Yang, Xiaolong; Zhou, Guijiang; Wu, Zhaoxin; Wong, Wai Yeung

doi:10.1039/c7tc02369c

Cited by 49 publications

(24 citation statements)

References 79 publications

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“…The EQE of the PMD‐Ir‐3‐based device is among the highest values for the iridium‐based red PhOLEDs (see Figure ). [4a–d,6,7,24] Additionally, the EQEs remained as high as 24.6% and 17.9% at high luminance values of 1000 and 10 000 cd m −2 , respectively. The low EQE roll‐off was comparable to the reported red PhOLEDs.…”

Section: Resultsmentioning

confidence: 96%

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Using Simple Fused‐Ring Thieno[2,3‐d]pyrimidine to Construct Orange/Red Ir(III) Complexes: High‐Performance Red Organic Light‐Emitting Diodes with EQEs up to Nearly 28%

Jiang

Zhao

Ning

et al. 2018

Advanced Optical Materials

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In this article, a promising molecular design strategy for obtaining highly efficient orange/red iridium complexes by utilizing simple fused‐ring thieno[2,3‐d]pyrimidine derivatives as the cyclometalated ligands is reported. The introduction of a pyrimidine moiety lowers the lowest unoccupied molecular orbital (LUMO) energy levels and consequently narrows the HOMO–LUMO (HOMO = highest occupied molecular orbital) energy gaps to obtain orange/red emissions. As a result, a series of phosphorescent iridium complexes, namely, PMD‐Ir‐1, PMD‐Ir‐2, PMD‐Ir‐3, and PMD‐Ir‐4, with emission peaks in the range of 578–614 nm are obtained. Notably, phosphorescent organic light‐emitting diodes (PhOLEDs) utilizing PMD‐Ir‐2 and PMD‐Ir‐3 as emitters exhibit orange and red emissions with maximum external quantum efficiencies up to 24.5% and 27.6%, respectively. These results clearly demonstrate that the thieno[2,3‐d]pyrimidine‐based iridium complexes have great potential for fabricating high‐performance orange/red OLEDs.

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Section: Resultsmentioning

confidence: 96%

“…The low EQE roll‐off was comparable to the reported red PhOLEDs. [24f,25] For example, Han et al reported a series of (MDQ) 2 Ir(acac)‐based devices with EQE roll‐off values above 27% at a normal operation luminance of 1000 cd m −2 …”

Section: Resultsmentioning

confidence: 99%

Using Simple Fused‐Ring Thieno[2,3‐d]pyrimidine to Construct Orange/Red Ir(III) Complexes: High‐Performance Red Organic Light‐Emitting Diodes with EQEs up to Nearly 28%

Jiang

Zhao

Ning

et al. 2018

Advanced Optical Materials

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“…The phosphorescent emitters incorporating heavy metals can reach an IQE of nearly 100% by enhancing electron spin-orbit coupling (Baldo et al, 1998;Adachi et al, 2001;Xia et al, 2014). However, the applications of phosphorescent materials containing heavy metals are limited owing to their high cost and environmental contamination (Li et al, 2013;Liu et al, 2017a;Wang et al, 2018). Accordingly, it is critically important to develop novel metal-free materials, which can be functionalized as efficient emitters and exhibit environment friendliness.…”

Section: Introductionmentioning

confidence: 99%

Rational Design of π-Conjugated Tricoordinated Organoboron Derivatives With Thermally Activated Delayed Fluorescent Properties for Application in Organic Light-Emitting Diodes

Jin

Xin

2020

Front. Chem.

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A series of donor-acceptor (D-A) tricoordinated organoboron derivatives (1-10) have been systematically investigated for thermally activated delayed fluorescent (TADF)-based organic light-emitting diode (OLED) materials. The calculated results show that the designed molecules exhibit small singlet-triplet energy gap (E ST) values. Density functional theory (DFT) analysis indicated that the designed molecules display an efficient separation between donor and acceptor fragments because of a small overlap between donor and acceptor fragments on HOMOs and LUMOs. Furthermore, the delayed fluorescence emission color can be tuned effectively by introduction of different polycyclic aromatic fragments in parent molecule 1. The calculated results show that molecules 2, 3, and 4 possess more significant Stokes shifts and red emission with small E ST values. Nevertheless, other molecules exhibit green (1, 7, and 8), light green (6 and 10), and blue (5 and 9) emissions. Meanwhile, they are potential ambipolar charge transport materials except that 4 and 10 can serve as electron and hole transport materials only, respectively. Therefore, we proposed a rational way for the design of efficient TADF materials as well as charge transport materials for OLEDs simultaneously.

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“…As we known, phosphors are generally heavy metal complexes. The spin–orbit coupling (SOC) of heavy metal (Ir, Pt, et al) ion cores will significantly enhance the energy transfer processes between singlet and triplet states [intersystem crossing process (ISC) from S 1 to T 1 and phosphorescent decay from T 1 to S 0 ], allowing heavy metal complexes to achieve phosphorescence efficiently (Baldo et al, 1998; Liu X. et al, 2015; Liu B. et al, 2017). Correspondingly, in new type exciplexes, the decay routes of excited exciplexes will be also affected by the heavy metal phosphor cores.…”

Section: Introductionmentioning

confidence: 99%

Development of Red Exciplex for Efficient OLEDs by Employing a Phosphor as a Component

et al. 2019

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Exciplexes are ideal candidates as effective thermally activated delayed fluorescence (TADF) emitters. However, efficient orange and red TADF exciplexes have been reported seldomly, because their significant non-radiative (NR) decay of excited states lead to unavoidable energy loss. Herein, we propose a novel strategy to construct efficient red TADF exciplexes by introducing phosphor as one component. Due to the strong spin–orbit coupling of heavy metal (e.g., Ir, Pt, et al.) ion cores, the NR decays will be evidently decreased for both singlet and triplet excitons, reducing the undesired exciton waste. Moreover, compared with the conventional exciplexes, phosphorescence plays an important role for such novel exciplexes, further improving the exciton utilization. Based on this strategy, we fabricated a red exciplex containing 1,3,5-triazine-2,4,6-triyl)tris(benzene-3,1-diyl)tris(diphenylphosphine oxide) (PO-T2T) and tris(2-phenylpyridine) iridium(III) (Ir(ppy)3) as components and realize a red emission with a peak at 604 nm, a CIE coordinate of (0.55, 0.44), and a high maximum external quantum efficiency of 5% in organic light-emitting device. This efficiency is 2.6 times higher than that of the device based on the conventional red exciplex emitter, proving the superiority of our novel strategy to construct TADF exciplexes with phosphors.

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Novel iridium(iii) complexes bearing dimesitylboron groups with nearly 100% phosphorescent quantum yields for highly efficient organic light-emitting diodes

Abstract: The solution-processed OLEDs based on IrIII complexes with high ΦP can show a maximum ηL of 85.1 cd A−1, ηP of 69.7 lm W−1, and ηext of 28.1%.

Cited by 49 publications

References 79 publications

Using Simple Fused‐Ring Thieno[2,3‐d]pyrimidine to Construct Orange/Red Ir(III) Complexes: High‐Performance Red Organic Light‐Emitting Diodes with EQEs up to Nearly 28%

Using Simple Fused‐Ring Thieno[2,3‐d]pyrimidine to Construct Orange/Red Ir(III) Complexes: High‐Performance Red Organic Light‐Emitting Diodes with EQEs up to Nearly 28%

Rational Design of π-Conjugated Tricoordinated Organoboron Derivatives With Thermally Activated Delayed Fluorescent Properties for Application in Organic Light-Emitting Diodes

Development of Red Exciplex for Efficient OLEDs by Employing a Phosphor as a Component

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