Four-membered red iridium(<scp>iii</scp>) complexes with Ir–S–C–S structures for efficient organic light-emitting diodes

Su, Ning; Li, Fang‐Ling; Zheng, You‐Xuan

doi:10.1039/d0tc01312a

Cited by 18 publications

(9 citation statements)

References 36 publications

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“…Their principal advantage lies in efficient triplet harvesting, which allowed the full utilization of both electrically generated singlet and triplet excitons, following fast singlet-to-triplet intersystem crossing imposed by facile heavy-atom-enhanced spin–orbit coupling. , In general, in addition to the stronger chemical and metal-chelate dative bonding, , phosphors with a sufficiently short radiative lifetime are highly demanding for the device longevity and triplet harvesting. − This is due to the fact that the phosphors with a sufficiently short radiative lifetime are capable to compete with other deactivation processes. In fact, both green- and red-emitting Ir(III) phosphors with relatively short radiative lifetimes have already been synthesized and used in the fabrication of OLEDs. − …”

Section: Introductionmentioning

confidence: 99%

Rational Tuning of Bis-Tridentate Ir(III) Phosphors to Deep-Blue with High Efficiency and Sub-microsecond Lifetime

Tai

Gnanasekaran

Chen

et al. 2021

ACS Appl. Mater. Interfaces

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A new class of bis-tridentate Ir(III) complexes (Dap-1−4) was synthesized using carbene pincer pro-chelates PC1•H 3 (PF 6 ) 2 or PC2•H 3 (PF 6 ) 2 with either imidazolylidene or imidazo [4,5-b]pyridin-2-ylidene appendages, together with a second cyclometalating 2,6-diaryoxypyridine chelate, L1H 2 and L2H 2 , differed by a NMe 2 donor at the central pyridinyl fragment. The respective emission tuning between the ultraviolet and blue region was rationalized using time-dependent density functional theory (TD-DFT) approaches. Next, a highly efficient blue emitter (Dap-5) was synthesized by concomitant addition of two methyl groups and a single CF 3 substituent at the central phenyl and peripheral imidazo[4,5-b]pyridin-2-ylidene entities of the carbene pincer chelate, respectively. The organic light-emitting diode (OLED) device with 15 wt % Dap-5 in DPEPO shows electroluminescence at 468 nm and with CIE (0.14, 0.15) and a max external quantum efficiency (max EQE) of 16.8% with low efficiency roll-off (EQE of 14.4% at 1000 cd m −2 ); the latter is attributed to the relatively shortened triplet excitedstate radiative lifetime. These results highlight the adequateness of bis-tridentate Ir(III) phosphors in fabrication of practical blue-emitting OLEDs.

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Section: Introductionmentioning

confidence: 99%

Rational Tuning of Bis-Tridentate Ir(III) Phosphors to Deep-Blue with High Efficiency and Sub-microsecond Lifetime

Tai

Gnanasekaran

Chen

et al. 2021

ACS Appl. Mater. Interfaces

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“…To tune the emission color to red, the introduction of electron-donating groups and extended conjugation effect in the cyclometalating ligand design strategy have been used. 31,148 In 2014, Han et al 149 designed two complexes based on FIrpic (complex Ir- 1 ) by altering the 2-(2,4-difluorophenyl)pyridine moiety in the cyclometalating ligand. The alterations were performed to gain insight into the conjugation effect.…”

Section: Resultsmentioning

confidence: 99%

Computational aspects to design iridium complexes as emitters for OLEDs

Lakshmi

Mahalakshmi

2022

Mol. Syst. Des. Eng.

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“…The electrochemical properties are determined by using a CH electrochemical workstation in anhydrous DCM containing 0.1 M tetrabutylammonium hexafluorophosphate (TBAPF 6 ) as the supporting electrolyte. The ionization potential (IP) and the electron affinity (EA) are calculated from the onset potentials using the equations, E IP = −(4.8 + E ox ) and E EA = −(4.8 + E re ), respectively. The calculated IP values are in the range of −5.01 to −5.42 eV, and EA levels are in between −2.47 and −2.91 eV (Table ), which supports these macrocyclic rings for stable charge ejection .…”

Section: Resultsmentioning

confidence: 99%

Solution-Processable meso-Triarylamine Functionalized Porphyrins with a High Mobility and ON/OFF Ratio in Bottom-Gated Organic Field-Effect Transistors

Kurlekar

Anjali

Sonalin

et al. 2020

ACS Appl. Electron. Mater.

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A series of metal-free porphyrin molecules with functionalized triarylamines at the meso-position are designed and synthesized. All the functionalized porphyrins possess good thermal stability and high decomposition temperatures over 422 °C and also exhibited electrochemical reproducibility. The calculated ionization potentials are in the range of −5.01 to -5.42 eV, and electron affinity levels are in between −2.47 and −2.91 eV, which supports stable charge ejection. Organic fieldeffect transistor (OFET) devices with bottom-gate/top-contact architecture are fabricated by a solution-processable technique. OFETs with an active layer of porphyrin with electron-accepting trifluorophenyl groups gave the highest charge carrier mobility of 4.4 cm 2 /Vs and an on/off ratio of 10 7 . The obtained results indicate these compounds to be efficient hole-transporting materials. This research work presents the highest mobilities of the porphyrins reported until now.

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Four-membered red iridium(iii) complexes with Ir–S–C–S structures for efficient organic light-emitting diodes

Abstract: Three sulfur atom containing red Ir(iii) complexes were synthesized rapidly at room temperature in 5 min with high yields and their OLEDs show an EQEmax of up to 26.10%.

Cited by 18 publications

References 36 publications

Rational Tuning of Bis-Tridentate Ir(III) Phosphors to Deep-Blue with High Efficiency and Sub-microsecond Lifetime

Rational Tuning of Bis-Tridentate Ir(III) Phosphors to Deep-Blue with High Efficiency and Sub-microsecond Lifetime

Computational aspects to design iridium complexes as emitters for OLEDs

Solution-Processable meso-Triarylamine Functionalized Porphyrins with a High Mobility and ON/OFF Ratio in Bottom-Gated Organic Field-Effect Transistors

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