Fast synthesis of iridium(<scp>iii</scp>) complexes with sulfur-containing ancillary ligand for high-performance green OLEDs with EQE exceeding 31%

Lu, Guangzhao; Tu, Zhen‐Long; Liu, Liang; Zhang, Wenwei; Zheng, You‐Xuan

doi:10.1039/c9tc01397k

Cited by 20 publications

(8 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They possess 31.24% external quantum efficiency. 154 Zhang et al designed four complexes ( Ir- 27 , Ir- 28 , Ir- 29 and Ir- 30 ) by changing the substitution on the ancillary ligand, which were synthesized and characterized experimentally. The HOMO–LUMO gap remained almost the same for all four complexes, and their emission wavelengths were in the range of yellowish-green.…”

Section: Resultsmentioning

confidence: 99%

Computational aspects to design iridium complexes as emitters for OLEDs

Lakshmi

Mahalakshmi

2022

Mol. Syst. Des. Eng.

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 99%

Computational aspects to design iridium complexes as emitters for OLEDs

Lakshmi

Mahalakshmi

2022

Mol. Syst. Des. Eng.

View full text Add to dashboard Cite

show abstract

“…As the most widely used luminescent guest material in practical organic light-emitting diodes (OLEDs), the iridium(III) complex has achieved great development in the past decades [1][2][3]. Until now, part of green, yellow and red iridium complexes have been used in commercial OLEDs [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Phenylpyrimidine-Based Iridium Complex for High-Performance Green-Yellow Phosphorescent Organic Light-Emitting Diodes

Zhang

Li³

et al. 2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

In this work, a phenylpyrimidine-based green-yellow iridium complex, (bpp)2Ir(acac), is prepared. Tert-butyl group is introduced to weaken the intermolecular interaction and endow (bpp)2Ir(acac) with favorable physical properties. Phosphorescent device which utilizes (bpp)2Ir(acac) as the luminescent guest material displays high efficiencies (73.9 cd/A, 84.8 lm/W, 21.2%), low efficiency roll-off (from 100 to 10000 cd/m2: 5.1%), relatively low concentration sensitivity (from 5% to 12%) and very stable electroluminescent spectra (from 1 cd/m2 to maximum luminance). As a consequence of the results proved that (bpp)2Ir(acac) is a good phosphorescent material.

show abstract

“…The strong spin–orbital coupling effect in C ∧ N cyclometalated Ir(III) complexes gives rise to their intense room-temperature phosphorescence and relatively short lifetimes of triplet excited states. − Beneficially, organic light-emitting diodes (OLEDs) consisting of C ∧ N cyclometalated Ir(III) complexes generally can harvest both electrically generated 25% singlet excitons and 75% triplet excitons for light emission and realize a theoretical 100% internal quantum efficiency (IQE). − Thereby, C ∧ N cyclometalated Ir(III) complexes seem to be innately ideal phosphors for OLEDs. − Importantly, the photophysical characteristics of C ∧ N cyclometalated Ir(III) complexes are susceptible to and mainly dominated by the electronic nature of the C ∧ N cyclometalating ligands. − This provides a versatile platform to design Ir(III) phosphorescent emitters with expected performance. In the past decades, great efforts have been devoted to synthesis of novel and relatively complicated cyclometalating ligands or functionalization of cyclometalating ligands for developing highly efficient Ir-based phosphors. − However, obtaining these relatively complicated cyclometalating ligands suffers tedious organic synthetical processes, which sometimes is harmful to the thermal stability of the concerned Ir(III) complexes. , Thereby, cyclometalated Ir(III) complexes containing easily synthesized cyclometalating ligands are much more preferred for practical application as high-performance Ir-based phosphors in OLEDs.…”

Section: Introductionmentioning

confidence: 99%

Unsymmetric Heteroleptic Ir(III) Complexes with 2-Phenylquinoline and Coumarin-Based Ligand Isomers for Tuning Character of Triplet Excited States and Achieving High Electroluminescent Efficiencies

Zhao

Yang

et al. 2020

Inorg. Chem.

View full text Add to dashboard Cite

2-Phenylquinoline (PQ) and four coumarin-based ligand isomers with ease of synthesis have been selected to construct the unsymmetric heteroleptic [Ir(C 1 ∧ N)(C 2 ∧ N)-(acac)]-type complex phosphors for organic light-emitting diodes (OLEDs). Six unsymmetric heteroleptic Ir(III) complexes have been obtained by employing four coumarin-based ligand isomers (L-C5/L-C6/L-C7/L-C8) in the [Ir(PQ)(C ∧ N)(acac)] structure due to two different coordinating carbon atoms in ligands L-C6 and L-C7 to form C−Ir bond. Through adopting unsymmetric heteroleptic [Ir(C 1 ∧ N)(C 2 ∧ N)(acac)] structure, these Ir(III) complexes can not only achieve impressive absolute quantum yield Φ p (ca. 0.5−1.0), higher than that of complex [Ir(PQ) 2 (acac)] (ca. 0.4), but also realize a dual modulation of both emission color from orange (AIrC6out, λ = 578 nm) to red (AIrC5, λ = 622 nm) and the character of the lowest triplet excited states (T 1 ), showing both 3 MLCT character and 3 ILCT (intraligand charge transfer) character in their T 1 states. AIrC5, AIrC7out, and AIrC7in show MLCT character from Ir(III) center to ligand L-C5 or L-C7 and ILCT character in ligand L-C5 or L-C7 in their T 1 states, while AIrC6out, AIrC6in, and AIrC8 show MLCT character from Ir(III) center to ligand PQ and ILCT character in ligand PQ in their T 1 states. Moreover, the color-tuning mechanism and the lowest triplet state characters are investigated in detail. AIrC6in and AIrC8 were selected as emitters to evaluate the electroluminescent (EL) performance due to their high Φ P of nearly up to unity. Optimal orange-emitting device B2 based on AIrC8 can give a maximum external quantum efficiency (η ext ) of 23.9%, a maximum current efficiency (η L ) of 70.9 cd A −1 , and a maximum power efficiency (η P ) of 60.7 lm W −1 . All these impressive results can definitely demonstrate the effectiveness of our simple approach for tuning character of the triplet excited states and achieving high-performance Ir-based phosphors in OLEDs.

show abstract

Fast synthesis of iridium(iii) complexes with sulfur-containing ancillary ligand for high-performance green OLEDs with EQE exceeding 31%

Abstract: Three green iridium(iii) complexes were rapidly synthesized at room temperature with a sulfur-containing ligand, and OLEDs fabricated using them show high performances with EQEmax of 31.24% and low efficiency roll-off.

Cited by 20 publications

References 36 publications

Computational aspects to design iridium complexes as emitters for OLEDs

Computational aspects to design iridium complexes as emitters for OLEDs

Phenylpyrimidine-Based Iridium Complex for High-Performance Green-Yellow Phosphorescent Organic Light-Emitting Diodes

Unsymmetric Heteroleptic Ir(III) Complexes with 2-Phenylquinoline and Coumarin-Based Ligand Isomers for Tuning Character of Triplet Excited States and Achieving High Electroluminescent Efficiencies

Contact Info

Product

Resources

About