High EQE of 43.76% in solution-processed OLEDs operating at a wavelength of 626 nm DOI

Jingtao Zhang,

Mengge Wu, Ding Zheng

et al.

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 125(12)

Published: Sept. 16, 2024

Simultaneously achieving high-efficiency, deep-red emission, and solution-processed organic light-emitting diodes (OLEDs) remains a huge challenge. In this work, thermally activated delayed fluorescent (TADF) material of CzPXZ that exhibits aggregation-induced emission property phosphorescent emitter Ir(dmppy)(piq)2(od) are developed to build effective energy transfer pathways by dissolving them in non-polar solvent. The electroluminescent peaks CzPXZ:Ir(III)-based OLEDs located at 626 nm, demonstrating efficient from the Ir(III) complex. Furthermore, an optimized DPEPO hole-blocking layer is utilized such Ir(III)-doped enhance radiative recombination. Therefore, high external quantum efficiency 43.76% achieved for OLEDs. This work sheds light on great potential AIE-TADF red emitters solution-processed,

Language: Английский

Acceptor Copolymerized Axially Chiral Conjugated Polymers with TADF Properties for Efficient Circularly Polarized Electroluminescence DOI Creative Commons
Wenlong Zhao,

Ke‐Ke Tan,

Wei‐Chen Guo

et al.

Advanced Science, Journal Year: 2024, Volume and Issue: 11(23)

Published: March 29, 2024

Abstract Chiral conjugated polymer has promoted the development of efficient circularly polarized electroluminescence (CPEL) device, nevertheless, it remains a challenge to develop chiral polymers with high performance. Herein, by acceptor copolymerization axially biphenyl emitting skeleton and benzophenone, pair namely R ‐ PAC S are synthesized. The target exhibit obvious thermally activated delayed fluorescence (TADF) activities photoluminescence quantum yields 81%. Moreover, display significant luminescence features, dissymmetry factor (| g lum |) nearly 3 × 10 −3 . By using as emitters, corresponding organic light‐emitting diodes (CP‐OLEDs) CPEL signals | EL 3.4 maximum external efficiency (EQE max ) 17.8%. Notably, considering both EQE comprehensively, device performance is best among all reported CP‐OLEDs emitters. This work provides facile approach constructing TADF discloses potential luminescent skeletons in architecting high‐performance CP‐OLEDs.

Language: Английский

Citations

9
Self‐Assembled Chiral Polymers Exhibiting Amplified Circularly Polarized Electroluminescence DOI

Ke‐Ke Tan,

Wei‐Chen Guo, Wenlong Zhao

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: July 16, 2024

Circularly polarized electroluminescence (CPEL) is highly promising in realm of 3D display and optical data storage. However, designing a groundbreaking chiral material with high comprehensive CPEL performance remains formidable challenge. In this work, pair polymers self-assembled behavior designed by integrating BN-moiety into polyfluorene backbone, named R-PBN S-PBN, respectively. The show narrowband emission centered at 490 nm full-width half maximum (FWHM) 29 photoluminescence quantum yield (PLQY) 79 %. After thermal annealing treatment, the undergo self-assembly, exhibiting amplified circularly luminescence (CPL) asymmetry factor (|g

Language: Английский

Citations

5
Thermally Activated Delayed Fluorescence Polymers and Their Application in Organic Light-Emitting Diodes DOI
Tao Wang, Yanxiang Cheng, Chuluo Yang

et al.

Progress in Polymer Science, Journal Year: 2024, Volume and Issue: unknown, P. 101892 - 101892

Published: Oct. 1, 2024

Language: Английский

Citations

5
Circularly Polarized Electroluminescence from Organic Emitters DOI
Mingjun Ji, Meng Li, Chuan‐Feng Chen

et al.

Published: Jan. 1, 2025

Language: Английский

Citations

0
Aggregation‐induced circularly polarized luminescence and delayed fluorescence enabled by activating high‐level reverse intersystem crossing DOI Creative Commons

Ke Wang,

Xinwen Ou,

Xiaofei Niu

et al.

Aggregate, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 25, 2024

Abstract Circularly polarized luminescence (CPL) materials with delayed fluorescence have attracted much attention due to their ability efficiently trap triplet state excitons, thereby improving the photoluminescence quantum yields of CPL materials. However, effort has been normally focused on utilization T 1 excitons but seldom higher excited n ( > 1) excitons. Rational manipulation and suppression Kasha's rule remains a major challenge. Herein, two gold complex enantiomers (( R / S )‐BPAuBC) based axially chiral binaphthyls 3,6‐Di‐tert‐butylcarbazole groups are synthesized systematically investigated. These exhibit aggregation‐induced circularly fluorescence. was found be enabled by activating high‐level reverse intersystem crossing (hRISC). The anti‐Kasha phosphorescence at 77 K proves that exciton large population in high‐lying 2 , which allows effective hRISC process cross back singlet emit In addition, “on–off” switching is further achieved nanoparticles acid–base stimulus, showing its potential as an responsive material.

Language: Английский

Citations

3
Self‐Assembled Chiral Polymers Exhibiting Amplified Circularly Polarized Electroluminescence DOI

Ke‐Ke Tan,

Wei‐Chen Guo, Wenlong Zhao

et al.

Angewandte Chemie, Journal Year: 2024, Volume and Issue: 136(42)

Published: July 16, 2024

Abstract Circularly polarized electroluminescence (CPEL) is highly promising in realm of 3D display and optical data storage. However, designing a groundbreaking chiral material with high comprehensive CPEL performance remains formidable challenge. In this work, pair polymers self‐assembled behavior designed by integrating BN‐moiety into polyfluorene backbone, named R‐PBN S‐PBN , respectively. The show narrowband emission centered at 490 nm full‐width half maximum (FWHM) 29 photoluminescence quantum yield (PLQY) 79 %. After thermal annealing treatment, the undergo self‐assembly, exhibiting amplified circularly luminescence (CPL) asymmetry factor (| g lum |) up to 0.11. Moreover, solution‐processed nondoped CP‐OLEDs based on as emitting layers exhibit external efficiency (EQE max ) 9.8 %, intense activities | EL 0.07, small FWHM 36 nm, simultaneously. This represents first case that combines EQE, large value emission.

Language: Английский

Citations

2
Chirality inducing units in organic TADF molecules: a way to circularly polarized luminescence DOI
Diksha Thakur, Sivakumar Vaidyanathan

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(34), P. 13168 - 13229

Published: Jan. 1, 2024

Circularly polarized luminescence (CPL) from chiral TADF molecules.

Language: Английский

Citations

2
Multistate circularly polarized luminescence switches based on dual stimuli-responsive chiral [2]rotaxanes DOI

Weitao Xu,

Xue Li,

Xiao‐Qin Xu

et al.

Science China Chemistry, Journal Year: 2024, Volume and Issue: 67(12), P. 4202 - 4211

Published: Aug. 15, 2024

Language: Английский

Citations

2
High EQE of 43.76% in solution-processed OLEDs operating at a wavelength of 626 nm DOI

Jingtao Zhang,

Mengge Wu, Ding Zheng

et al.

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 125(12)

Published: Sept. 16, 2024

Simultaneously achieving high-efficiency, deep-red emission, and solution-processed organic light-emitting diodes (OLEDs) remains a huge challenge. In this work, thermally activated delayed fluorescent (TADF) material of CzPXZ that exhibits aggregation-induced emission property phosphorescent emitter Ir(dmppy)(piq)2(od) are developed to build effective energy transfer pathways by dissolving them in non-polar solvent. The electroluminescent peaks CzPXZ:Ir(III)-based OLEDs located at 626 nm, demonstrating efficient from the Ir(III) complex. Furthermore, an optimized DPEPO hole-blocking layer is utilized such Ir(III)-doped enhance radiative recombination. Therefore, high external quantum efficiency 43.76% achieved for OLEDs. This work sheds light on great potential AIE-TADF red emitters solution-processed,

Language: Английский

Citations

0