Polyfluorene-based white light conjugated polymers incorporating orange iridium(<scp>iii</scp>) complexes: the effect of steric configuration on their photophysical and electroluminescent properties

Sun, Jing; Wu, Dongyu; Gao, Long; Hou, Minna; Lu, Guojing; Li, Jie; Zhang, Xinwen; Miao, Yanqin; Wang, Hua; Xu, Bingshe

doi:10.1039/c7ra11204a

Cited by 12 publications

(14 citation statements)

References 35 publications

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“…In this way, coordination compounds are a group of materials well represented by tris -(8-hydroxyquinoline)aluminum salt (Alq 3 ), which was successfully applied as an active layer and an electron transport material in OLEDs . This molecule is a representative example once it possesses all of the required properties for a good device cell performance: high thermal and chemical stabilities, high emission quantum yield, and significant values of electrical charge mobility. − In addition, and different from other examples, − this coordination compound is made of abundant metal ions with a simple synthetic process, which makes it cheaper . Therefore, the obtention of materials with these properties is a permanent challenge.…”

Section: Introductionmentioning

confidence: 99%

The Balance between Charge Mobility and Efficiency in All-Solution-Processed Organic Light-Emitting Diodes of Zn(II) Coordination Compounds/PFO Composites

et al. 2020

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Zn(II) coordination compounds with asymmetric salicylidene ligands in poly [9,9-dioctylfluorenyl-2,7-diyl] (PFO) composites were used for all-solution-processable white organic light-emitting diode (WOLED) purposes. These Zn(II) complexes were strategically synthesized to optimize their electronic structures, starting from the widespread known salophen core. Vertical excitation energies and natural transition orbital (NTO) densities of Zn(salicylidenes) were evaluated using density functional theory/time-dependent density functional theory (DFT/TD-DFT) at the PBE0/6−311++G(d,p) level of theory, presenting good accuracy to their experimental optical properties. Diodes were assembled with Zn(salicylidenes) dispersed into a PFOconducting polymer matrix at 0.1, 0.5, 1.0, and 2.5 % mol•mol -1 with the architecture: ITO|PEDOT:PSS|PVK|PFO:Zn(salicylidene)|Ca|Al. The electrical properties of the diodes are dependent on the relative concentration of the coordination compounds in the polymer matrix, where an optimized performance was obtained using diluted samples. The modified Zn(salophen) derivatives (II and III) also presented greater performance compared to the precursor Zn(salophen) (I). In addition, interesting color tunability was obtained depending on the device composition, and for Zn(BTS) with 0.1 and 0.5%, we obtained coordinated color emission very similar to white (0.27, 0.36) and (0.29, 0.41), respectively. The observed color was a composition of the polymeric blue emission and green emission from the coordination compounds. The discussion of the efficiency was based on the determination of the carrier mobilities using the trap-charge limited current (TCLC) model. According to these values, the best performance of the diodes with Zn(BTS) is due to a pronounced increase of the charge mobility compared to the polymer itself and other coordination compounds.

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Section: Introductionmentioning

confidence: 99%

The Balance between Charge Mobility and Efficiency in All-Solution-Processed Organic Light-Emitting Diodes of Zn(II) Coordination Compounds/PFO Composites

et al. 2020

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“…As demonstrated by our group, various kinds of iridium(III) complex cored hyperbranched conjugated polymers are designed to explore the influences of steric configuration on their photophysics and potential applications in high‐performance PLEDs . Selecting the heteroleptic pyridyltriazole‐based iridium(III) complex as the core as shown in Scheme , by tuning position of substituent on iridium(III) complex, the polymers (83–85) show various steric configurations (linear and hyperbranched structures), and significant changes are observed in the emission of iridium(III) complexes . In contrast to linear conjugated polymers, hyperbranched conjugated polymers exhibit the white light‐emitting, the best film forming properties and thermal stability.…”

Section: Organic Light‐emitting Materialsmentioning

confidence: 99%

High‐Performance Organic Electroluminescence: Design from Organic Light‐Emitting Materials to Devices

Tao

Miao

Wang

et al. 2018

The Chemical Record

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Organic electroluminescence is considered as the most competitive alternative for the future solid-state displays and lighting techniques owing to many advantages such as selfluminescence, high efficiency, high contrast, high color rendering index, ultra-thin thickness, transparency, flat and flexibility, etc. The development of high-performance organic electroluminescence has become the continuing focus of research. In this personal account, a brief overview of representative achievements in our study on the design of highly efficient novel organic light-emitting materials (including fluorescent materials, phosphorescent iridium(III) complexes and conjugated polymers bearing phosphorescent iridium(III) complex) and highperformance device structures together with working principles are given. At last, we will give some perspectives on this fascinating field, and also try to provide some potential directions of research on the basis of the current stage of organic electroluminescence. Wiley Online Library 1537 Scheme 5. The chemical structures of cationic iridium(III) complexes based on various N N ligands (18-23).Figure 7. UV-vis absorption (a) and PL (b) of 18-23 in CH 2 Cl 2 . [30] Figure 35. (a) The device structure and proposed working mechanism for WOLED with sandwiched blue EML; (b) The normalized EL spectra of WOLED at the voltage of 5-7 V, and corresponding luminance, CIE, CCT, and CRI are also given. [65a]

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“…applications due to their high phosphorescent efficiency and color tuning associated with the 3 MLCT (MLCT = metal-to-ligand charge transfer) transition. Aggressively, toward the practical utilization for full-color flat-panel display and solid-state lighting, − Ir(III)-complex-based white organic/polymer light-emitting diodes (WOLEDs/WPLEDs; vacuum-deposited WOLEDs, − solution-processed WOLEDs, − and WPLEDs based on doping − or grafting − into a polymer host) are highly concerned. Solution-processed WPLEDs − with Ir(III)-complex-incorporated (doping − or grafting − ) polymers as the emitting layers (EMLs) are more cost-effective for large-area scalable production due to high material utilization rate.…”

Section: Introductionmentioning

confidence: 99%

All-Solution-Processed Multilayered White Polymer Light-Emitting Diodes (WPLEDs) Based on Cross-Linked [Ir(4-vb-PBI)₂(acac)]

Miao

et al. 2021

ACS Appl. Mater. Interfaces

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All-solution-processed multilayered white polymer light-emitting diodes (WPLEDs) are promising candidates for low-cost and large-area flexible full-color flat-panel displays and solid-state lighting. However, it is still challenging to improve their performance. In this work, based on an elegant strategy of orthogonal materials, the utilization of the cross-linked Ir3+ polymer film poly(NVK-co-[Ir(4-vb-PBI) 2 (acac)]- co -NVK) (NVK = N-vinyl-carbazole; 4-vb-HPBI = 1-(4-vinylbenzyl)-2-phenyl-1H-benzo[d]imidazole; and Hacac = acetylacetone) as the emitting layer (EML) between a hydrophilic polymer film poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as the hole injection layer (HIL) and a hydrophobic polymer film poly(vinyl-PBD) (vinyl-PBD = 2-(4-(tert-butyl)phenyl)-5-(4′-vinyl-[1,1′-biphenyl]-4-yl)-2,5-dihydro-1,3,4-oxadiazole) as the electron transport layer (ETL) led to the successful fabrication of reliable all-solution-processed multilayered WPLEDs. The device exhibits a ηCE Max of 18.19 cd/A, a ηPE Max of 8.16 lm/W, and a ηEQE Max of 9.32% with stable white light (Commission International De L’Eclairage (CIE) coordinates x = 0.269–0.283, y = 0.317–0.330; corrected color temperatures (CCTs) of 7237–8199 K, and CRIs (color rendering indices) of 63–72) under a wide applied-voltage range. Its high performance, especially with record efficiencies among those of reported all-solution-processed WPLEDs, renders cross-linked Ir3+ polymers a new platform to all-solution-processed multilayered WPLEDs.

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Polyfluorene-based white light conjugated polymers incorporating orange iridium(iii) complexes: the effect of steric configuration on their photophysical and electroluminescent properties

Abstract: Owing to large steric hindrance, white light hyperbranched conjugated polymers exhibited the best electroluminescent performance with suppression of triplet–triplet annihilation.

Cited by 12 publications

References 35 publications

The Balance between Charge Mobility and Efficiency in All-Solution-Processed Organic Light-Emitting Diodes of Zn(II) Coordination Compounds/PFO Composites

The Balance between Charge Mobility and Efficiency in All-Solution-Processed Organic Light-Emitting Diodes of Zn(II) Coordination Compounds/PFO Composites

High‐Performance Organic Electroluminescence: Design from Organic Light‐Emitting Materials to Devices

All-Solution-Processed Multilayered White Polymer Light-Emitting Diodes (WPLEDs) Based on Cross-Linked [Ir(4-vb-PBI)₂(acac)]

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Polyfluorene-based white light conjugated polymers incorporating orange iridium(iii) complexes: the effect of steric configuration on their photophysical and electroluminescent properties

Abstract: Owing to large steric hindrance, white light hyperbranched conjugated polymers exhibited the best electroluminescent performance with suppression of triplet–triplet annihilation.

Cited by 12 publications

References 35 publications

The Balance between Charge Mobility and Efficiency in All-Solution-Processed Organic Light-Emitting Diodes of Zn(II) Coordination Compounds/PFO Composites

The Balance between Charge Mobility and Efficiency in All-Solution-Processed Organic Light-Emitting Diodes of Zn(II) Coordination Compounds/PFO Composites

High‐Performance Organic Electroluminescence: Design from Organic Light‐Emitting Materials to Devices

All-Solution-Processed Multilayered White Polymer Light-Emitting Diodes (WPLEDs) Based on Cross-Linked [Ir(4-vb-PBI)2(acac)]

Contact Info

Product

Resources

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All-Solution-Processed Multilayered White Polymer Light-Emitting Diodes (WPLEDs) Based on Cross-Linked [Ir(4-vb-PBI)₂(acac)]