A phosphorescent poly(dendrimer) with increased viscosity for solution-processed OLED devices

Levell, Jack W.; Gunning, Jack P.; Burn, Paul L.; Robertson, Jeremy; Samuel, Ifor D. W.

doi:10.1016/j.orgel.2010.05.011

Cited by 24 publications

(23 citation statements)

References 33 publications

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“…4) which had a 2-(2-pyridyl)-1,3,4-triazole ligand and a norbornenyl polymer backbone instead of the 2-phenyl-1,3,4-triazole ligand and a polystyrene backbone in DIr-P1. 27 DIr-P2 showed a green emission with k PL at 497 nm and a shoulder at 525 nm in degassed DCM. Its U PL of 37% was slightly lower than that of the reference compound (DIr-M2, U PL : 53%), suggesting the presence of interchromophore interactions in the polymer due to the close proximity of iridium(III) phosphors along the polymer chain.…”

Section: Recent Advances In Non-conjugated Polymers For Pled Applicatmentioning

confidence: 97%

“…35 They found that the PLQYs of the polymer neat films decreased with increasing Ir(ppy) 3 phosphor concentrations (0.5-29 mol.%), suggesting the presence of undesirable interchromophore interactions in the film when the phosphor content became more concentrated, which is consistent with the observations reported in the aforementioned studies. 27,29,31 Although the copolymer with 0.5 mol.% Ir(ppy) 3 phosphor exhibited the best PLQY of 81% among the series, a minimum of 3 mol.% phosphor was required to complete the energy transfer from the host to the dopant. Thanks to the bipolar characteristics of the host to facilitate both hole and electron injections and transport, a single-layered PLED [ITO/AQ1200/Poly(M6-MAco-Ir-2C-MA) ($30 nm)/LiQ (2 nm)/Al (100 nm)] was fabricated, where a 6 mol.% phosphor was found to show the best compromise between PLQY and charge transport in the polymeric emitting layer.…”

Section: Recent Advances In Non-conjugated Polymers For Pled Applicatmentioning

confidence: 99%

“…33,126,127 Fig. 27. Chemical structure of cross-linkable deep-blue emitter based on triphenylene moiety (PCTP).…”

Section: Conjugated Versus Non-conjugated Polymers: Materials Preparatmentioning

confidence: 99%

See 2 more Smart Citations

Recent Advances in Polymer Organic Light-Emitting Diodes (PLED) Using Non-conjugated Polymers as the Emitting Layer and Contrasting Them with Conjugated Counterparts

Wong

2017

Journal of Elec Materi

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Polymer organic light-emitting diodes (PLED) are one of the most studied subjects in flexible electronics thanks to their economical wet fabrication procedure for enhanced price advantage of the product device. In order to optimize PLED efficiency, correlating the polymer structure with the device performance is essential. An important question for the researchers in this field is whether the polymer backbone is conjugated or not as it affects the device performance. In this review, recent advances in non-conjugated polymers employed as the emitting layer in PLED devices are first discussed, followed by their contrast with the conjugated counterparts in terms of polymer synthesis, sample quality, physical properties and device performances. Such comparison between conjugated and non-conjugated polymers for PLED applications is rarely attempted, and; hence, this review shall provide a useful insight of emitting polymers employed in PLEDs.

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Section: Recent Advances In Non-conjugated Polymers For Pled Applicatmentioning

confidence: 97%

Section: Recent Advances In Non-conjugated Polymers For Pled Applicatmentioning

confidence: 99%

See 1 more Smart Citation

Recent Advances in Polymer Organic Light-Emitting Diodes (PLED) Using Non-conjugated Polymers as the Emitting Layer and Contrasting Them with Conjugated Counterparts

Wong

2017

Journal of Elec Materi

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“…The efficiency of these PLEDs can be further improved by introduction of the hole‐transporting/electron‐blocking interlayer 4–6. Both mixtures of host polymers with luminescent small molecules7, 8 and luminescent polymers9 have been used as the active layer in such devices. Although the efficiency of PLEDs has been steadily improved, the device performance is still far from optimum.…”

Section: Introductionmentioning

confidence: 99%

New polymer matrix system for phosphorescent organic light‐emitting diodes and the role of the small molecular co‐host

Salert

Krueger

Bagnich

et al. 2012

J. Polym. Sci. A Polym. Chem.

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A new matrix system for phosphorescent organic light-emitting diodes (OLEDs) based on an electron transporting component attached to an inert polymer backbone, an electronically neutral co-host, and a phosphorescent dye that serves as both emitter and hole conductor are presented. The inert co-host is used either as small molecules or covalently connected to the same chain as the electron-transporting host. The use of a small molecular inert co-host in the active layer is shown to be highly advantageous in comparison to a purely polymeric matrix bearing the same functionalities. Analysis of the dye phosphorescence decay in pure polymer, small molecular co-host film, and their blend lets to conclude that dye molecules distribute mostly in the small molecular co-host phase, where the co-host prevents agglomeration and self-quenching of the phosphorescence as well as energy transfer to the electron transporting units. In addition, the co-host accumulates at the anode interface where it acts as electron blocking layer and improves hole injection. This favorable phase separation between polymeric and small molecular components results in devices with efficiencies of about 47 cd/A at a luminance of 1000 cd/m(2). Investigation of OLED degradation demonstrates the presence of two time regimes: one fast component that leads to a strong decrease at short times followed by a slower decrease at longer times. Unlike the long time degradation, the efficiency loss that occurs at short times is reversible and can be recovered by annealing of the device at 180 degrees C. We also show that the long-time degradation must be related to a change of the optical and electrical bulk properties

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“…It is possible to produce PLEDs using soluble processes such as spin coating, ink-jet printing, and spray coating. [1][2][3][4] It is highly desirable to prepare PLEDs with good interfacial and surface morphologies between electrode and organic films to improve the light quantum efficiency. In particular, it is important to optimize the electron and hole recombination process by introducing phosphorescent organic materials into the emission layer.…”

Section: Introductionmentioning

confidence: 99%

Properties of Flexible Phosphorescence Polymer Light Emitting Diodes Coated on Polyethylenenaphthalate Plastic Substrates

Baek

Gong²,

Chang

et al. 2012

j nanosci nanotechnol

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Flexible phosphorescence polymer light emitting diodes (PhPLEDs) with PEN/ITO/PEDOT:PSS/ PVK:Ir(ppy)3/TPBI/LiF/Al structure were fabricated to investigate the effects of Ir(ppy)3 doping concentrations on the optical and electrical properties of the devices. PVK and Ir(ppy)3 conjugated polymers as host and guest materials in the emission layer were spun coated at various concentrations of Ir(ppy)3 ranging from 2.0 to 8.0 vol%. As the concentration of Ir(ppy)3 increased from 2.0 to 6.0 vol%, the electrical and optical properties of the flexible PhPLEDs were improved clearly. Maximum luminance and current density were obtained for a PhPLED with an Ir(ppy)3 concentration of 6.0 vol%, with 6815 cd/m2 and 393 mA/cm2 at 9 V. The current efficiency tends to increase with the Ir(ppy)3 concentration, because of the formation of the excitons required to emit light.

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A phosphorescent poly(dendrimer) with increased viscosity for solution-processed OLED devices

Cited by 24 publications

References 33 publications

Recent Advances in Polymer Organic Light-Emitting Diodes (PLED) Using Non-conjugated Polymers as the Emitting Layer and Contrasting Them with Conjugated Counterparts

Recent Advances in Polymer Organic Light-Emitting Diodes (PLED) Using Non-conjugated Polymers as the Emitting Layer and Contrasting Them with Conjugated Counterparts

New polymer matrix system for phosphorescent organic light‐emitting diodes and the role of the small molecular co‐host

Properties of Flexible Phosphorescence Polymer Light Emitting Diodes Coated on Polyethylenenaphthalate Plastic Substrates

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