Excimer Formation by Poly(N-vinylcarbazole) in Solution

Yokoyama, Masaaki; Tamamura, Toshiaki; Atsumi, Miharu; Yoshimura, Motomu; Shirota, Yasuhiko; Mikawa, Hiroshi

doi:10.1021/ma60044a002

Cited by 102 publications

(37 citation statements)

References 10 publications

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“…Table pear to form, to any great extent, in alternating copolymers of NVCz and fumaronitrile. 25 The pro-1). Consequently, we propose that this component could be associated with the presence of ''unposal finds further support as described below.…”

Section: 4mentioning

confidence: 99%

“…The reactivity ratios of NVCz (r 1 ) and MA (r 2 ) were calculated following the vide more information on the mechanism of carbazole excimer formation, has been suggested. [25][26][27] method of Kelen and Tudos, 38 yielding values of 0.02 and 0.61, respectively. The sequence distriFor example, Yokoyama et al 25 have investigated copolymers of NVCz with fumaronitrile, diethyl bution of NVCz units in each of the copolymers was also calculated and can be found with referfumerate, and diethyl maleate in dilute solution.…”

Section: Introductionmentioning

confidence: 99%

“…[25][26][27] method of Kelen and Tudos, 38 yielding values of 0.02 and 0.61, respectively. The sequence distriFor example, Yokoyama et al 25 have investigated copolymers of NVCz with fumaronitrile, diethyl bution of NVCz units in each of the copolymers was also calculated and can be found with referfumerate, and diethyl maleate in dilute solution. The fact that these alternating copolymers exhibit ence to Table I.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photophysics of carbazole-containing systems. 1. Dilute solution behavior of poly(N-vinyl carbazole) and N-vinyl carbazole/methyl acrylate copolymers

Davidson

Soutar

Swanson

et al. 1997

J. Polym. Sci. B Polym. Phys.

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Section: 4mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photophysics of carbazole-containing systems. 1. Dilute solution behavior of poly(N-vinyl carbazole) and N-vinyl carbazole/methyl acrylate copolymers

Davidson

Soutar

Swanson

et al. 1997

J. Polym. Sci. B Polym. Phys.

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“…In addition, the ''second excimers" have also been indicated as mainly intramolecular types of excited dimers. This seems to be supported by the fact that no ''sandwich-like excimer" emission was observed in solutions of alternating copolymers of 9-vinylcarbazole [39].…”

Section: Resultsmentioning

confidence: 91%

Thermoluminescence of poly(9-vinylcarbazole) modified by substitution with halogens

et al. 2008

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“…Devices with a PVK-only active layer emit at 410 nm, which can be ascribed to a mix of PVK singlet and PVK excimer emission, [20] whereas time resolved EL spectra of devices with PVK:PBD peak at 437 nm; this emission can be ascribed to the exciplex formed between the HOMO of PVK and the LUMO of PBD. Interestingly, we observe exciplex emission in Type 2 devices up to 1 ms, which we ascribe to emission from the exciplex triplet state.…”

Section: 2 Iridium(iii)bis[2-(24-difluorophenyl)-4-(246-trimethymentioning

confidence: 99%

The role of exciplex states in phosphorescent OLEDs with poly(vinylcarbazole) (PVK) host

Jankus

Abdullah

Griffiths

et al. 2015

Organic Electronics

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NOTICE: this is the author's version of a work that was accepted for publication in Psychology of Organic Electronics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Organic Electronics, 20, May 2015, 10.1016/j.orgel.2015 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. PLEDs would enable printing of display or lighting panels on large area substrates that could substantially reduce fabrication costs by avoiding expensive vacuum processes presently used in OLED technologies. PVK is one of the most popular hosts for blue PLEDs. However, PVK has very poor electron transport properties and oxadiazole based electron dopants, e.g.PBD or OXD-7, are used to improve charge transport. This is generally ascribed to capture and transport of electrons on the PBD or OXD-7. Here we show that this is not necessarily the only reason for improved efficiency upon PVK doping. We demonstrate that devices with PVK doped with PBD or OXD-7 have emission lasting up to 1 ms which in some cases may be greater than prompt emission from excitons formed initially on the dopant. This long-lived emission is arising mainly due to formation of an exciplex between the PVK and PBD / OXD-7. This exciplex state then repopulates dopant iridium complexes over a long period of 2 time giving very long-lived emission. We also note, that this exciplex-fed long-lived emission from heavy metal complexes is observed in several PLEDs with PBD and PVK (and also OXD-7) doped with blue or green iridium phosphors indicating this to be a general phenomenon.Manuscript text

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Excimer Formation by Poly(N-vinylcarbazole) in Solution

Cited by 102 publications

References 10 publications

Photophysics of carbazole-containing systems. 1. Dilute solution behavior of poly(N-vinyl carbazole) and N-vinyl carbazole/methyl acrylate copolymers

Photophysics of carbazole-containing systems. 1. Dilute solution behavior of poly(N-vinyl carbazole) and N-vinyl carbazole/methyl acrylate copolymers

Thermoluminescence of poly(9-vinylcarbazole) modified by substitution with halogens

The role of exciplex states in phosphorescent OLEDs with poly(vinylcarbazole) (PVK) host

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