Measurement of photoluminescence efficiency of Ir(III) phenylpyridine derivatives in solution and solid-state films

Endo, Ayataka; Suzuki, Kengo; Yoshihara, Toshitada; Tobita, Seiji; Yahiro, Masayuki; Adachi, Chihaya

doi:10.1016/j.cplett.2008.05.064

Cited by 144 publications

(96 citation statements)

References 20 publications

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“…For its luminescence yield, for several years an incorrect value of 0.4 has been in the literature. More recently, it was shown to be as high as 0.75 in toluene [64] and 0.89 in dichloroethane [65]. Because of the long excited-state lifetimes (microseconds) quenching by oxygen is significant, and other quenchers may also cause problems.…”

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confidence: 99%

Standards for Photoluminescence Quantum Yield Measurements in Solution

Brouwer

2016

IUPAC Standards Online

153

178

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Link to publication Citation for published version (APA):Brouwer, A. M. (2011). Standards for photoluminescence quantum yield measurements in solution. Pure and Applied Chemistry, 83(12), 2213-2228. DOI: 10.1351/PAC-REP-10-09-31 General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Abstract: The use of standards for the measurement of photoluminescence quantum yields (QYs) in dilute solutions is reviewed. Only three standards can be considered well established. Another group of six standards has been investigated by several independent researchers. A large group of standards is frequently used in recent literature, but the validity of these is less certain. The needs for future development comprise: (i) confirmation of the validity of the QY values of many commonly used standard materials, preferably in the form of SI traceable standards; (ii) extension of the set of standard materials to the UV and near-IR spectral ranges; and (iii) good standards or robust protocols for the measurements of low QYs.

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confidence: 99%

Standards for Photoluminescence Quantum Yield Measurements in Solution

Brouwer

2016

IUPAC Standards Online

153

178

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“…• The subproduct Ir(ppy) 2 • and the distorted structure Ir(ppy) 3 -Nrot + fac have the same characteristics of cationic structure Ir(ppy) 3 + (g: 2.14307−4.02210), due to the high spin density on the Ir atom.…”

Section: Discussionmentioning

confidence: 98%

Light-Induced Structural Change in Iridium Complexes Studied by Electron Spin Resonance

et al. 2014

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Iridium-based compounds are materials of great interest in the production of highly efficient organic light emitting diodes and several other applications. However, these organometallic compounds present relative low stability due to photodegradation processes still not well understood. In this work we investigated paramagnetic states induced by UV photoexcitation on iridium(III) bis[(4,6-fluorophenyl)-pyridinato-N,C2′]picolinate (FIrpic) and iridium(III)-tris(2-phenylpyridine) (Ir(ppy) 3 ) complexes dispersed in different polymeric matrices by electron spin resonance (ESR). Photogenerated charged states with relatively strong hyperfine interactions were observed and attributed to matrix/complex charge-transfer processes. Measurements of the signal amplitude decay after photoexcitation interruption were performed as a function of temperature. The photoinduced centers are thermally activated with energy barrier between 0.3 and 0.6 eV. Electronic structure calculations suggest that the signals observed by ESR are associated with metastable negatively charged Ir complexes distorted structures.

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“…2,18,19 However, a faster nonexponential decay whose average lifetime ͑ av ͒ is shorter by one order of magnitude than that in solution were observed in neat films. [19][20][21][22] A single exponential decay with a lifetime between 48-56 ns was observed for neat Ir͑ppy͒ 3 film in the presence of the electric field.…”

Section: Figmentioning

confidence: 99%

Photo- and field-induced charge-separation and phosphorescence quenching in organometallic complex Ir(ppy)3

Mehata

Ohta

2011

Applied Physics Letters

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Electric field effects on absorption and photoluminescence ͑PL͒ spectra of organometallic phosphorescent emitter Ir͑ppy͒ 3 , ͕tris͓2-phenylpyridinato-C 2 ,N͔ iridium ͑III͖͒ doped in a film of polymethyl methacrylate ͑PMMA͒ have been confirmed at temperatures in the range of 40-295 K. Field-induced quenching of PL observed for Ir͑ppy͒ 3 is attributed to the decrease both of emitting state population and of the lifetime of PL. The quenching is independent of excitation energy as well as temperature. Field-assisted charge separation or dissociation of electron-hole ͑e-h͒ pair produced by photoexcitation may decrease the population of the emitting state. The Stark shifts on absorption and PL spectra have also been analyzed.

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Measurement of photoluminescence efficiency of Ir(III) phenylpyridine derivatives in solution and solid-state films

Cited by 144 publications

References 20 publications

Standards for Photoluminescence Quantum Yield Measurements in Solution

Standards for Photoluminescence Quantum Yield Measurements in Solution

Light-Induced Structural Change in Iridium Complexes Studied by Electron Spin Resonance

Photo- and field-induced charge-separation and phosphorescence quenching in organometallic complex Ir(ppy)3

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