Dinuclear Design of a Pt(II) Complex Affording Highly Efficient Red Emission: Photophysical Properties and Application in Solution-Processible OLEDs

Marsel Z. Shafikov, Ruth Daniels, Piotr Pander, Fernando B. Dias, J. A.Gareth Williams, Valery N. Kozhevnikov

Результат исследований: Вклад в журналСтатьяНаучно-исследовательскаярецензирование

3 Цитирования (Scopus)

Аннотация

The light-emitting efficiency of luminescent materials is invariably compromised on moving to the red and near-infrared regions of the spectrum due to the transfer of electronic excited-state energy into vibrations. We describe how this undesirable "energy gap law" can be sidestepped for phosphorescent organometallic emitters through the design of a molecular emitter that incorporates two platinum(II) centers. The dinuclear cyclometallated complex of a substituted 4,6-bis(2-thienyl)pyrimidine emits very brightly in the red region of the spectrum (λ max=610nm, Î=0.85 in deoxygenated CH2Cl2 at 300 K). The lowest-energy absorption band is extraordinarily intense for a cyclometallated metal complex: At λ=500nm, Îμ=53800M-1 cm-1 . The very high efficiency of emission achieved can be traced to an unusually high rate constant for the T1 â†' S0 phosphorescence process, allowing it to compete effectively with nonradiative vibrational decay. The high radiative rate constant correlates with an unusually large zero-field splitting of the triplet state, which is estimated to be 40cm-1 by means of variableerature time-resolved spectroscopy over the range 1.7<T<120K. The compound has been successfully tested as a red phosphor in an organic light-emitting diode prepared by solution processing. The results highlight a potentially attractive way to develop highly efficient red and NIR-emitting devices through the use of multinuclear complexes.
Язык оригиналаАнглийский
Страницы (с-по)8182-8193
Число страниц12
ЖурналACS Applied Materials and Interfaces
Том11
Номер выпуска8
DOI
СостояниеОпубликовано - 27 фев 2019

Отпечаток

Organic light emitting diodes (OLED)
Rate constants
Phosphorescence
Coordination Complexes
Energy absorption
Organometallics
Metal complexes
Platinum
Excited states
Phosphors
Absorption spectra
Energy gap
Spectroscopy
Infrared radiation
Processing
pyrimidine

Ключевые слова

    Предметные области ASJC Scopus

    • Materials Science(all)

    Предметные области WoS

    • Нанотехнологии
    • Материаловедение, Междисциплинарные труды

    Цитировать

    Shafikov, Marsel Z. ; Daniels, Ruth ; Pander, Piotr ; Dias, Fernando B. ; Williams, J. A.Gareth ; Kozhevnikov, Valery N. / Dinuclear Design of a Pt(II) Complex Affording Highly Efficient Red Emission: Photophysical Properties and Application in Solution-Processible OLEDs. В: ACS Applied Materials and Interfaces. 2019 ; Том 11, № 8. стр. 8182-8193.
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    title = "Dinuclear Design of a Pt(II) Complex Affording Highly Efficient Red Emission: Photophysical Properties and Application in Solution-Processible OLEDs",
    abstract = "The light-emitting efficiency of luminescent materials is invariably compromised on moving to the red and near-infrared regions of the spectrum due to the transfer of electronic excited-state energy into vibrations. We describe how this undesirable {"}energy gap law{"} can be sidestepped for phosphorescent organometallic emitters through the design of a molecular emitter that incorporates two platinum(II) centers. The dinuclear cyclometallated complex of a substituted 4,6-bis(2-thienyl)pyrimidine emits very brightly in the red region of the spectrum ({\^I}» max=610nm, {\^I}=0.85 in deoxygenated CH2Cl2 at 300 K). The lowest-energy absorption band is extraordinarily intense for a cyclometallated metal complex: At {\^I}»=500nm, {\^I}μ=53800M-1 cm-1 . The very high efficiency of emission achieved can be traced to an unusually high rate constant for the T1 {\^a}†' S0 phosphorescence process, allowing it to compete effectively with nonradiative vibrational decay. The high radiative rate constant correlates with an unusually large zero-field splitting of the triplet state, which is estimated to be 40cm-1 by means of variableerature time-resolved spectroscopy over the range 1.7<T<120K. The compound has been successfully tested as a red phosphor in an organic light-emitting diode prepared by solution processing. The results highlight a potentially attractive way to develop highly efficient red and NIR-emitting devices through the use of multinuclear complexes.",
    keywords = "deep-red luminescence, dinuclear platinum complex, electroluminescence, near-infrared emission, triplet harvesting, TRIPLET-STATE, EXCITED-STATES, COORDINATION-COMPOUNDS, CYCLOMETALATED PLATINUM COMPLEXES, EXTERNAL QUANTUM EFFICIENCY, LIGANDS, FLUORESCENCE, IRIDIUM(III) COMPLEXES, PHOSPHORESCENT DOPANTS, ELECTRONIC STATES",
    author = "Shafikov, {Marsel Z.} and Ruth Daniels and Piotr Pander and Dias, {Fernando B.} and Williams, {J. A.Gareth} and Kozhevnikov, {Valery N.}",
    year = "2019",
    month = "2",
    day = "27",
    doi = "10.1021/acsami.8b18928",
    language = "English",
    volume = "11",
    pages = "8182--8193",
    journal = "ACS Applied Materials and Interfaces",
    issn = "1944-8244",
    publisher = "American Chemical Society",
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    Dinuclear Design of a Pt(II) Complex Affording Highly Efficient Red Emission: Photophysical Properties and Application in Solution-Processible OLEDs. / Shafikov, Marsel Z.; Daniels, Ruth; Pander, Piotr; Dias, Fernando B.; Williams, J. A.Gareth; Kozhevnikov, Valery N.

    В: ACS Applied Materials and Interfaces, Том 11, № 8, 27.02.2019, стр. 8182-8193.

    Результат исследований: Вклад в журналСтатьяНаучно-исследовательскаярецензирование

    TY - JOUR

    T1 - Dinuclear Design of a Pt(II) Complex Affording Highly Efficient Red Emission: Photophysical Properties and Application in Solution-Processible OLEDs

    AU - Shafikov, Marsel Z.

    AU - Daniels, Ruth

    AU - Pander, Piotr

    AU - Dias, Fernando B.

    AU - Williams, J. A.Gareth

    AU - Kozhevnikov, Valery N.

    PY - 2019/2/27

    Y1 - 2019/2/27

    N2 - The light-emitting efficiency of luminescent materials is invariably compromised on moving to the red and near-infrared regions of the spectrum due to the transfer of electronic excited-state energy into vibrations. We describe how this undesirable "energy gap law" can be sidestepped for phosphorescent organometallic emitters through the design of a molecular emitter that incorporates two platinum(II) centers. The dinuclear cyclometallated complex of a substituted 4,6-bis(2-thienyl)pyrimidine emits very brightly in the red region of the spectrum (λ max=610nm, Î=0.85 in deoxygenated CH2Cl2 at 300 K). The lowest-energy absorption band is extraordinarily intense for a cyclometallated metal complex: At λ=500nm, Îμ=53800M-1 cm-1 . The very high efficiency of emission achieved can be traced to an unusually high rate constant for the T1 â†' S0 phosphorescence process, allowing it to compete effectively with nonradiative vibrational decay. The high radiative rate constant correlates with an unusually large zero-field splitting of the triplet state, which is estimated to be 40cm-1 by means of variableerature time-resolved spectroscopy over the range 1.7<T<120K. The compound has been successfully tested as a red phosphor in an organic light-emitting diode prepared by solution processing. The results highlight a potentially attractive way to develop highly efficient red and NIR-emitting devices through the use of multinuclear complexes.

    AB - The light-emitting efficiency of luminescent materials is invariably compromised on moving to the red and near-infrared regions of the spectrum due to the transfer of electronic excited-state energy into vibrations. We describe how this undesirable "energy gap law" can be sidestepped for phosphorescent organometallic emitters through the design of a molecular emitter that incorporates two platinum(II) centers. The dinuclear cyclometallated complex of a substituted 4,6-bis(2-thienyl)pyrimidine emits very brightly in the red region of the spectrum (λ max=610nm, Î=0.85 in deoxygenated CH2Cl2 at 300 K). The lowest-energy absorption band is extraordinarily intense for a cyclometallated metal complex: At λ=500nm, Îμ=53800M-1 cm-1 . The very high efficiency of emission achieved can be traced to an unusually high rate constant for the T1 â†' S0 phosphorescence process, allowing it to compete effectively with nonradiative vibrational decay. The high radiative rate constant correlates with an unusually large zero-field splitting of the triplet state, which is estimated to be 40cm-1 by means of variableerature time-resolved spectroscopy over the range 1.7<T<120K. The compound has been successfully tested as a red phosphor in an organic light-emitting diode prepared by solution processing. The results highlight a potentially attractive way to develop highly efficient red and NIR-emitting devices through the use of multinuclear complexes.

    KW - deep-red luminescence

    KW - dinuclear platinum complex

    KW - electroluminescence

    KW - near-infrared emission

    KW - triplet harvesting

    KW - TRIPLET-STATE

    KW - EXCITED-STATES

    KW - COORDINATION-COMPOUNDS

    KW - CYCLOMETALATED PLATINUM COMPLEXES

    KW - EXTERNAL QUANTUM EFFICIENCY

    KW - LIGANDS

    KW - FLUORESCENCE

    KW - IRIDIUM(III) COMPLEXES

    KW - PHOSPHORESCENT DOPANTS

    KW - ELECTRONIC STATES

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    U2 - 10.1021/acsami.8b18928

    DO - 10.1021/acsami.8b18928

    M3 - Article

    VL - 11

    SP - 8182

    EP - 8193

    JO - ACS Applied Materials and Interfaces

    JF - ACS Applied Materials and Interfaces

    SN - 1944-8244

    IS - 8

    ER -