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 журналСтатья

26 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

Предметные области ASJC Scopus

  • Materials Science(all)

Предметные области WoS

  • Нанотехнологии
  • Материаловедение, Междисциплинарные труды

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