Optical excitations in transition metal containing poly-ynes

H. F. Wittmann*, K. Fuhrmann, R. H. Friend, M. S. Khan, J. Lewis

*المؤلف المقابل لهذا العمل

نتاج البحث: المساهمة في مجلةمراجعة النظراء

32 اقتباسات (Scopus)

ملخص

We have measured the optical properties of poly[trans(bis(tributylphosphine))platinum(1,4) phenylenediethynylene)]. In this polymer, conjugated phenylenediethynylene units are linked by square-planar coordinated platinum to form a linear chain. We consider that in contrast to hydrocarbon conjugated polymers, the presence of the heavy metal atom on the chain allows transitions between the singlet and triplet manifolds. We see π conjugation that extends through the metal sites. Strong singlet π-π* absorption peaks at 3.26 eV, and weaker triplet absorption peaks at 2.43 eV at room temperature. Strong photoluminescence from triplet to ground state peaks at 2.38 eV, and weak photolumiscence from the excited singlet peaks at 3.06 eV at low temperatures also see photoinduced absorption which peaks at 1.49 eV, and which shows the same temperature and temporal dependence as the strong luminescence, with a lifetime of 30 μsecs at 10 K. We associate this feature with a triplet to triplet transition. We consider that these measurements provide a direct probe of the exchange energy for the excitons which are primarily located on the π-conjugated section of the chain.

اللغة الأصليةEnglish
الصفحات (من إلى)56-61
عدد الصفحات6
دوريةSynthetic Metals
مستوى الصوت55
رقم الإصدار1
المعرِّفات الرقمية للأشياء
حالة النشرPublished - مارس 15 1993
منشور خارجيًانعم

ASJC Scopus subject areas

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  • ???subjectarea.asjc.2500.2506???
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