کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5375517 1504300 2009 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Triplet dynamics and charge carrier trapping in triplet-emitter doped conjugated polymers
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Triplet dynamics and charge carrier trapping in triplet-emitter doped conjugated polymers
چکیده انگلیسی
Phosphorescent (Ph) properties and charge carrier trapping have been studied in conjugated polymer CNPPP with incorporated red-emitting Btp2Ir(acac) metal-organic complex by time-resolved photoluminescence and thermally-stimulated luminescence (TSL) techniques. We characterized intrinsic Ph of CNPPP matrix and dynamics of triplet excitations of Btp2Ir(acac) confined by the polymer host. Combined studies of time and intensity dependence of guest Ph have demonstrated that the observed decrease in the Ph efficiency in CNPPP:Btp2Ir(acac) system at increasing excitation intensity is dominated by mutual host-guest triplet-triplet annihilation. We observed Ph spectral diffusion effects at 10 wt.% of Btp2Ir(acac) dispersed in a polymer matrix, which is a proof for the triplet excitons migration though the manifold of triplet-emitter sites, and which governs the Ph concentration quenching effect. TSL measurements have provided direct evidence that the triplet-emitter molecules create a deep charge trap in the conjugated polymer and allowed trap characterization.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 358, Issues 1–2, 30 March 2009, Pages 147-155
نویسندگان
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