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
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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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 10Â 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 1â2, 30 March 2009, Pages 147-155
Journal: Chemical Physics - Volume 358, Issues 1â2, 30 March 2009, Pages 147-155
نویسندگان
A. Kadashchuk, S. Schols, A. Vakhnin, J. Genoe, P. Heremans,