Origin of electrophosphorescence from a doped polymer light emitting diode
Citation:
Lane, PA, Palilis, LC, O'Brien, DF, Giebeler, C, Cadby, AJ, Lidzey, DG, Campbell, AJ, Blau, W, Bradley, DDC, Origin of electrophosphorescence from a doped polymer light emitting diode, Physical Review B - Condensed Matter and Materials Physics, 63, 23, 2001, 235206 -Download Item:
Abstract:
The origin of electrophosphorescence from a doped polymer light emitting diode(LED)has been investi-
gated. A luminescent polymer host, poly (9,9-dioctylfluorene)(PFO), was doped with a red phosphorescent dye, 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrin platinum(II)
(PtOEP). The maximum external quantum
efficiency of 3.5% was obtained at a concentration of 4% PtOEP by weight. Energy transfer mechanisms
between PFO and PtOEP were studied by absorption, photoluminescence, and photoinduced absorption spec-
troscopy. Even though electroluminescence spectra were dominated by PtOEP at a concentration of only
0.2 wt % PtOEP, Forster transfer of singlet excitons was weak and there was no evidence for Dexter transfer of triplet excitons. We conclude that the dominant emission mechanism in doped LED?s is charge trapping
followed by recombination on PtOEP molecules.
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http://people.tcd.ie/wblauDescription:
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Author: BLAU, WERNER
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Physical Review B - Condensed Matter and Materials Physics;63;
23;
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Dexter transferMetadata
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