Type

Journal Article

Authors

Werner Blau

Subjects

Chemistry

Topics
absorption luminescent polymer light emitting diode dexter transfer polymer energy transfer doped quantum efficiency

Origin of electrophosphorescence from a doped polymer light emitting diode (2001)

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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Full list of authors on original publication

Werner Blau

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Werner Blau
Trinity College Dublin
Total Publications: 109