TY - JOUR
T1 - Origin of electrophosphorescence from a doped polymer light emitting diode
AU - Campbell, A. J.
AU - Blau, W.
AU - Lane, P. A.
AU - Palilis, L. C.
AU - Cadby, A. J.
AU - Bradley, D. D.C.
AU - Giebeler, C.
AU - Lidzey, D. G.
AU - O’Brien, D. F.
N1 - Generated from Scopus record by KAUST IRTS on 2019-11-27
PY - 2001/1/1
Y1 - 2001/1/1
N2 - The origin of electrophosphorescence from a doped polymer light emitting diode (LED) has been investigated. 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 (formula presented) was obtained at a concentration of (formula presented) PtOEP by weight. Energy transfer mechanisms between PFO and PtOEP were studied by absorption, photoluminescence, and photoinduced absorption spectroscopy. Even though electroluminescence spectra were dominated by PtOEP at a concentration of only (formula presented) PtOEP, Förster 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. © 2001 The American Physical Society.
AB - The origin of electrophosphorescence from a doped polymer light emitting diode (LED) has been investigated. 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 (formula presented) was obtained at a concentration of (formula presented) PtOEP by weight. Energy transfer mechanisms between PFO and PtOEP were studied by absorption, photoluminescence, and photoinduced absorption spectroscopy. Even though electroluminescence spectra were dominated by PtOEP at a concentration of only (formula presented) PtOEP, Förster 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. © 2001 The American Physical Society.
UR - https://link.aps.org/doi/10.1103/PhysRevB.63.235206
UR - http://www.scopus.com/inward/record.url?scp=85038266217&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.63.235206
DO - 10.1103/PhysRevB.63.235206
M3 - Article
SN - 1550-235X
VL - 63
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 23
ER -