Electrophosphoresence from a doped polymer light emitting diode

D. F. O'Brien; C. Giebeler; R. B. Fletcher; A. J. Cadby; L. C. Palilis; D. G. Lidzey; P. A. Lane; D. D.C. Bradley; W. Blau

doi:10.1016/S0379-6779(00)00441-0

Electrophosphoresence from a doped polymer light emitting diode

D. F. O'Brien, C. Giebeler, R. B. Fletcher, A. J. Cadby, L. C. Palilis, D. G. Lidzey, P. A. Lane, D. D.C. Bradley, W. Blau

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148 Scopus citations

Abstract

The photophysics and device physics of a phosphorescent polymer light emitting diode (LED) have been investigated. The emissive host, poly(9,9-dioctylfluorene) (PFO), was doped to a variety of concentrations between 0.2 and 8% with a red emissive phosphorescent dye, 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrin platinum(II) (PtOEP). The energy transfer mechanisms between the host and the dopant were studied using both photoluminescence (PL) and photo-induced absorption techniques. Forster transfer was observed from the host to the dopant, but no evidence of Dexter transfer was obtained. Electroluminescent (EL) devices prepared from PFO/PtOEP blends showed a maximum external quantum efficiency (QE) of 3.5% and a peak brightness >200 cd/m2. We attribute this high efficiency to the capturing of both singlet and triplet excitons by direct charge trapping on the PtOEP molecules. Finally, we report that the EL and PL quantum efficiencies show notably different dopant concentration dependencies. This questions the linkage between the PL and EL quantum efficiencies in doped organic systems.

Original language	English (US)
Journal	Synthetic Metals
Volume	116
Issue number	1-3
DOIs	https://doi.org/10.1016/S0379-6779(00)00441-0
State	Published - Jan 1 2001
Externally published	Yes

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Generated from Scopus record by KAUST IRTS on 2019-11-27

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title = "Electrophosphoresence from a doped polymer light emitting diode",

abstract = "The photophysics and device physics of a phosphorescent polymer light emitting diode (LED) have been investigated. The emissive host, poly(9,9-dioctylfluorene) (PFO), was doped to a variety of concentrations between 0.2 and 8% with a red emissive phosphorescent dye, 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrin platinum(II) (PtOEP). The energy transfer mechanisms between the host and the dopant were studied using both photoluminescence (PL) and photo-induced absorption techniques. Forster transfer was observed from the host to the dopant, but no evidence of Dexter transfer was obtained. Electroluminescent (EL) devices prepared from PFO/PtOEP blends showed a maximum external quantum efficiency (QE) of 3.5% and a peak brightness >200 cd/m2. We attribute this high efficiency to the capturing of both singlet and triplet excitons by direct charge trapping on the PtOEP molecules. Finally, we report that the EL and PL quantum efficiencies show notably different dopant concentration dependencies. This questions the linkage between the PL and EL quantum efficiencies in doped organic systems.",

author = "O'Brien, {D. F.} and C. Giebeler and Fletcher, {R. B.} and Cadby, {A. J.} and Palilis, {L. C.} and Lidzey, {D. G.} and Lane, {P. A.} and Bradley, {D. D.C.} and W. Blau",

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year = "2001",

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doi = "10.1016/S0379-6779(00)00441-0",

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T1 - Electrophosphoresence from a doped polymer light emitting diode

AU - O'Brien, D. F.

AU - Giebeler, C.

AU - Fletcher, R. B.

AU - Cadby, A. J.

AU - Palilis, L. C.

AU - Lidzey, D. G.

AU - Lane, P. A.

AU - Bradley, D. D.C.

AU - Blau, W.

N1 - Generated from Scopus record by KAUST IRTS on 2019-11-27

PY - 2001/1/1

Y1 - 2001/1/1

N2 - The photophysics and device physics of a phosphorescent polymer light emitting diode (LED) have been investigated. The emissive host, poly(9,9-dioctylfluorene) (PFO), was doped to a variety of concentrations between 0.2 and 8% with a red emissive phosphorescent dye, 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrin platinum(II) (PtOEP). The energy transfer mechanisms between the host and the dopant were studied using both photoluminescence (PL) and photo-induced absorption techniques. Forster transfer was observed from the host to the dopant, but no evidence of Dexter transfer was obtained. Electroluminescent (EL) devices prepared from PFO/PtOEP blends showed a maximum external quantum efficiency (QE) of 3.5% and a peak brightness >200 cd/m2. We attribute this high efficiency to the capturing of both singlet and triplet excitons by direct charge trapping on the PtOEP molecules. Finally, we report that the EL and PL quantum efficiencies show notably different dopant concentration dependencies. This questions the linkage between the PL and EL quantum efficiencies in doped organic systems.

AB - The photophysics and device physics of a phosphorescent polymer light emitting diode (LED) have been investigated. The emissive host, poly(9,9-dioctylfluorene) (PFO), was doped to a variety of concentrations between 0.2 and 8% with a red emissive phosphorescent dye, 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrin platinum(II) (PtOEP). The energy transfer mechanisms between the host and the dopant were studied using both photoluminescence (PL) and photo-induced absorption techniques. Forster transfer was observed from the host to the dopant, but no evidence of Dexter transfer was obtained. Electroluminescent (EL) devices prepared from PFO/PtOEP blends showed a maximum external quantum efficiency (QE) of 3.5% and a peak brightness >200 cd/m2. We attribute this high efficiency to the capturing of both singlet and triplet excitons by direct charge trapping on the PtOEP molecules. Finally, we report that the EL and PL quantum efficiencies show notably different dopant concentration dependencies. This questions the linkage between the PL and EL quantum efficiencies in doped organic systems.

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U2 - 10.1016/S0379-6779(00)00441-0

DO - 10.1016/S0379-6779(00)00441-0

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VL - 116

JO - Synthetic Metals

JF - Synthetic Metals

IS - 1-3

ER -

Electrophosphoresence from a doped polymer light emitting diode

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