dorsal/arxiv
View SchemaDoped and non-doped organic light-emitting diodes based on a yellow carbazole emitter into a blue-emitting matrix
| Authors | Hakim Choukri, Alexis Fischer, Sebastien Forget, Sebastien Chenais, Marie-Claude Castex, Bernard Geffroy, Dominique Ades, Alain Siove |
|---|---|
| Categories | |
| ArXiv ID | physics/0701228 |
| URL | https://arxiv.org/abs/physics/0701228 |
Abstract
A new carbazole derivative with a 3,3'-bicarbazyl core 6,6'-substituted by dicyanovinylene groups (6,6'-bis(1-(2,2'-dicyano)vinyl)-N,N'-dioctyl-3,3'-bicarbazyl; named (OcCz2CN)2, was synthesized by carbonyl-methylene Knovenagel condensation, characterized and used as a component of multilayer organic light-emitting diodes (OLEDs). Due to its -donor-acceptor type structure, (OcCz2CN)2 was found to emit a yellow light at max=590 nm (with the CIE coordinates x=0.51; y = 0.47) and was used either as a dopant or as an ultra-thin layer in a blue-emitting matrix of 4,4'-bis(2,2'-diphenylvinyl)-1,1'-biphenyl (DPVBi). DPVBi (OcCz2CN)2-doped structure exhibited, at doping ratio of 1.5 weight %, a yellowish-green light with the CIE coordinates (x = 0.31; y = 0.51), an electroluminescence efficiency EL=1.3 cd/A, an external quantum efficiency ext= 0.4 % and a luminance L= 127 cd/m2 (at 10 mA/cm2) whereas for non-doped devices utilizing the carbazolic fluorophore as a thin neat layer, a warm white with CIE coordinates (x = 0.40; y= 0.43), EL= 2.0 cd/A, ext= 0.7 %, L = 197 cd/m2 (at 10 mA/cm2) and a color rendering index (CRI) of 74, were obtained. Electroluminescence performances of both the doped and non-doped devices were compared with those obtained with 5,6,11,12-tetraphenylnaphtacene (rubrene) taken as a reference of highly efficient yellow emitter.
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"abstract": "A new carbazole derivative with a 3,3\u0027-bicarbazyl core 6,6\u0027-substituted by\ndicyanovinylene groups\n(6,6\u0027-bis(1-(2,2\u0027-dicyano)vinyl)-N,N\u0027-dioctyl-3,3\u0027-bicarbazyl; named\n(OcCz2CN)2, was synthesized by carbonyl-methylene Knovenagel condensation,\ncharacterized and used as a component of multilayer organic light-emitting\ndiodes (OLEDs). Due to its \u0026#61552;-donor-acceptor type structure, (OcCz2CN)2\nwas found to emit a yellow light at \u0026#61548;max=590 nm (with the CIE\ncoordinates x=0.51; y = 0.47) and was used either as a dopant or as an\nultra-thin layer in a blue-emitting matrix of\n4,4\u0027-bis(2,2\u0027-diphenylvinyl)-1,1\u0027-biphenyl (DPVBi). DPVBi (OcCz2CN)2-doped\nstructure exhibited, at doping ratio of 1.5 weight %, a yellowish-green light\nwith the CIE coordinates (x = 0.31; y = 0.51), an electroluminescence\nefficiency \u0026#61544;EL=1.3 cd/A, an external quantum efficiency \u0026#61544;ext= 0.4\n% and a luminance L= 127 cd/m2 (at 10 mA/cm2) whereas for non-doped devices\nutilizing the carbazolic fluorophore as a thin neat layer, a warm white with\nCIE coordinates (x = 0.40; y= 0.43), \u0026#61544;EL= 2.0 cd/A, \u0026#61544;ext= 0.7 %,\nL = 197 cd/m2 (at 10 mA/cm2) and a color rendering index (CRI) of 74, were\nobtained. Electroluminescence performances of both the doped and non-doped\ndevices were compared with those obtained with 5,6,11,12-tetraphenylnaphtacene\n(rubrene) taken as a reference of highly efficient yellow emitter.",
"arxiv_id": "physics/0701228",
"authors": [
"Hakim Choukri",
"Alexis Fischer",
"Sebastien Forget",
"Sebastien Chenais",
"Marie-Claude Castex",
"Bernard Geffroy",
"Dominique Ades",
"Alain Siove"
],
"categories": [
"physics.optics"
],
"title": "Doped and non-doped organic light-emitting diodes based on a yellow carbazole emitter into a blue-emitting matrix",
"url": "https://arxiv.org/abs/physics/0701228"
},
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