Electroluminescent Properties of OLEDs with a Rubrene Sub-Monolayer Inserted between Electron-and Hole-Transport Layers

Matsumura, Michio; Furukawa, Takumi

doi:10.7567/ssdm.2001.f-8-2

Cited by 1 publication

(1 citation statement)

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“…This is different from the function of rubrene, which is supposed to directly recombine the electrons and holes into the molecules themselves. 6,7) In the NPB (40 nm)/Alq3 (60 nm) structure in this study, the electron-hole recombination zone was in close proximity to the NPB/Alq 3 interface and inside the Alq3 layer. The electrons and holes injected from the cathode and the anode, respectively, recombine in the recombination zone as excitons which retain their high energy, diffuse away from the recombination zone, and wait to transfer their energy to the DCJT dopants to emit light.…”

Section: Resultsmentioning

confidence: 56%

Separately Doped Structures for Red Organic Light-Emitting Diodes

Yang¹,

Tsai

Juang³

et al. 2005

Jpn. J. Appl. Phys.

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This paper reports on the separately-doped structures of organic light-emitting diodes (OLED) in which red dye 4-(dicyanomethylene)-2-methyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJT) was doped into the host emitting layer of tris(8-hydroxyquinoline)aluminum (Alq3) by means of ultrathin separate doping (like quantum wells). The parameters in the ultrathin layer, including its width, position, number and spacing between separately doped layers, were changed to study their effects on electroluminescence (EL) characteristics. Thin doped layers increase the luminance efficiency. When the ultrathin separately doped layers were in the vicinity of the NPB/Alq3 interface, where N,N'-diphenyl-N,N'-bis(1-naphthyl)-(1,1'-biphenyl)-4,4'-diamine (NPB) is used as a hole transport layer, luminance efficiency also increased. The highest luminance efficiency reaching 4 cd/A was achieved using a double ultrathin separately doped structure with optimum doping thickness and 2 nm of space between the two layers. The study also found that double ultrathin separately doped structures achieved better EL intensity than single or triple ultrathin separately doped structures.

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Section: Resultsmentioning

confidence: 56%