1 December 1997 Triazole-containing copolymer for use as an electron transport material in multilayer LEDs
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Abstract
We report investigations into a poly(1,20-distyrylbenzene- co-1,2-[4-(p-ethylphenyl)]triazole) (TRIDSB) electron transport material and its incorporation into single and multilayer LEDs. Multilayer devices have been investigated with poly(p-phenylenevinylene) (PPV) and poly(2-methoxy-5- (2'-ethylhexyloxy)-1,4-phenylenevinylene) as hole transport layers (HTLs). The incorporation of the polymer into an ITO/PPV/TRIDSB/Al LED facilitates electron injection into the hole transporting emissive layer and results in a ten fold increase in the external quantum efficiency for electroluminescence (EL) of the PPV layer from 0.008 percent to 0.08-0.1 percent. In an ITO/I-MEHPPV/TRIDSB/Al device the corresponding increase in the quantum efficiency for EL from the 1-MEHPPV is fifty fold, from 0.002 percent to between 0.06-0.11 percent. The polymer has been shown to be thermally stable with no glass transition temperature or melting point detected within the range 25-250 degrees C.
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Alan W. Grice, Ali R. Tajbakhsh, Paul L. Burn, Donal D. C. Bradley, "Triazole-containing copolymer for use as an electron transport material in multilayer LEDs", Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997); doi: 10.1117/12.279327; https://doi.org/10.1117/12.279327
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KEYWORDS
Electron transport

Polymers

Electroluminescence

Light emitting diodes

External quantum efficiency

Aluminum

Electrodes

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