Organic light-emitting diodes using spherical aggregates

Chihaya Adachi; Seiji Hibino; Asuka Yamamori; Masahiro Uchida; Toshiki Koyama; Yoshio Taniguchi

doi:10.1117/12.279347

1 December 1997 Organic light-emitting diodes using spherical aggregates

Chihaya Adachi, Seiji Hibino, Asuka Yamamori, Masahiro Uchida, Toshiki Koyama, Yoshio Taniguchi

Proceedings Volume 3148, Organic Light-Emitting Materials and Devices; (1997) https://doi.org/10.1117/12.279347
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

We have succeeded in fabricating submicrometer-sized organic light emitting diodes (OLED) with bright emission using a polymer blend. The cell structure was composed of ITO/hole transport layer(polymer blend layer)/emitting layer/MgAg. We used poly (methyl methacrylate) (PMMA) as an inert host material and N,N'-diphenyl-N,N'-bias(3- methylphenyl)-(1,1'-biphenyl)-4,4'-diamine- polycarbonate (PC-TPD) as a guest material. The polymer blend layers showed various morphology depending on the concentration of PC-TPD. With 2 wt percent of PC-TPD, and PC-TPD formed submicrometer-sized spherical domains, actually prolate spheroids, in the PMMA host layer. The domain diameters were around 200 nm according to AFM and SEM observations. The OLED including such a blend structure showed aggregation of bright submicrometer-sized electroluminescence spots. The number of working diodes exceeded four million per square centimeter.

Citation Download Citation

Chihaya Adachi, Seiji Hibino, Asuka Yamamori, Masahiro Uchida, Toshiki Koyama, and Yoshio Taniguchi "Organic light-emitting diodes using spherical aggregates", Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997); https://doi.org/10.1117/12.279347

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