Enhanced performance of molecular organic light-emitting diodes on polyester substrates

George M. Daly; Hideyuki Murata; Charles D. Merritt; Michael C. Miller; Zakya H. Kafafi; Hiroshi Inada; Yasuhiko Shirota

doi:10.1117/12.295547

1 December 1997 Enhanced performance of molecular organic light-emitting diodes on polyester substrates

George M. Daly, Hideyuki Murata, Charles D. Merritt, Michael C. Miller, Zakya H. Kafafi, Hiroshi Inada, Yasuhiko Shirota

Author Affiliations +

Proceedings Volume 3148, Organic Light-Emitting Materials and Devices; (1997) https://doi.org/10.1117/12.295547
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

Enhanced performance has been observed for molecular organic light emitting diodes (MOLEDs) consisting of two to four organic layers sequentially vacuum vapor deposited onto patterned indium-tin oxide (ITO) on polyester (PET) films. For the device structures studied, the performance of diodes fabricated on polyester is comparable to or better than their analogs on glass substrates. For example, at 100 A/m², a luminous power efficiency of 4.4 lm/W and external quantum yield of 2.7 percent is observed for a device structure consisting of two hole transport layers, a doped emitting layer and an electron transport layer on a polyester substrate. The same device made on a glass substrate has a luminous power efficiency of 3.5 lm/W and external quantum yield of 2.3 percent. The enhanced performance of the plastic MOLEDs is attributed to increased optical output coupling. Electrical and optical performance for comparative device structures has been characterized by current-voltage-luminance measurements and electroluminescence spectra, and ITO surface morphology has been studied by Atomic Force Microscopy.

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George M. Daly, Hideyuki Murata, Charles D. Merritt, Michael C. Miller, Zakya H. Kafafi, Hiroshi Inada, and Yasuhiko Shirota "Enhanced performance of molecular organic light-emitting diodes on polyester substrates", Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997); https://doi.org/10.1117/12.295547

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