Improved light out-coupling in organic light emitting diodes employing ordered microlens arrays

Autor:	S. R. Forrest, S. Möller
Rok vydání:	2002
Předmět:	Microlens Materials science business.industry General Physics and Astronomy Substrate (electronics) Flat glass law.invention Lens (optics) Optics law OLED Optoelectronics Quantum efficiency business Layer (electronics) Light-emitting diode
Zdroj:	Journal of Applied Physics. 91:3324-3327
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.1435422
Popis:	We demonstrate that ordered microlens arrays with 10 μm diam poly-dimethyl-siloxane lenses attached to glass substrates increase the light output of organic light emitting devices (OLED) by a factor of 1.5 over unlensed substrates. The lenses, which are considerably smaller than, and not aligned to the OLEDs, outcouple light that is emitted outside of the escape cone of the substrate. We show that an electrophosphorescent device based on a fac tris(2-phenylpyridine)Iridium (Ir(ppy)3) doped emitting layer has its external quantum efficiency increased from 9.5% using a flat glass substrate, to 14.5% at low current densities using a substrate with microlenses. No change in the emission spectrum is observed for different viewing angles using the lens arrays.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d7711a256c18f6304cd1d8b0fbd10d2f https://doi.org/10.1063/1.1435422 Zobrazit plný text záznamu