Abstract
In this paper, we report bright, efficient Alq3-based [tris-(8-hydroxyquinoline) aluminum]
organic light-emitting diode (OLED) structures that incorporate hemispherical
lenses for increased output power efficiency. The 6-layer hybrid (polymer/small
molecule) OLED structure contains two spin-coated polymer layers and four
thermally evaporated small molecule layers. This structure results in balanced
charge injection, thus leading to a more efficient device. The use of index-matched
transparent lenses resulted in luminous and external quantum efficiency of
7.5 lm/W and 8%, respectively. The size and shape of the lens was used to
control the angular power distribution. Lenses incorporating color conversion
media were used to achieve high OLED efficiency in various colors. Saturated
yellow, orange, and red devices with external quantum efficiencies as high ~4 were obtained from this
approach.
© 2006 IEEE
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