Abstract
We demonstrated a new approach to fabricate microlens arrays attached to an
organic light-emitting diode (OLED) to improve the outcoupling efficiency.
Polydimethylsiloxane (PDMS) microlens arrays were fabricated by imprint lithography. Two
kinds of photoresists were used to make a mold to imprint the microlens array. Using
this simple and low-cost fabrication process, a maximum of 43% luminance enhancement was
acquired with the green OLED. When attaching the microlens array to a green OLED, the
efficacy and power efficiency were increased by 42% and 69% at 900 cd/m<sup>2</sup>,
respectively. The external quantum efficiency of the OLED with the microlens array was
increased by 59% at 7.5 mA/cm<sup>2</sup> due to luminance enhancement at a large
viewing angle without spectral change. Additionally, the image blur problem is
quantitatively analyzed by defining “blur width.” The image blur problem induced by the
microlens array is reduced by adopting the microlens array with lower height while the
luminance enhancement by the microlens array remained.
© 2011 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription