Organic light emitting devices with enhanced outcoupling via microlenses fabricated by imprint lithography

@article{citeulike:956160, abstract = {High efficiency white organic light emitting devices (WOLEDs) with optical outcoupling enhanced by hexagonal polymethylmethacrylate microlens arrays fabricated by imprint lithography on a glass substrate are demonstrated. Monte Carlo and finite difference time domain simulations of the emitted light are used to optimize the microlens design. The measured enhancement of light outcoupling and the angular dependence of the extracted light intensity are in agreement with the simulation. Using microlens arrays, we demonstrate a fluorescent/phosphorescent WOLED with a maximum external quantum efficiency of (14.3\&\#177;0.3)\% at 900\ \ cd/m2 and power efficiency of 21.6\&\#177;0.5\ \ lm/W at 220\ \ cd/m2. The electroluminescent spectra at viewing angles from normal to the substrate plane, to 60\° off normal, remain almost unchanged, giving a color rendering index of 87. \©2006 American Institute of Physics}, author = {Sun, Yiru and Forrest, Stephen R. }, citeulike-article-id = {956160}, doi = {http://dx.doi.org/10.1063/1.2356904}, journal = {Journal of Applied Physics}, keywords = {flexible-electronics, macroelectronics, oled}, number = {7}, posted-at = {2006-11-21 23:02:16}, priority = {2}, publisher = {AIP}, title = {Organic light emitting devices with enhanced outcoupling via microlenses fabricated by imprint lithography}, url = {http://dx.doi.org/10.1063/1.2356904}, volume = {100}, year = {2006} }

TY - JOUR ID - citeulike:956160 L3 - citeulike-article-id:956160 N2 - High efficiency white organic light emitting devices (WOLEDs) with optical outcoupling enhanced by hexagonal polymethylmethacrylate microlens arrays fabricated by imprint lithography on a glass substrate are demonstrated. Monte Carlo and finite difference time domain simulations of the emitted light are used to optimize the microlens design. The measured enhancement of light outcoupling and the angular dependence of the extracted light intensity are in agreement with the simulation. Using microlens arrays, we demonstrate a fluorescent/phosphorescent WOLED with a maximum external quantum efficiency of (14.3±0.3)% at 900  cd/m2 and power efficiency of 21.6±0.5  lm/W at 220  cd/m2. The electroluminescent spectra at viewing angles from normal to the substrate plane, to 60° off normal, remain almost unchanged, giving a color rendering index of 87. ©2006 American Institute of Physics IS - 7 JF - Journal of Applied Physics TI - Organic light emitting devices with enhanced outcoupling via microlenses fabricated by imprint lithography PB - AIP VL - 100 KW - flexible-electronics KW - macroelectronics KW - oled AU - Sun, Yiru AU - Forrest, Stephen PY - 2006/// UR - http://dx.doi.org/10.1063/1.2356904 ER -