Emission characteristics of OLEDs on planar and non-planar substrates

被引：0

作者：

Scheffel, M ^{[1
]}

Birnstock, J ^{[1
]}

Hunze, A ^{[1
]}

Paetzold, R ^{[1
]}

Rau, L ^{[1
]}

Rogler, W ^{[1
]}

Voegele, S ^{[1
]}

Winnacker, A ^{[1
]}

机构：

[1] Siemens Corp Technol, CT MM 1, Erlangen, Germany

来源：

ORGANIC AND POLYMERIC MATERIALS AND DEVICES | 2003年 / 771卷

关键词：

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We report on light extraction experiments with polyfluorene based organic light emitting diodes (OLEDs). The intensity distribution of emission within the substrate and within air is determined experimentally. For the devices investigated in this study, we find that the external quantum efficiency can be increased by a factor of 1.82, in the case of complete suppression of waveguiding within the substrate. The experimental data is in good agreement with modeling results based on dipole emission within a multilayer system. As a consequence of these findings, we modified the device topology by introducing light extraction structures between glass substrate and indium tin oxide anode. This results in redirection of photon trajectories and thus in a higher probability to extract waveguided radiation. At a luminance of 100 cd/m(2), the photometric efficiency for emission in forward direction is enhanced by a factor of 1.45 to 8.9 cd/A.

引用

页码：261 / 266

页数：6