Efficient polarized light-emitting diodes utilizing ultrathin photoaddressable alignment layers
- 23 September 2002
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 81 (13), 2319-2321
- https://doi.org/10.1063/1.1509117
Abstract
We demonstrate that an ultrathin photoaddressable polymer (PAP) layer with a thickness as small as 5 nm can be utilized for the monodomain alignment of thermotropic liquid crystalline polyfluorene. The optical anisotropies in absorption and emission are found to be independent of the PAP layer thickness within a range of 5 to 30 nm. On the other hand, decreasing the PAP layer thickness greatly improves the performance of polarized blue light-emitting diodes: With a PAP layer thickness of only 10 nm, the device turns on at 5 V and reaches a brightness of 100 cd/m2 at 8 V with an efficiency of 0.66 cd/A.Keywords
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