Journal article
Improved outcoupling of light in organic light-emitting devices, utilizing a holographic DFB-structure



Publication Details
Authors:
Reinke, N.; Fuhrmann, T.; Perschke, A.; Franke, H.
Publication year:
2004
Journal:
Journal of Luminescence
Pages range:
413-417
Volume number:
110
ISSN:
0022-2313

Abstract
In this work organic light emitting devices (OLEDs) were fabricated implementing gratings, in order to extract waveguided electroluminescence (EL). The gratings were recorded by exposing thin films of the molecular azo glass N,N0-bis (4-phenyl)-N, N0-bis [(4-phenylazo)-phenyl] benzidine (AZOPD) to holographic light patterns. The photopatterned AZOPD serves as hole transport material for devices with aluminum-tris(8-hydroxyquinoline) doped with 1% of 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (Alq3:DCM) as emissive/electrontransport layer. The corrugated devices showed enhanced emission in the forward direction. The emitted light is polarized preferably parallel to the grating lines. In addition, we have found a doubling in the total luminance with respect to the unstructured device.

Last updated on 2019-01-11 at 16:04