Fuchs C, Schwab T, Roch T, Eckardt S, Lasagni A, Hofmann S, Lüssem B, Müller-Meskamp L, Leo K, Gather M C, Scholz R
Institut für Angewandte Photophysik, Technische Universität Dresden, George-Bähr-Straße 1, 01069 Dresden,
Opt Express. 2013 Jul 15;21(14):16319-30. doi: 10.1364/OE.21.016319.
Bragg scattering effects in bottom-emitting organic light-emitting diodes (OLEDs) grown on corrugated aluminum-doped zinc oxide electrodes are analyzed. Periodic corrugation is introduced by structuring the oxide electrode via UV laser ablation, a process that enables flexible adjustment of the period and height of corrugation. We demonstrate that fabrication of stable and electrically efficient OLEDs on these rough substrates is feasible. Sharp spectral features are superimposed onto the broad emission spectra of the OLEDs, providing clear evidence for Bragg scattering of light from guided modes into the air cone. Theoretical analysis based on an emissive dipole model and conservation of momentum considerations allows a quantitative description of scattering and the associated dispersion relations.
分析了在波纹状铝掺杂氧化锌电极上生长的底部发射有机发光二极管（OLED）中的布拉格散射效应。通过紫外激光烧蚀对氧化物电极进行结构化处理引入周期性波纹，该过程能够灵活调整波纹的周期和高度。我们证明了在这些粗糙衬底上制造稳定且电效率高的OLED是可行的。尖锐的光谱特征叠加在OLED的宽发射光谱上，为光从导模散射到空气锥中提供了明确证据。基于发射偶极子模型和动量守恒考虑的理论分析允许对散射及相关色散关系进行定量描述。
