Fig. 1. Modes in asymmetric slab waveguide

Fig. 2. Schematic diagram of OLED device configuration

Fig. 3. Reflectances of Ag and Al films with different thicknesses varying with wavelength

Fig. 4. Structural diagram of the electroluminescence spectrum collection system

Fig. 5. Radiation spectra when NPB thickness is in the range of 45~300 nm

Fig. 6. Polarization characteristics of lateral radiation spectrum of the OLED substrate

Fig. 7. Lateral emission spectra from OLED when the NPB thickness is in the range of 45−300 nm