Design, Modelling and Optimization of Nano-Gratings on PHOLEDs for Visible Light Communication
摘要
The light emission from planar thin film organic light-emitting diode (OLED) structures is impacted by the light’s interference effects. With appropriate design of the phosphorescent organic light-emitting diode (PHOLED) configuration, layer thickness modification and proper use of nanostructures, the optical and electrical characteristics of PHOLEDs can be enhanced, enabling improved optical intensity power, light radiation with proper wavelength, reduced loss and a wider range viewing angles. In this research, a PHOLED is designed and optimized by incorporating host and guest layers along with grating nanostructures at the cathode and substrate layers to address the surface plasmon loss and substrate loss, respectively. The optimized PHOLED device (D5) exhibits red light at 662 nm with enhanced optical intensity of 1.36 × 10−5 V/m and an overall increase in optical performance of about 43.61% compared to the basic PHOLED device (D2) designed in this work. Here, we focus on enhancing the optical intensity output of the PHOLED through the use of phosphorescent materials and highly optimized layer design, along with the use of host and guest layers and nano-gratings. Using finite-difference time-domain simulations, we obtain enhanced optical intensity with lower loss. With this work, the light intensity is enhanced to meet the intensity requirement for lighting and information transmission through light. Future work will focus on its use in visible light communication (VLC).