| 초록 |
Highly efficient OLEDs will be presented using various exciplex forming co-hosts and phosphorescent and fluorescent dyes possessing horizontally oriented emission dipoles and high photoluminescence quantum yield (PLQYs), including blue (EQE of 30%), green (EQE of 32% ), orange (EQE of 32%) and red (EQE of 36%), white (EQE of 28.8%) and fluorescent green (EQE of 30%) OLEDs. The theoretical prediction based on the classical dipole model agrees very well with the experimental data, validating the optical model used for the prediction of the EQEs. Based on the validation, we offer a universal plot of maximum efficiency of OLEDs achievable with different values of PLQY and orientation of TDM without fabricating devices. The optical analysis indicates that OLEDs with EQE higher than 40% can be realized without any extra light extraction layers, if phosphorescent dyes with PLQY and horizontal portion of emission dipoles over 95% are used. |
