Phosphorescent OLEDs: Sky‐Blue Phosphorescent OLEDs with 34.1% External Quantum Efficiency Using a Low Refractive Index Electron Transporting Layer (Adv. Mater. 24/2016)
1. Department of Materials Science and Engineering, Seoul National University, Seoul, South Korea;2. Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, South Korea