66.4: <i>Invited Paper</i> : High‐Quality White OLEDs and Resource Saving Fabrication Processes for Lighting Application

Abstract

Abstract White OLEDs with high efficiency (over 30 lm/W) and high quality emission characteristics (e.g., CRI of over 90, very small variation of chromaticity in different directions and chromaticity just on the black‐body radiation curve) applicable to “Lighting” were realized by a two‐unit structure with a fluorescent deep blue emissive unit and a phosphorescent green and red emissive unit. A new deposition source with a hot‐wall and a rate controllable valve was developed. Thickness uniformity within +/− 3% at high deposition rate of over 8 nm/s, high material utilization of over 70 %, and repeatable deposition rate controllability were confirmed.