High - performance phosphorescent white - stacked organic light - emitting devices for solid - state lighting

摘要

In this work we report exceptional efficacy, lifetime and color stability for all - phosphorescent white stacked organic light - emitting devices (SOLED?s). We report data for all-phosphorescent white SOLED pixels with two emissive units connected in series by a charge generation layer (CGL). At 3, 000 cd/m2, efficacy = 54 to 56 lm/W and lifetime to 70% of initial luminance LT70 ≈ 20, 000 h, with color rendering index (CRI) = 82 to 83 and chromaticity meeting Energy Star criteria. We further report data for a 15 cm x 15 cm white SOLED panel that operates at 3,000 cd/m2 with 48 Im/W efficacy, CRI = 86 and chromaticity meeting Energy Star criteria. The panel has extremely low operating temperature that is only 6.4°C above ambient, and exceptional lifetime of LT70 ≈ 13,000 h when operated at 3, 000 cd/m2.