Light-emitting devices based on organometallic platinum complexes as emitters (original) (raw)

High Efficiency Very Low Color Temperature Phosphorescent Organic Light Emitting Diodes

Color temperature of light plays an important role in human physiology and psychology as low color temperature illumination source shows mild effect on melatonin suppression. We presents an energy efficient very low color temperature (CT) organic light emitting diodes using a phosphorescent orange emitter tris(2-phenylquinoline) iridium(III). The device exhibits a high power efficiency of 44.3 and ~32 lm/W at 100 and 1,000 cd/m2, respectively. The device also reveals a very low color temperature, ~1,745 K, with 19.2% external quantum efficiency and (0.571, 0.424) Commission International de L'Eclairage (CIE) coordinates at 1,000 cd/m2. The high efficiency may be attributed to good energy transfer between host and guest materials, and balanced carrier injection.