Light sources with low color temperature (CT) are essential for their markedly
less suppression effect on the secretion of melatonin, and high power efficiency is crucial
for energy-saving. To provide visual comfort, the light source should also have a
reasonably high color rendering index (CRI). In this report, we demonstrate the design
and fabrication of low CT and high efficiency organic light-emitting diodes. The best
resultant device exhibits a CT of 1,880 K, much lower than that of incandescent bulbs
(2,000-2,500 K) and even as low as that of candles, (1,800-2,000 K), a beyond theoretical
limit external quantum efficiency 22.7 %, and 36.0 lm/W at 100 cd/m 2. The high
efficiency of the proposed device may be attributed to its interlayer, which helps
effectively distribute the entering carriers into the available recombination zones.
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