Highly efficient and stable white light organic light-emitting devices

A highly efficient two-element white light organic light-emitting device with a sky blue dopant BUBD-1 and a yellow dopant TBRb was fabricated. The device achieved an electroluminescence efficiency of 17.1 cd ∕ A and 7.9 lm ∕ W at 20 mA ∕ cm 2 . From 112 to 32010 nits, the CIE x , y coordinates variation was Δ ( x , y ) < ± ( 0.01 , 0.01 ) , which is superior to common white light organic light-emitting devices (OLEDs) that tend to change color with drive conditions. Moreover, the device reached a half-decay t 1 ∕ 2 lifetime over 40 000 h at an initial luminance of 300 cd ∕ m 2 . This result is among the best records of fluorescent white light OLEDs.