Highly efficient and stable white light organic light-emitting devices

Abstract

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 17.1cd∕A and 7.9lm∕W at 20mA∕cm2. From 112 to 32 010 nits, the CIEx,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 t1∕2 lifetime over 40000h at an initial luminance of 300cd∕m2. This result is among the best records of fluorescent white light OLEDs.