Highly efficient $p-i-n$ white organic light emitting devices with tandem structure Available to Purchase

Highly efficient tandem $p-i-n$ white organic light emitting devices have been fabricated. Utilizing an optical transparent bilayer with doped organic $p-n$ junction that consists of 4,7-diphenyl-1,10-phenanthroline: 2% cesium carbonate $(Cs2CO3)∕N,N′$-bis(1-naphthyl)-$N,N′$-diphenyl-$1,1′$-biphenyl-$4,4′$-diamine: 50% v/v tungsten oxide $(WO3)$ as the connecting layer, the tandem $p-i-n$ white device achieved an electroluminescence efficiency of $23.9cd∕A$ and a power efficiency of $7.8lm∕W$ at $20mA∕cm2$ with a Commission Internationale de l’Eclairage coordinates of (0.30, 0.43). The electroluminescent color of this tandem $p-i-n$ white organic light-emitting diode device will not change significantly with respect to drive current variation and forward viewing angle.