High-efficiency, solution-processed, multilayer phosphorescent organic light-emitting diodes with a copper thiocyanate hole-injection/hole-transport layer

Abstract

(Graph Presented). Copper thiocyanate (CuSCN) is introduced as a holeinjection/ holetransport layer (HIL/HTL) for solutionprocessed organic lightemitting diodes (OLEDs). The OLED devices reported here with CuSCN as HIL/HTL perform significantly better than equivalent devices fabricated with a PEDOT:PSS HIL/HTL, and solutionprocessed, phosphorescent, smallmolecule, green OLEDs with maximum luminance ≥10 000 cd m-2, maximum luminous efficiency ≤50 cd A-1, and maximum luminous power efficiency ≤55 lm W-1 are demonstrated.