Hole injection material, namely, 1-PNA-BPBPOX, were adapted to white OLED devices for solution process. White devices were fabricated using a multilayer emission structure, consisting of a single host layer. The red phosphorescent, (Ir(piq)₃), and the blue phosphorescent, (FIrpic), are doped into separate layers of (mCP) host. The FIrpic and Ir(piq)₃ guest molecules are directly excited by direct recombination on these molecules. When the device with BPBPOX was compared to the device with PEDOT:PSS, a commercialized solution HIL material, the luminance efficiency was 6.37 cd/A for BPBPOX and 0.66 cd/A for PEDOT:PSS for the optimized white device structure, showing 10 times as high efficiency.