Adjusting White OLEDs with Yellow Light Emission Phosphor Dye and Ultrathin NPB Layer Structure

Figure 1

Device structure of organic devices and energy level diagram of relevant materials used in this study. The doping concentration of (t-bt)₂Ir(acac) was 𝑥 wt% and ultrathin layer was 𝑦 layer (1 nm), 𝑥=3 for device A and B, 𝑥=5 for device C and D, 𝑦 = CPB : NPB (1 : 1) for device A and C, and 𝑦 = NPB for device B and D.

(a)

(b)