Organic electroluminescent diodes (OLEDs) have promising applications in display and lighting due to their high efficiency, ultra-thinness, easy bending, and eye protection. However, charge transport imbalance constrains the further improvement of OLED device performance. In this study, the effects of different co-mingled body ratios on the charge transport mechanism of TADF blue materials were investigated using quantum computational methods to enhance the charge transport and luminescence efficiency of white organic light-emitting diodes (WOLEDs). Through the design of ITO/HAT – CN/HATCN/TAPC/DBA – DI: TCTA: 26 dczppy/Tm3PyP26PyB/Liq/Al structure device, system control TCTA: the proportion of 26 dczppy (1-0, 2:1, 1:1, 1:2, 1-0), the influence of the proportion of the blending main body on the carrier equilibrium was studied. The experimental results show that when the ratio of TCTA:26DCzPPy is 1:1, the device performance is optimized, with a maximum brightness of 11,072 cd/m², a maximum external quantum efficiency (EQE) of 22.56%, and a carrier equilibrium factor γ as high as 0.927, which is significantly better than that of devices with other ratios. Single-carrier device studies have shown that an appropriate ratio of the co-mingled body can simultaneously improve the electron and hole transport ability, optimize the carrier injection path, and promote the balanced distribution of carriers in the luminescent layer. It is shown that charge transport can be effectively balanced by regulating the co-mingled body ratio, which provides a theoretical basis and experimental foundation for the design of high-efficiency WOLED devices.
