White-light Organic Light-Emitting Diodes （WOLEDs） have attracted extensive attention in the field of solid-state lighting and display due to their thinness， flexibility， and surface light source characteristics. However， WOLEDs still face challenges such as insufficient lifetime， color coordinate drift， and low power efficiency. To address these challenges， this study constructed a composite structure of blue-light OLED exciting yellow and red dual-color phosphor film. By full-spectrum matching to screen phosphors and optimizing the spectral characteristics of the phosphor film， a white-light device with a high Color Rendering Index （CRI） of 92.5 was successfully realized. By introducing SiO₂ nanospheres as a dispersion medium and scattering medium， on the one hand， the aggregation of phosphors inducing Förster resonance energy transfer （FRET） effect was effectively suppressed， and on the other hand， the out-coupling efficiency of blue-light OLED was improved， increasing the device power efficiency from 47 lm/W to 58 lm/W， with a relative increase of 23%. This scheme combines the traditional advantages of OLED with the excellent stability of phosphors， simplifies the process flow， and significantly reduces production costs. Experiments show that the color coordinate shift （ΔCIE） of the device is less than 0.008 in the voltage range of 4-10 V， and it shows great application potential in high-end scenarios such as museum lighting and medical surgical lamps. This study provides a scalable technological paradigm for the industrialization of new-generation WOLEDs and has practical application value for promoting the development of healthy lighting and flexible display technologies.

white light;organic light emitting diode;color coordinates;phosphor