The Yb3+/Er3+ co-doped SrLaAlO4(SLA: Yb3+/Er3+) phosphor is a potential upconversion luminescent material with strong green emission for high-power white light-emitting diodes (LEDs). This work used the SLA: Yb3+/Er3+ phosphor for the white LED by blending it with yellow phosphor and SiO2 particles, which is called the SLA: Yb/Er@SiO2 mixture. The SLA: Yb3+/Er3+ phosphor was created with a steady Er3+ ion concentration of 2 mol%, while that of the Yb3+ was adjusted in 1-7 mol%. Under the infrared laser excitation (980 nm), the collected data on luminescence measurement shows that the SLA: Yb3+/Er3+ exhibited both upconversion green and red-color emissions in its luminescence band. Moreover, with 4 mol% of Yb3+, the highest green-emission intensity was observed. A fabricated white LED comprising SLA: Yb/Er@SiO2 compound placed on the blue LED chip was examined with different SiO2 amounts. The obtained data showed an increase in the green luminescence power and lumen output of the white LED with increasing SiO2 concentration. The presence of SLA: Yb/Er@SiO2 helped reduce the color deviation for enhanced color uniformity. Thus, this reenemission SLA: Yb/Er@SiO2 compound can be a competitive material for the development of solid-state lighting.