Influence of the Strong Green-Emission Phosphor SrLaAlO4: Yb/Er@SiO2 on the Illumination of Solid-State White Light-emitting Didoes

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 green-emission SLA: Yb/Er@SiO₂ compound can be a competitive material for the development of solid-state lighting.

Color uniformity; Lumen output; SrLaAlO4; Upconversion phosphor; White LED; Yb/Er@SiO2

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