A full visible LED enabled by a broadband yellow emission nepheline phosphor derived from a europium doped SOD zeolite

Developing a broadband yellow emission phosphor that covers green to orange light regions is an effective way to achieve high-quality solid-state lighting. A broadband yellow phosphor with excellent thermal stability was obtained by heating a europium-doped SOD zeolite under a reducing atmosphere. Under UV excitation, the phosphor exhibits a broad emission band (FWHM = 120 nm) and high thermal stability (80% intensity at 423 K). Prototype white LEDs using this broadband yellow-emit phosphor, a blue-emit phosphor (NaMgBO3:Ce3+), and a red-emit phosphor (Sr2Si5N8:Eu2+) show excellent color quality (CRI = 93, R10 = 88) and a low correlated color temperature (CCT = 4219 K), outperforming most of the tricolor phosphor-converted NUV-LEDs. This work highlights the great potential of lanthanide-doped zeolites in developing promising phosphors for high quality lighting.

Automated summary

This study successfully developed a broadband yellow phosphor with excellent thermal stability by heating a europium-doped SOD zeolite under a reducing atmosphere. The phosphor exhibited a broad emission band and high thermal stability under UV excitation. Prototype white LEDs using this phosphor, along with other phosphors, demonstrated excellent color quality and low correlated color temperature, outperforming most tricolor NUV-LEDs.