Characterization and properties of green-emitting β-SiAlON:Eu2+ powder phosphors for white light-emitting diodes

TLDR

The study reports a β‑SiAlON:Eu²⁺ green phosphor with composition Eu₀.₀₀₂⁹₆Si₀.₄₁₃⁹₅Al₀.₀₁₃₃₄O₀.₀₀₄₄N₀.₅₆₅₂₈. The phosphor powder has a rod‑like morphology (~4 µm long, ~0.5 µm diameter), is efficiently excited from 280 to 480 nm, emits green light at 535 nm (FWHM 55 nm) with chromaticity coordinates x = 0.32, y = 0.64, achieves internal and external quantum efficiencies of 70 % and 61 % at 303 nm, and shows promise for phosphor‑converted white LEDs.

Abstract

This letter reports a β-SiAlON:Eu2+ green phosphor with the composition of Eu0.00296Si0.41395Al0.01334O0.0044N0.56528. The phosphor powder exhibits a rod-like morphology with the length of ∼4μm and the diameter of ∼0.5μm. It can be excited efficiently over a broad spectral range between 280 and 480 nm, and has an emission peak at 535 nm with a full width at half maximum of 55 nm. It has a superior color chromaticity of x=0.32 and y=0.64. The internal and external quantum efficiencies of this phosphor is 70% and 61% at λex=303nm, respectively. This newly developed green phosphor has potential applications in phosphor-converted white LEDs.