The structure of β-SiAlON is derived from β-Si₃N₄ by equivalent substitution of Al-O for Si-N, and its chemical composition can be written as Si_6-zAl_zO_zN_8-z (z represents the number of Al-O pairs substituting for Si-N pairs and 0 ＜ z ≤ 4.2). β-SiAlON has a hexagonal crystal structure and the P6₃ space group. In this structure there are continuous channels parallel to the c direction. During the last few decades SiAlON ceramics have drawn much attention since they can be sintered to full density with with low amounts of glassy phase, resulting in good mechanical properties even at high temperature. Recently optical properties have also been studied. It was observed that SiAlONs doped with 3d or 4f transition elements can be used as pigments or as luminescent materials. The luminescence wavelength of an ion in a matrix is strongly influenced by the anion neighbors of the ion.

A green-emitting oxynitride phosphor powder β-SiAlON:Eu²⁺ with composition of Eu_0.013Si_5.769Al_0.231O_0.205N_7.795 was prepared from aEuO-bSi₃N₄-cAlN system using a by gas pressure sintering method. The powder mixture was synthesized at 1900 ℃ for 2 hrs in 0.9 MPa N₂ atmosphere. The prepared phosphor powder exhibits a hexagonally shaped morphology with the length of ≈ 4㎛ and the diameter of ≈ 0.5㎛. The crystallinity, surface morphology and chemical composition were presented. And moreover, not only photoluminescence (PL) properties were investigated but also quantum efficiencies and absorption were made an inventory of prepared β-SiAlON:Eu²⁺ phosphor powders in a wavelength range from 300 to 600 nm. It can be exited efficiently over a broad spectral range between 255 and 520 nm, and has an emission peak at 540 nm with a full width at half maximum below 55 nm. It has a superior color chromaticity of x = 0.32 and y = 0.64. The internal and external quantum efficiencies of phosphor is 64 % and 52 % at λ_ex = 303nm, respectively.

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1. Synthesis and luminescent properties of Ca-α-SiAlON:Eu²⁺ phosphors
2. Luminescence and temperature dependency of β-SiAlON phosphor
3. Synthesis of SiAlON-type Phosphors and Their Photoluminescence Property