Crystal and electronic structures, luminescence properties of Eu2+-doped Si6−zAlzOzN8−z and MySi6−zAlz−yOz+yN8−z−y (M=2Li, Mg, Ca, Sr, Ba)

The z value dependence of photoluminescence in Eu2+-doped β-SiAlON (Si6−zAlzOzN8−z) with 1≤z≤4

“…This suggests that Eu 3+ ions in the Eu 2 O 3 raw material is reduced to Eu 2+ ions in the -SiAlON products in a reducing nitrogen atmosphere, similar to the previous reports [8,[11][12][13][14]. The reduction may be due to the reaction 6Eu 3+ + 2N 3- 6Eu 2+ + N 2 , as proposed by de Graaf [18].…”

“…It has continuous channels to accommodate for Eu 2+ ions, as confirmed by STEM without any detailed crystallographic information [15]. By modeling analysis, Li et al [14] showed that the Eu 2+ ion occupies the 2b site (0,0,0) in the channels and coordinates to six (N/O) atoms. They also suggested the general formula Eu x Si 6-z Al z-x O z+x N 8-z-x for the Eu 2+ -doped -SiAlON.…”

Controlling of Structural Ordering and Rigidity of β-SiAlON:Eu through Chemical Cosubstitution to Approach Narrow-Band-Emission for Light-Emitting Diodes Application

“…Based on this, many efforts are devoted to the study of β-SiAlON:Eu. [17][18][19][20][21][22][23][24] When z is decreased, the emission peak wavelength exhibits a blue-shift, and the FWHM decreases. Also the thermal quenching resistance of β-SiAlON:Eu phosphor enhances and obvious sharp lines on emission band appears with the decrease of z.…”

Incorporation of the transition metals (Cr and Fe) into β-SiAlON crystal structure

“…On the contrary, this view has been changing with recent studies revealing that some of the rare earth elements such as Eu 2+ and Ce 3+ can be accommodated into the b-SiAlON [6][7][8]. Furthermore, alkali and alkaline earth ions, e.g., Li + , Mg 2+ and Ca 2+ have been shown to be incorporated into the host lattice of b-SiAlON [9].…”