The Effect Of Al Inclusion On The Photoluminescence Of Lasi3n5:Ce3+ Phosphors

Blue emitting LaSi3N5:Ce3+ phosphors, the structure of which is orthorhombic with P2(1)2(1)2(1) symmetry, could enhance the color rendering index of white light emitting diodes (WLED). However, it is tricky to achieve the crystallization of single phase LaSi3N5:Ce3+ by the conventional gas pressurized sintering, and the excitation efficiency is unsatisfactory in the wavelength range that most of WLED applications adopted to pump phosphors. To attain LaSi3N5:Ce3+-based single phase phosphors and to shift the excitation band towards desirable wavelength region, Aluminum was introduced into LaSi3N5:Ce3+, so that single phase LaSi3-3x/4AlxN5:Ce3+ or LaSi3-yAlyN5-yOy:Ce3+ solid solutions was obtained with a well-defined P2(1)2(1)2(1) symmetry maintained.