Crystal structure and luminescence of Sr0.99Eu0.01AlSiN3

Strontium europium aluminum silicon nitride, Sr0.99Eu0.01AlSiN3, was synthesized by heating a mixture of binary nitrides at 2173 K and a N2 gas pressure of 190 MPa. Single crystals of Sr0.99Eu0.01AlSiN3 approximately 30 μm were obtained. The structure was confirmed to be an isotypic structure of CaAlSiN3 in the orthorhombic space group Cmc21, analyzed by single-crystal X-ray diffraction. The lattice parameters are a=9.843(3), b=5.7603(16), c=5.177(2) Å, cell volume=293.53(17) Å3. It shows an orange-red photoluminescence by 5d→4f transition of Eu2+ at around 610 nm under excitation ranging from ultraviolet to 525 nm. The photoluminescence intensity, temperature characteristics, and oxidative stability were comparable or superior to those of CaAlSiN3:Eu2+ phosphor.

The complete substitution of Ca2+ with Sr2+ in CaAlSiN3:Eu2+ red-emitting phosphor was performed by synthesis at high N2 gas pressure, analyzed the crystal structure by single-crystal X-ray diffraction, and characterized the photoluminescent properties. The substitution resulted in 4% cell volume increase and 40 nm blue shift of the emission peak, maintaining superior temperature characteristics and oxidative stability.Figure optionsDownload as PowerPoint slide