Isomorphism of Sr[LiAlO] and Sr[LiGaO] - Syntheses, Crystal Structure, and Europium(II) Luminescence.

While highly efficient red-emitting inorganic phosphors have been discovered in the substance class of alkaline earth oxo(nitrido)lithoaluminates, new narrow-band green- and yellow-emitting components are being sought to improve the performance of phosphor-converted light-emitting diodes (pc-LEDs). Various solid-state reactions were carried out under protective gas atmosphere in nickel crucibles and sealed tantalum ampules to synthesize Sr[LiAlO], Sr[LiGaO], and five substitutional derivates of Sr[Li(Al Ga )O] at moderate temperatures. The observation of a linear increase in the unit cell parameters as a function of the increasing gallium mole fraction in Sr[Li(Al Ga )O] revealed Vegard behavior in the solid-solution series, which was derived from powder X-ray diffraction data.