Electroluminescence of Ti- and Ca-doped YAlO3 crystals in the visible region

The electroluminescence (EL) of perovskite-type YAlO3 single crystal thin slabs doped with Ti and Ca was investigated. The thin slabs were prepared from rod-shaped single crystals grown in a reducing atmosphere by the floating-zone method. Samples of 0.1% Ti-doped YAlO3, 1% Ti-doped YAlO3 and 0.1% Ca-doped YAlO3, on which Au and Al electrodes were deposited, showed green EL when electric fields greater than ± 1 × 106 V/m were applied, with drive frequencies between 0.2 Hz and 1 kHz and a bipolar symmetrical drive waveform. The strongest EL band with narrow widths (FWHM = 3–4 nm) appeared at the same peak wavelength (546 nm) for all three samples. This gives rise to possible uses of Ti- and Ca-doped YAlO3 crystals in EL devices that emit monochromatic green light.