A new red-emitting phosphor, SrTiO3 : Pr3+, for low-voltage electron excitation

A new red phosphor, SrTiO3:Pr3+, was developed for vacuum fluorescent displ ays (VFDs) and field emission displays (FEDs). It was discovered that the a ddition of Al is essential to achieve a high luminous efficiency of low-vol tage cathodoluminescence and photoluminescence. The mechanism underlying th e improvement of the luminous efficiency by the addition of Al is discussed . With the addition of 17 mol % Al, luminance of 800 cd/m(2) was obtained a t the anode voltage of 50 V. Powder X-ray diffraction and Auger analysis sh owed that the Al ions react with the Sr ions to form SrAl12O19.