“…For instance, orthorhombic YAP crystals doped with rare-earth ions are potential candidates of better laser materials than Y 3 Al 5 O 12 (YAG) crystal and sparklers for radiation detection, as well as other applications [9][10][11][12]; cubic YAP crystals with perovskite structure are used for preparing transparent ceramics thin film with better transparency in a wide spectral range, high heat conductivity and hardness [1,13], also used as electrolyte for solid oxide fuel cells [2]. Many groups reported their research works and presented significant information about electronic structures [8,10,14], electrical conductivity [2,15], absorption spectra [3,[16][17][18], color centers [5,16,17], energy transfer [18,19], luminescence [5,6,[19][20][21], electron paramagnetic resonance [22], thermal diffusivity [7]. etc.…”