Sol-gel synthesis and photoluminescence of CaTi-1-x ZrO-3 : Pr3+ phosphors

摘要

CaTi-1-xZr-xO_3: Pr~3+ phosphors have been synthesized by sol-gel and solid state methods, with x = 1/300, 2/300, 3/300, 4/300, 5/300, 6/300, 7/300, respectively. Powder X-ray diffraction (XRD), UV-visible absorption spectra, photoluminescent spectra (PL), and scanning electron microscopy (SEM) images are used to characterize the powder samples. The inverse absorption at 610 nm appearing in the UV-visible absorption spectra is due to the 'D2~4~3/1_4 characteristic emission of Pr~3+. Changes in the emission spectra at 610 um were agreed with those in UV-visible absorption spectra. The strongest red excitation obtained from Pr~3+ (x = 4/300) and CaTi-1-xZrxO_3: Pr~3+ (x = 5/300) possesses the strongest emission at 610 um, similar to the intensities of Ca(Ti-1-x Zrx)O_3: Pr3+ (x = 3/300, 4/300, 6/300), which may be corresponded to the cell parameters of CaTii_xZr1O_3: Pr~3+.