Photo-luminescence study of red borate phosphor Sr 3 Y 1-x (BO 3 ) 3 :xEu 3+

Abstract

The polycrystalline powder sample of Eu 3+ activated strontium yttrium borate phosphor Sr 3 Y 1-x (BO 3 ) 3 :xEu 3+ (x=0.03) was prepared by solution combustion technique. A prepared material was characterized by powder XRD, SEM, PL and FT-IR techniques. Powder XRD confirms the Formation of desired phosphor and its crystal structure. XRD pattern of synthesized phosphor matches with standard pattern given by ICSD File NO. 246230. Particle morphology was studied using SEM. Microstructure of the phosphor consisted of irregular grains with agglomerate phenomena. The average size of synthesized phosphor particles is about 5-10 μm. FTIR confirms the complete removal of nitrates, organic matter and confirms the existence of the [BO 3 ]- groups. A broad excitation band in the wavelength range 200- 300 nm centering at 254nm is observed, which can be due to the charge transfer from O -2 to Eu 3+ . At 254 nm Photo Luminescence excitation of sample shows intense red emission at 613nm corresponding to 5 D 1 → 7 F 2 transition of Eu 3+ . Intense emission at 613nm is due to electric dipole transition. Low intensity emission due magnetic dipole transition at 595 nm (5 D 1 → 7 F 1 of Eu 3+ ) and at 580 nm ( 5 D 1 → 7 F 0 of Eu 3+ ) was also noted. Chromaticity coordinates of sample was found to be X=0.674719511, Y=0.325095182, which fall into the red region in the CIE 1931 chromaticity diagram. The Phosphor exhibits intense red emission at 613 nm hence it could be a potential red emitting component in the tricolor lamps and may be used in white light emitting diodes for practical use.