Publication

Abstract : Single crystals of Lanthanum oxalate [La 2 (C 2 O 4 ) 3 ]1OH 2 O and Dy ³⁺ doped Lanthanum oxalate [La 2-x Dy x (C 2 O 4 ) 3 ]10H 2 O with x=0.1, 0.15, 0.2 were grown by gel method and characterised by X-ray powder diffraction analysis. Thermal stability of sample was investigated by thermo gravimetric analysis. UV-Visible absorption and photo-luminescent studies were also conducted. The emission spectrum on exciting at 271nm and 364 nm were recorded in which Dy ³⁺ ions showed four emission bands at positions 458nm (blue), 478 nm (blue), 572 nm (yellow) and 655 nm (red) corresponding to transitions ⁴ I 15/2 → ⁶ H 15/2 , ⁴ F 9/2 → ⁶ H 15/2 , ⁴ F 9/2 → ⁶ H 13/2 and ⁴ F 9/2 → ⁶ H 11/2 respectively. The CIE coordinates, colour purity and CCT values were calculated, and all these parameters show that Dy ³⁺ doped lanthanum oxalate single crystals are suitable candidates for white light emitting applications.