Combustion Synthesis and Amalgamating anionic exchange at KNaSO 4 phosphor activated with Eu 3+ , Dy 3+ and Sm 3+ rare earth ions to enhance w‐LED performance

In present work, KNa (SO4 ) phosphor doped with different concentration of rare earth Eu3+ , Sm3+ and Dy3+ ion (0.05, 0.1, 0.3, 0.5, 0.7, 1mole%) was synthesized by solid state diffusion technique.. The Photoluminescence investigations were carried out for entire Eu3+ , Sm3+ and Dy3+ doped phosphors and he rare earth ions retaining maximum PL intensity was selected for advance anionic exchange. In present investigation the phosphors KNa (SO4 ):Eu3+ (1mole%), KNa (SO4 ):Dy3+v (0.5 mole%) and KNa (SO4 ):Sm3+ (0.3mole%) assigned utmost PL intensity,therefore selected for further anionic substitution of sulphate anions by different concentration of vanadate, phosphate, and tungstate anions such as KNa (SO4 )1-x (MO4 )x : W (where W = Eu3+ 1mole%, Dy3+ 0.5mole% and Sm3+ 0.3mole%, MO4 = PO4, VO4, WO4 and x = 0.1, 0.3, 0.5, 0.7, 1). Moreover structural and molecular environment of the substituted phosphors were characterized by X- Ray Diffraction and FTIR individually. The in depth Morphological investigations of the prepared phosphor was deliberated by scanning electron microscopy (SEM). For principal investigation on enhancement of w-LED performance the photoluminescence (PL) properties of the entire synthesized phosphors were studied analytically. Emission intensity ratio for KNa (SO4 ):Eu3+ 1mole% , KNa (SO4 )0 (PO4 )1 :Eu 1mol%, KNa (SO4 )0.9 (VO4 )1 :Eu 1mole%, KNa (SO4 )0.9 (WO4 )0.1 :Eu 1mole% was found to be 1:1.15:1.23:0.08.PL intensity ratio for the phosphors KNaSO4 :Dy 0.5 mole%, K Na (SO4 )0.9 (PO4 )0.1:Dy 0.5mole% was found to be 1:2, while ratio of PL intensity was observed as 1:3.2:0.8 for KNa (SO4 ) Sm 1mole%, KNa (SO4 )0.5 (PO4)0.5 :Sm 0.3mole% and K Na (SO4 )0.7 (VO4 )0.3 :Sm 0.3 mole% phosphors respectively. The chromatic investigations were carried out by CIE color co-ordinate diagram, which suggested that the prepared Eu3+ doped and Sm3+ doped phosphors are prospective contestants for red and green light-emitting diodes (LEDs) correspondingly, whereas Dy3+ doped phosphors showed emission at blue and yellow regions. The entire study reveals that the indicating that amalgamating anionic exchange at KNaSO4 phosphor activated with Eu3+ , Dy3+ and Sm3+ rare earth ions can generate and enhance white light emission.