MIXED COLOR EMISSION FROM EUROPIUM CO–DOPED La2O3:Bi3+ NANOPHOSPHORS MATERIAL BY POLYOL METHOD

P.V.S.S.S.N.Reddy; K.Sujatha; Ch.Satya Kamal; T.Samuel; M.Indiradevi; K.Ramachandra Rao

Volume : V, Issue : II, February - 2016

MIXED COLOR EMISSION FROM EUROPIUM CO–DOPED La2O3:Bi3+ NANOPHOSPHORS MATERIAL BY POLYOL METHOD

P. V. S. S. S. N. Reddy, K. Sujatha, Ch. Satya Kamal, T. Samuel, M. Indiradevi, K. Ramachandra Rao

Abstract :

<p>&nbsp;Photoluminescence (PL) was observed from prepared Bi3+ and europium (Eu3+) co&ndash;doped La2O3 (La2O3: Bi, Eu) nanophosphor powder. The phosphor powders were prepared by polyol method using ethylene glycol as capping agent. The phase formation, functional groups identification of as prepared samples and morphological studies were confirmed by XRD, FTIR and scanning electron microscopy (SEM) and transmission electron microscopy (TEM). PL emission widely changed from green&ndash;orange region to approximately blue on heating La2O3:Bi3+, Eu3+ phosphor powders from 700 to 900 o C. The observed emission peaks in PL from phosphor powder materials were assigned to either the oad emission originating from the transition in Bi3+ or the visible emission peaks originating transition from the europium ion. Emission peaks of PL are plotted using CIE coordinates.</p>