Premium
Synthesis of novel Dy 3+ activated Ba 2 CaZn 2 Si 6 O 17 phosphors for white light‐emitting diodes
Author(s) -
Annadurai G.,
Masilla Moses Kennedy S.,
Sivakumar V.
Publication year - 2018
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3441
Subject(s) - phosphor , chromaticity , analytical chemistry (journal) , powder diffraction , ion , materials science , dysprosium , scanning electron microscope , chemistry , optoelectronics , crystallography , optics , physics , inorganic chemistry , organic chemistry , chromatography , composite material
Dysprosium ion (Dy 3+ ) activated Ba 2 CaZn 2 Si 6 O 17 phosphors were synthesized using high temperature solid‐state reaction method. Powder X‐ray diffraction (PXRD) analysis confirmed the phase formation of the as‐prepared phosphors. Scanning electron microscopy (SEM) analysis disclosed an agglomeration of particles with an irregular morphology. Under 350 nm excitation, the emission spectrum of Dy 3+ ions showed bands at 481 nm (blue), 577 nm (yellow) and 674 nm (red). The influence of the Dy 3+ concentration on its emission intensity was investigated. The optimum concentration of Dy 3+ ions in the Ba 2 CaZn 2 Si 6 O 17 :Dy 3+ phosphors were found to be x = 0.06. The critical energy transfer distance was calculated. The fluorescence lifetime was also determined for Ba 2 CaZn 2 Si 6 O 17 :0.06Dy 3+ . The Commission International deI’Eclairage (CIE) chromaticity coordinates of the phosphor were calculated to be x = 0.304, y = 0.382. The activation energy for the thermal quenching was calculated to be 0.168 eV. These results indicated that the Ba 2 CaZn 2 Si 6 O 17 :Dy 3+ phosphor might be a potential candidate for near ultraviolet (NUV)‐based white light‐emitting diodes.