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Enhanced luminescence and white light emission from Eu 3+ ‐co‐doped K 3 Ca 2 (SO 4 ) 3 Cl:Dy 3+ phosphor with near visible ultraviolet excitation for white LEDs
Author(s) -
Baig N.,
Dhoble N. S.,
Park K.,
Kokode N. S.,
Dhoble S. J.
Publication year - 2015
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.2763
Subject(s) - chromaticity , phosphor , analytical chemistry (journal) , doping , luminescence , europium , photoluminescence , dysprosium , ion , materials science , emission spectrum , chemistry , optics , inorganic chemistry , optoelectronics , spectral line , physics , organic chemistry , astronomy , chromatography
The luminescent properties of europium (Eu)‐ and dysprosium (Dy)‐co‐doped K 3 Ca 2 (SO 4 ) 3 Cl halosulfate phosphors were analyzed. This paper reports the photoluminescence (PL) properties of K 3 Ca 2 (SO 4 ) 3 Cl microphosphor doped with Eu and Dy and synthesized using a cost‐effective wet chemical method. The phosphors were characterized by X‐ray diffraction and scanning electron microscopy. The CIE coordinates were calculated to display the color of the phosphor. PL emission of the prepared samples show peaks at 484 nm (blue), 575 nm (yellow), 594 nm (orange) and 617 nm (red). The emission color of the Eu,Dy‐co‐doped K 3 Ca 2 (SO 4 ) 3 Cl halophosphor depends on the doping concentration and excitation wavelength. The addition of Eu in K 3 Ca 2 (SO 4 ) 3 Cl:Dy greatly enhances the intensity of the blue and yellow peaks, which corresponds to the 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 13/2 transitions of Dy 3+ ions (under 351 nm excitation). The Eu 3+ /Dy 3+ co‐doping also produces white light emission for 1 mol% of Eu 3+ , 1 mol% of Dy 3+ in the K 3 Ca 2 (SO 4 ) 3 Cl lattice under 396 nm excitation, for which the calculated chromaticity coordinates are (0.35, 0.31). Thus, K 3 Ca 2 (SO 4 ) 3 Cl co‐doped with Eu/Dy is a suitable candidate for NUV based white light‐emitting phosphors technology. Copyright © 2014 John Wiley & Sons, Ltd.