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8354917 
Journal Article 
A novel yellowish white Dy3+ activated alpha-Al2O3 phosphor: Photoluminescence and optical studies 
Kumar, S; Prakash, Ram; Kumar, V; , 
2015 
Yes 
Functional Materials Letters
ISSN: 1793-6047 
WORLD SCIENTIFIC PUBL CO PTE LTD 
SINGAPORE 
1550061 
WOS:000362450500015 
Trivalent Dy doped alpha-Al2O3 phosphor was synthesized by low temperature solution combustion method using urea as fuel. The phosphor was well characterized by X-ray diffraction (XRD), photoluminescence (PL) spectroscopy and diffused reflectance spectroscopy (DRS). XRD study confirmed the hexagonal structure of Dy3+ doped alpha-Al2O3 as prepared phosphor. Under various ultraviolet (UV) excitations (353 nm, 367 nm and 325 nm), alpha-Al2O3: Dy3+ phosphor exhibits the characteristic emission bands centered at 490 nm, 589 nm and 670 nm, resulting from the F-4(9/2)-H-6(J/2) (J = 15, 13, 11) transitions of Dy3+, respectively. The observed CIE coordinates (x, y) as (0.373, 0.379) corresponds to the shade of yellowish white in color gamut. The bandgap was calculated using diffused reflectance (DR) spectrum and it was estimated around 5.9 eV.