Swift heavy ion induced structural, optical and luminescence modification in NaSrBO3:Dy3+ phosphor

• Published in: Journal of materials science Vol. 49; no. 18; pp. 6404 - 6412
• Main Authors: Bedyal, A. K., Kumar, Vinay, Sharma, V., Singh, Fouran, Lochab, S. P., Ntwaeaborwa, O. M., Swart, H. C.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-09-2014; Springer Nature B.V
• Subjects: Absorption spectra; Blue shift; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Crystallography and Scattering Methods; Direct reduction; Heavy ions; Ion irradiation; Luminescence; Materials Science; Mathematical analysis; Optical properties; Phase transitions; Phosphors; Photoluminescence; Polymer Sciences; Reflectance; Solid Mechanics; White light; X ray powder diffraction; Diffuse Reflectance Spectrum; White Light Emission; Dysprosium Oxide; Color Center; Magnetic Dipole Transition
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-014-8367-0

The effect of 120 MeVAg
9+
ion irradiation on the structural, optical and luminescence properties of NaSr
1-x
BO
3
:xDy
3+
(x = 0.5–2.5 mol%) phosphor synthesized by the conventional solid state reaction route is reported. The samples were irradiated with Ag
9+
swift heavy ions (SHIs) using fluences of 1 × 10
12
, 5 × 10
12
and 1 × 10
13
ions cm
−2
. The unirradiated as well as irradiated samples were characterized by powder X-ray diffraction (PXRD), diffuse reflectance (DR) and photoluminescence techniques. PXRD confirms no change in the phase after irradiation except that loss of crystallinity had been observed which may be due to the fragmentation caused by the SHI. A blue shift in the absorption band of the DR was observed, resulting in an increase in the band gap from 5.61 eV to 5.77 eV, after ion irradiation. An increase in photoluminescence intensity (excited at 385 nm) was observed with increased ion fluences. The ratio of the blue to yellow emission peaks (I
483
/I
577
) was calculated and found to be varying with ion fluences suggesting that the white light can be achieved by tailoring this yellow to blue ratio. The Commission Internationale de l’Eclairage coordinates were calculated and found to move toward the white region after irradiation.